{"id":30025,"date":"2026-07-14T14:01:51","date_gmt":"2026-07-14T06:01:51","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=30025"},"modified":"2026-07-14T14:36:51","modified_gmt":"2026-07-14T06:36:51","slug":"1pn-spd-vs-2p-spd-buyer-selection-guide-leeyee","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/","title":{"rendered":"1P+N SPD vs 2P SPD: Buyer Selection Guide | LEEYEE"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"30025\" class=\"elementor elementor-30025\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a6f0b45 e-flex e-con-boxed e-con e-parent\" data-id=\"a6f0b45\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-aef2d94 elementor-widget elementor-widget-html\" data-id=\"aef2d94\" data-element_type=\"widget\" data-e-type=\"widget\" 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li::before {\r\n  position: absolute;\r\n  top: 17px;\r\n  left: 16px;\r\n  display: grid;\r\n  width: 22px;\r\n  height: 22px;\r\n  place-items: center;\r\n  border-radius: 50%;\r\n  background: var(--ly-blue);\r\n  color: var(--ly-white);\r\n  content: \"\u2713\";\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n}\r\n\r\n.ly-1pn2p-page .ly-checklist b {\r\n  display: block;\r\n  margin-bottom: 3px;\r\n  font-size: 16px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-checklist span {\r\n  display: block;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.5;\r\n}\r\n\r\n\/* =========================================================\r\n   LEEYEE CONFIRMATION\r\n   ========================================================= *\/\r\n\r\n.ly-1pn2p-page .ly-confirm-box {\r\n  margin: 29px 0 37px;\r\n  padding: 28px;\r\n  border: 1px solid #b9cee3;\r\n  border-radius: 13px;\r\n  background: linear-gradient(135deg, #f3f8fd 0%, #ffffff 100%);\r\n  box-shadow: var(--ly-shadow);\r\n}\r\n\r\n.ly-1pn2p-page .ly-confirm-box h2 {\r\n  margin-top: 0;\r\n}\r\n\r\n.ly-1pn2p-page .ly-confirm-grid {\r\n  grid-template-columns: repeat(3, minmax(0, 1fr));\r\n  margin-top: 21px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-confirm-item {\r\n  padding: 18px;\r\n  border: 1px solid #d1deeb;\r\n  border-radius: 9px;\r\n  background: var(--ly-white);\r\n}\r\n\r\n.ly-1pn2p-page .ly-confirm-item b {\r\n  display: block;\r\n  margin-bottom: 5px;\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n.ly-1pn2p-page .ly-confirm-item span {\r\n  display: block;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.5;\r\n}\r\n\r\n\/* =========================================================\r\n   OEM ORDER LIST\r\n   ========================================================= *\/\r\n\r\n.ly-1pn2p-page .ly-order-list {\r\n  margin: 22px 0 31px;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: ly-order;\r\n}\r\n\r\n.ly-1pn2p-page .ly-order-list li {\r\n  position: relative;\r\n  margin: 0;\r\n  padding: 15px 16px 15px 56px;\r\n  border-bottom: 1px solid var(--ly-line);\r\n  counter-increment: ly-order;\r\n}\r\n\r\n.ly-1pn2p-page .ly-order-list li:first-child {\r\n  border-top: 1px solid var(--ly-line);\r\n}\r\n\r\n.ly-1pn2p-page .ly-order-list li::before {\r\n  position: absolute;\r\n  top: 15px;\r\n  left: 12px;\r\n  display: grid;\r\n  width: 28px;\r\n  height: 28px;\r\n  place-items: center;\r\n  border-radius: 6px;\r\n  background: var(--ly-blue-soft);\r\n  color: var(--ly-blue-dark);\r\n  content: counter(ly-order);\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n}\r\n\r\n.ly-1pn2p-page .ly-order-list b {\r\n  display: block;\r\n  margin-bottom: 3px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-order-list span {\r\n  display: block;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.52;\r\n}\r\n\r\n\/* =========================================================\r\n   RFQ\r\n   ========================================================= *\/\r\n\r\n.ly-1pn2p-page .ly-rfq {\r\n  margin: 26px 0 33px;\r\n  padding: 26px;\r\n  border: 1px solid #bccfe2;\r\n  border-radius: 12px;\r\n  background: #f7faff;\r\n}\r\n\r\n.ly-1pn2p-page .ly-rfq h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n.ly-1pn2p-page .ly-rfq pre {\r\n  margin: 15px 0 0;\r\n  padding: 21px;\r\n  overflow-x: auto;\r\n  border-radius: 9px;\r\n  background: #142536;\r\n  color: #eaf3fc;\r\n  font-family: Consolas, Monaco, monospace;\r\n  font-size: 14px;\r\n  line-height: 1.68;\r\n  white-space: pre-wrap;\r\n}\r\n\r\n\/* =========================================================\r\n   COMMON MISTAKES\r\n   ========================================================= *\/\r\n\r\n.ly-1pn2p-page .ly-mistakes {\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  margin: 22px 0 31px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-mistake {\r\n  padding: 20px 21px;\r\n  border: 1px solid #edd0cc;\r\n  border-radius: 10px;\r\n  background: #fffafa;\r\n}\r\n\r\n.ly-1pn2p-page .ly-mistake b {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: #8e3232;\r\n}\r\n\r\n.ly-1pn2p-page .ly-mistake p {\r\n  margin: 0;\r\n  color: #5d5555;\r\n  font-size: 15px;\r\n}\r\n\r\n\/* =========================================================\r\n   RELATED CONTENT\r\n   ========================================================= *\/\r\n\r\n.ly-1pn2p-page .ly-related {\r\n  margin: 34px 0;\r\n  padding: 24px 26px;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 11px;\r\n  background: #fbfcfe;\r\n}\r\n\r\n.ly-1pn2p-page .ly-related h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n.ly-1pn2p-page .ly-related-links {\r\n  display: flex;\r\n  flex-wrap: wrap;\r\n  gap: 10px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-related-links a {\r\n  display: inline-flex;\r\n  align-items: center;\r\n  min-height: 42px;\r\n  padding: 8px 13px;\r\n  border: 1px solid #b8cce0;\r\n  border-radius: 7px;\r\n  background: var(--ly-white);\r\n  color: var(--ly-blue-dark);\r\n  font-size: 14px;\r\n  font-weight: 700;\r\n  line-height: 1.35;\r\n  text-decoration: none;\r\n}\r\n\r\n.ly-1pn2p-page .ly-related-links a:hover {\r\n  border-color: var(--ly-blue);\r\n  background: var(--ly-blue-soft);\r\n}\r\n\r\n\/* =========================================================\r\n   FAQ\r\n   ========================================================= *\/\r\n\r\n.ly-1pn2p-page .ly-faq {\r\n  margin-top: 22px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-faq details {\r\n  margin: 11px 0;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 9px;\r\n  background: var(--ly-white);\r\n}\r\n\r\n.ly-1pn2p-page .ly-faq summary {\r\n  position: relative;\r\n  padding: 18px 52px 18px 19px;\r\n  color: #21374b;\r\n  cursor: pointer;\r\n  font-weight: 750;\r\n  line-height: 1.45;\r\n  list-style: none;\r\n}\r\n\r\n.ly-1pn2p-page .ly-faq summary::-webkit-details-marker {\r\n  display: none;\r\n}\r\n\r\n.ly-1pn2p-page .ly-faq summary::after {\r\n  position: absolute;\r\n  top: 50%;\r\n  right: 19px;\r\n  color: var(--ly-blue);\r\n  content: \"+\";\r\n  font-size: 25px;\r\n  font-weight: 400;\r\n  transform: translateY(-50%);\r\n}\r\n\r\n.ly-1pn2p-page .ly-faq details[open] summary::after {\r\n  content: \"\u2212\";\r\n}\r\n\r\n.ly-1pn2p-page .ly-faq-answer {\r\n  padding: 0 19px 19px;\r\n  color: #4b5c6c;\r\n}\r\n\r\n.ly-1pn2p-page .ly-faq-answer p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n\/* =========================================================\r\n   CTA\r\n   ========================================================= *\/\r\n\r\n.ly-1pn2p-page .ly-cta {\r\n  margin: 54px 0 42px;\r\n  padding: 32px;\r\n  border-radius: 14px;\r\n  background: linear-gradient(135deg, #003d81 0%, #0058ae 100%);\r\n  color: var(--ly-white);\r\n  box-shadow: 0 16px 34px rgba(0, 72, 152, 0.18);\r\n}\r\n\r\n.ly-1pn2p-page .ly-cta-grid {\r\n  display: grid;\r\n  grid-template-columns: minmax(0, 1fr) auto;\r\n  gap: 28px;\r\n  align-items: center;\r\n}\r\n\r\n.ly-1pn2p-page .ly-cta h2 {\r\n  margin: 0 0 10px;\r\n  color: var(--ly-white);\r\n  font-size: 28px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-cta p {\r\n  max-width: 770px;\r\n  margin: 0;\r\n  color: #e6f1fc;\r\n}\r\n\r\n.ly-1pn2p-page .ly-btn,\r\n.ly-1pn2p-page .ly-btn span {\r\n  visibility: visible !important;\r\n  opacity: 1 !important;\r\n}\r\n\r\n.ly-1pn2p-page .ly-btn {\r\n  display: inline-flex !important;\r\n  min-width: 190px;\r\n  min-height: 48px;\r\n  align-items: center;\r\n  justify-content: center;\r\n  padding: 12px 20px;\r\n  border: 2px solid var(--ly-white);\r\n  border-radius: 7px;\r\n  background: var(--ly-white);\r\n  color: var(--ly-blue-dark) !important;\r\n  cursor: pointer;\r\n  font-family: Arial, Helvetica, sans-serif;\r\n  font-size: 15px;\r\n  font-weight: 750;\r\n  line-height: 1.2;\r\n  text-align: center;\r\n  text-decoration: none !important;\r\n  white-space: nowrap;\r\n}\r\n\r\n.ly-1pn2p-page .ly-btn span {\r\n  display: inline-block !important;\r\n  color: var(--ly-blue-dark) !important;\r\n  font-size: inherit !important;\r\n  font-weight: inherit !important;\r\n  line-height: 1.2 !important;\r\n  white-space: nowrap;\r\n}\r\n\r\n.ly-1pn2p-page .ly-btn:hover {\r\n  border-color: #d7e9fa;\r\n  background: #dfefff;\r\n  color: var(--ly-blue-dark) !important;\r\n  transform: translateY(-1px);\r\n}\r\n\r\n.ly-1pn2p-page .ly-btn:hover span {\r\n  color: var(--ly-blue-dark) !important;\r\n}\r\n\r\n\/* =========================================================\r\n   SOURCES\r\n   ========================================================= *\/\r\n\r\n.ly-1pn2p-page .ly-sources {\r\n  margin-top: 43px;\r\n  padding-top: 31px;\r\n  border-top: 1px solid var(--ly-line);\r\n}\r\n\r\n.ly-1pn2p-page .ly-sources h2 {\r\n  margin-top: 0;\r\n  font-size: 27px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-sources ol {\r\n  padding-left: 22px;\r\n}\r\n\r\n.ly-1pn2p-page .ly-sources li {\r\n  margin: 11px 0;\r\n  color: #526273;\r\n  font-size: 14px;\r\n  line-height: 1.58;\r\n}\r\n\r\n.ly-1pn2p-page .ly-disclaimer {\r\n  margin-top: 22px;\r\n  padding: 15px 17px;\r\n  border-left: 4px solid #97aabc;\r\n  background: #f6f8fa;\r\n  color: #5c6874;\r\n  font-size: 13px;\r\n  line-height: 1.55;\r\n}\r\n\r\n\/* =========================================================\r\n   DESKTOP \u2014 1440\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 1440px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    width: min(100%, 1160px);\r\n    padding-right: 25px;\r\n    padding-left: 25px;\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    font-size: 33px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-lead {\r\n    font-size: 19px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   DESKTOP \u2014 1366\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 1366px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    width: min(100%, 1120px);\r\n  }\r\n\r\n  .ly-1pn2p-page {\r\n    font-size: 16.5px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-definition-card h2 {\r\n    font-size: 26px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   DESKTOP \u2014 1280\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 1280px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    width: min(100%, 1060px);\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    margin-top: 52px;\r\n    font-size: 31px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-cta {\r\n    padding: 29px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   TABLET \u2014 1024\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 1024px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    width: 100%;\r\n    padding: 16px 29px 66px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-key-grid {\r\n    grid-template-columns: repeat(3, minmax(0, 1fr));\r\n    gap: 14px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-key-card {\r\n    padding: 19px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-confirm-grid {\r\n    grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-article-figure {\r\n    margin-top: 26px;\r\n    margin-bottom: 31px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   TABLET \u2014 912\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 912px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    padding-right: 26px;\r\n    padding-left: 26px;\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    font-size: 30px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-key-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-key-card {\r\n    display: grid;\r\n    grid-template-columns: 190px minmax(0, 1fr);\r\n    gap: 13px;\r\n    align-items: start;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-key-card b {\r\n    margin-bottom: 0;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   TABLET \u2014 820\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 820px) {\r\n  .ly-1pn2p-page {\r\n    font-size: 16px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-lead {\r\n    font-size: 18px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-toc-grid,\r\n  .ly-1pn2p-page .ly-definition-grid,\r\n  .ly-1pn2p-page .ly-system-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-toc-grid {\r\n    gap: 3px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-cta-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-btn {\r\n    width: fit-content;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   TABLET \u2014 768\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 768px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    padding: 14px 22px 60px;\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    margin-top: 46px;\r\n    font-size: 28px;\r\n  }\r\n\r\n  .ly-1pn2p-page h3 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-quick-answer {\r\n    padding: 25px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-card-grid,\r\n  .ly-1pn2p-page .ly-checklist,\r\n  .ly-1pn2p-page .ly-mistakes {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-rfq {\r\n    padding: 22px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-image-frame {\r\n    border-radius: 10px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 600\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 600px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    padding: 10px 19px 54px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-lead {\r\n    font-size: 17px;\r\n    line-height: 1.62;\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    font-size: 26px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-quick-answer {\r\n    padding: 22px 20px;\r\n    border-left-width: 5px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-quick-answer h2 {\r\n    font-size: 22px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-featured-answer {\r\n    font-size: 16.5px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-key-card {\r\n    display: block;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-key-card b {\r\n    margin-bottom: 7px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-confirm-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-article-figure {\r\n    margin-top: 22px;\r\n    margin-bottom: 27px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-article-figure figcaption {\r\n    padding-right: 4px;\r\n    padding-left: 4px;\r\n    font-size: 12.5px;\r\n    text-align: left;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-cta {\r\n    margin-top: 45px;\r\n    padding: 25px 22px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-cta h2 {\r\n    font-size: 25px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-btn {\r\n    width: 100%;\r\n    min-width: 0;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 540\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 540px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    padding-right: 17px;\r\n    padding-left: 17px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-toc,\r\n  .ly-1pn2p-page .ly-related {\r\n    padding: 20px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-system-card,\r\n  .ly-1pn2p-page .ly-info-card,\r\n  .ly-1pn2p-page .ly-definition-card {\r\n    padding: 21px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-definition-card h2 {\r\n    font-size: 24px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-rfq pre {\r\n    padding: 17px;\r\n    font-size: 13px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-image-note {\r\n    padding: 12px 14px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 480\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 480px) {\r\n  .ly-1pn2p-page {\r\n    font-size: 15.5px;\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    font-size: 25px;\r\n  }\r\n\r\n  .ly-1pn2p-page h3 {\r\n    font-size: 20px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-kicker {\r\n    font-size: 12px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-quick-answer {\r\n    margin-top: 22px;\r\n    padding: 20px 17px;\r\n  }\r\n\r\n  .ly-1pn2p-page th,\r\n  .ly-1pn2p-page td {\r\n    padding: 13px 14px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-warning,\r\n  .ly-1pn2p-page .ly-note,\r\n  .ly-1pn2p-page .ly-success {\r\n    padding: 17px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-image-frame {\r\n    border-radius: 8px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-confirm-box {\r\n    padding: 22px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 430\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 430px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    padding-right: 15px;\r\n    padding-left: 15px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-lead {\r\n    font-size: 16.5px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-checklist li {\r\n    padding-right: 14px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-related-links {\r\n    display: grid;\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-related-links a {\r\n    width: 100%;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-order-list li {\r\n    padding-right: 10px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 414\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 414px) {\r\n  .ly-1pn2p-page h2 {\r\n    font-size: 24px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-quick-answer h2 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-toc {\r\n    padding: 18px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-system-card,\r\n  .ly-1pn2p-page .ly-info-card,\r\n  .ly-1pn2p-page .ly-definition-card {\r\n    padding: 19px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-cta {\r\n    padding: 23px 19px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 390\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 390px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    padding-right: 14px;\r\n    padding-left: 14px;\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    line-height: 1.25;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-key-card {\r\n    padding: 18px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-rfq {\r\n    padding: 18px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 375\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 375px) {\r\n  .ly-1pn2p-page {\r\n    font-size: 15px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-lead {\r\n    font-size: 16px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-quick-answer {\r\n    padding-right: 15px;\r\n    padding-left: 15px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-faq summary {\r\n    padding-left: 16px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-faq-answer {\r\n    padding-right: 16px;\r\n    padding-left: 16px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 360\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 360px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    padding-right: 12px;\r\n    padding-left: 12px;\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    font-size: 23px;\r\n  }\r\n\r\n  .ly-1pn2p-page h3 {\r\n    font-size: 19px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-toc,\r\n  .ly-1pn2p-page .ly-related,\r\n  .ly-1pn2p-page .ly-system-card {\r\n    padding-right: 16px;\r\n    padding-left: 16px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-btn {\r\n    padding-right: 13px;\r\n    padding-left: 13px;\r\n    font-size: 14px;\r\n  }\r\n}\r\n\r\n\/* =========================================================\r\n   MOBILE \u2014 320\r\n   ========================================================= *\/\r\n\r\n@media (max-width: 320px) {\r\n  .ly-1pn2p-page .ly-container {\r\n    padding-right: 10px;\r\n    padding-left: 10px;\r\n  }\r\n\r\n  .ly-1pn2p-page {\r\n    font-size: 14.5px;\r\n  }\r\n\r\n  .ly-1pn2p-page h2 {\r\n    font-size: 22px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-lead {\r\n    font-size: 15.5px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-quick-answer,\r\n  .ly-1pn2p-page .ly-cta {\r\n    border-radius: 10px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-rfq pre {\r\n    font-size: 12px;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-btn span {\r\n    white-space: normal;\r\n  }\r\n\r\n  .ly-1pn2p-page .ly-article-figure figcaption {\r\n    font-size: 12px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"ly-1pn2p-page\">\r\n  <div class=\"ly-container\">\r\n\r\n    <div class=\"ly-kicker\">\r\n      Single-Phase SPD Buyer &amp; OEM Selection Guide\r\n    <\/div>\r\n\r\n    <p class=\"ly-lead\">\r\n      The difference between a <strong>1P+N SPD and a 2P SPD<\/strong> cannot always\r\n      be determined from the product name. For a correct single-phase distribution-board\r\n      order, buyers must verify the real protection topology, earthing system, protection\r\n      modes, base and cartridge combination, label and certificate scope.\r\n    <\/p>\r\n\r\n    <section class=\"ly-quick-answer\" aria-labelledby=\"quick-answer\">\r\n      <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#quick-answer-1pn-spd-or-2p-spd\" >Quick Answer: 1P+N SPD or 2P SPD?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#what-is-a-1pn-spd\" >What Is a 1P+N SPD?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#what-is-a-2p-spd\" >What Is a 2P SPD?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#separate-the-product-name-from-the-protection-topology\" >Separate the Product Name from the Protection Topology<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#11-spd-vs-20-spd-internal-protection-paths\" >1+1 SPD vs 2+0 SPD: Internal Protection Paths<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#published-example-why-%e2%80%9c2p%e2%80%9d-does-not-always-mean-20\" >Published Example: Why \u201c2P\u201d Does Not Always Mean 2+0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#1pn-spd-vs-2p-spd-buyer-comparison\" >1P+N SPD vs 2P SPD: Buyer Comparison<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#why-the-protection-topology-matters\" >Why the Protection Topology Matters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#which-spd-should-you-choose-for-tt-or-tn-s\" >Which SPD Should You Choose for TT or TN-S?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#tt-vs-tn-s-single-phase-spd-selection-flow\" >TT vs TN-S Single-Phase SPD Selection Flow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#which-version-is-better-for-distributor-stocking\" >Which Version Is Better for Distributor Stocking?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#what-leeyee-confirms-before-quotation\" >What LEEYEE Confirms Before Quotation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#oem-and-bulk-order-checklist\" >OEM and Bulk-Order Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#rfq-template-for-a-single-phase-spd\" >RFQ Template for a Single-Phase SPD<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#four-common-purchasing-mistakes\" >Four Common Purchasing Mistakes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#need-to-confirm-a-single-phase-spd-before-ordering\" >Need to Confirm a Single-Phase SPD Before Ordering?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/#technical-references\" >Technical References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer-1pn-spd-or-2p-spd\"><\/span>\r\n        Quick Answer: 1P+N SPD or 2P SPD?\r\n      <span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p class=\"ly-featured-answer\">\r\n        A 1P+N SPD and a 2P SPD are not always electrically different. The names may\r\n        describe the product format, while the real circuit may be 1+1\/CT2 or 2+0\/CT1.\r\n        For TT or TN-S boards, verify the circuit diagram, protection modes and approved\r\n        earthing-system scope before ordering.\r\n      <\/p>\r\n\r\n      <p class=\"ly-answer-detail\">\r\n        A verified 1+1\/CT2 SPD is a common purchasing direction for many 230\/240 V\r\n        single-phase TT boards and for TN-S projects requiring L\u2013N plus N\u2013PE protection.\r\n        A verified 2+0\/CT1 product may also be appropriate where the project specifically\r\n        requires separate L\u2013PE and N\u2013PE protection paths.\r\n      <\/p>\r\n    <\/section>\r\n\r\n    <div class=\"ly-intent-note\">\r\n      <strong>This guide compares surge protective devices, not circuit breakers.<\/strong>\r\n\r\n      <p>\r\n        The terms 1P+N and 2P are also used for MCBs, RCBOs, RCDs and isolators.\r\n        SPD terminology relates to surge protection paths and product construction,\r\n        not overcurrent protection or circuit-breaker switching logic.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <nav class=\"ly-toc\" aria-label=\"Page contents\">\r\n      <div class=\"ly-toc-title\">On this page<\/div>\r\n\r\n      <div class=\"ly-toc-grid\">\r\n        <a href=\"#definitions\">What 1P+N and 2P mean<\/a>\r\n        <a href=\"#terminology\">1+1\/CT2 vs 2+0\/CT1 terminology<\/a>\r\n        <a href=\"#topology\">Internal protection paths<\/a>\r\n        <a href=\"#published-example\">Published industry naming example<\/a>\r\n        <a href=\"#comparison\">Complete buyer comparison<\/a>\r\n        <a href=\"#tt-tns\">TT and TN-S selection<\/a>\r\n        <a href=\"#selection-flow\">Buyer decision process<\/a>\r\n        <a href=\"#stocking\">Distributor stocking strategy<\/a>\r\n        <a href=\"#leeyee-confirmation\">What LEEYEE confirms<\/a>\r\n        <a href=\"#oem-checklist\">OEM ordering checklist<\/a>\r\n        <a href=\"#rfq\">RFQ specification template<\/a>\r\n        <a href=\"#faq\">Frequently asked questions<\/a>\r\n      <\/div>\r\n    <\/nav>\r\n\r\n    <div class=\"ly-key-grid\">\r\n      <div class=\"ly-key-card\">\r\n        <b>Product name<\/b>\r\n\r\n        <p>\r\n          1P+N or 2P may describe poles, modules or the commercial format shown\r\n          in the catalogue.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-key-card\">\r\n        <b>Electrical topology<\/b>\r\n\r\n        <p>\r\n          1+1\/CT2 or 2+0\/CT1 identifies the actual surge protection paths.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-key-card\">\r\n        <b>Purchasing decision<\/b>\r\n\r\n        <p>\r\n          The circuit diagram, earthing system and rated protection modes must agree.\r\n        <\/p>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <section id=\"definitions\">\r\n      <div class=\"ly-definition-grid\">\r\n\r\n        <div class=\"ly-definition-card\">\r\n          <span class=\"ly-definition-tag\">Definition<\/span>\r\n\r\n          <h2><span class=\"ez-toc-section\" id=\"what-is-a-1pn-spd\"><\/span>What Is a 1P+N SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <p>\r\n            A 1P+N SPD is a single-phase surge protective device intended for systems\r\n            containing a phase conductor, neutral and protective earth. The description\r\n            normally indicates that the product is designed around the phase and neutral\r\n            conductors rather than two unrelated phases.\r\n          <\/p>\r\n\r\n          <p>\r\n            Many products sold as 1P+N use a <strong>1+1 or CT2 circuit<\/strong>:\r\n            one protection path between L and N and another between N and PE.\r\n            However, the wording \u201c1P+N\u201d alone does not prove the internal component\r\n            arrangement. Buyers must still check the manufacturer's circuit diagram.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-definition-card\">\r\n          <span class=\"ly-definition-tag\">Definition<\/span>\r\n\r\n          <h2><span class=\"ez-toc-section\" id=\"what-is-a-2p-spd\"><\/span>What Is a 2P SPD?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <p>\r\n            A 2P SPD usually means a two-pole, two-module or two-position surge\r\n            protective device. Some 2P products use separate L\u2013PE and N\u2013PE protection\r\n            paths, commonly described as <strong>2+0 or CT1<\/strong>.\r\n          <\/p>\r\n\r\n          <p>\r\n            Other products carrying \u201c2P\u201d in the model name use a 1+1 circuit instead.\r\n            Therefore, 2P does not automatically mean 2+0. It also does not mean\r\n            \u201cType 2\u201d; pole count and SPD test classification are different specifications.\r\n          <\/p>\r\n        <\/div>\r\n\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"terminology\">\r\n      <h2><span class=\"ez-toc-section\" id=\"separate-the-product-name-from-the-protection-topology\"><\/span>Separate the Product Name from the Protection Topology<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        Catalogue terminology varies between manufacturers. Two products may both occupy\r\n        two DIN modules and look similar while using different internal circuits.\r\n        Conversely, products called 1P+N and 2P may use the same 1+1 protection concept.\r\n      <\/p>\r\n\r\n      <div class=\"ly-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Term<\/th>\r\n              <th>What it usually describes<\/th>\r\n              <th>What it does not prove<\/th>\r\n              <th>Required buyer check<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n\r\n          <tbody>\r\n            <tr>\r\n              <td><strong>1P+N SPD<\/strong><\/td>\r\n              <td>A phase-plus-neutral single-phase product format<\/td>\r\n              <td>The exact internal protection circuit<\/td>\r\n              <td>Request the basic circuit diagram<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>2P SPD<\/strong><\/td>\r\n              <td>Two poles, modules or product positions<\/td>\r\n              <td>That the product is necessarily 2+0<\/td>\r\n              <td>Confirm every declared protection mode<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>1+1 \/ CT2<\/strong><\/td>\r\n              <td>L\u2013N protection followed by N\u2013PE protection<\/td>\r\n              <td>The Type, Uc, Up or discharge-current ratings<\/td>\r\n              <td>Check ratings for both protection paths<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>2+0 \/ CT1<\/strong><\/td>\r\n              <td>L and N independently protected toward PE<\/td>\r\n              <td>Suitability for every TT or TN installation<\/td>\r\n              <td>Check system and installation-position approval<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>Type 2 SPD<\/strong><\/td>\r\n              <td>An SPD test classification<\/td>\r\n              <td>The number of poles or internal topology<\/td>\r\n              <td>Keep Type classification separate from 2P<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n\r\n      <div class=\"ly-warning\">\r\n        <strong>Do not select a single-phase SPD from the front label alone.<\/strong>\r\n\r\n        <p>\r\n          Ask the supplier to state whether the complete assembly is 1+1\/CT2 or\r\n          2+0\/CT1 and to identify the L\u2013N, L\u2013PE and N\u2013PE protection modes.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"topology\">\r\n      <h2><span class=\"ez-toc-section\" id=\"11-spd-vs-20-spd-internal-protection-paths\"><\/span>1+1 SPD vs 2+0 SPD: Internal Protection Paths<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The internal topology determines how surge current is diverted. It is more\r\n        important to engineering selection than the number of modules visible from\r\n        the front of the product.\r\n      <\/p>\r\n\r\n      <figure class=\"ly-article-figure\">\r\n        <div class=\"ly-image-frame\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/1pn-vs-2p-spd-protection-topology-comparison.webp\"\r\n            alt=\"1P+N 1+1 CT2 vs 2P 2+0 CT1 SPD protection topology comparison for single-phase distribution boards\"\r\n            width=\"1600\"\r\n            height=\"900\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          >\r\n        <\/div>\r\n\r\n        <figcaption>\r\n          Comparison of 1+1\/CT2 and 2+0\/CT1 protection paths. The descriptions\r\n          1P+N and 2P do not always reveal which circuit is inside the SPD.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <div class=\"ly-image-note\">\r\n        This image explains the protection concept. It is not a terminal-by-terminal\r\n        installation diagram. Use the selected manufacturer's official wiring\r\n        instructions for installation.\r\n      <\/div>\r\n\r\n      <div class=\"ly-card-grid\">\r\n        <div class=\"ly-info-card\">\r\n          <h3>1+1 \/ CT2 protection<\/h3>\r\n\r\n          <p>\r\n            A typical 1+1 design contains a voltage-limiting element between L and N\r\n            and a switching element such as a GDT or spark gap between N and PE.\r\n            The exact component technologies must be confirmed for the selected model.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-info-card\">\r\n          <h3>2+0 \/ CT1 protection<\/h3>\r\n\r\n          <p>\r\n            A typical 2+0 design provides separate surge paths from L to PE and from\r\n            N to PE. Component technology, leakage current and TOV behaviour depend\r\n            on the actual design and cannot be inferred from the word \u201c2P\u201d.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"published-example\">\r\n      <h2><span class=\"ez-toc-section\" id=\"published-example-why-%e2%80%9c2p%e2%80%9d-does-not-always-mean-20\"><\/span>Published Example: Why \u201c2P\u201d Does Not Always Mean 2+0<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-note\">\r\n        <strong>A published manufacturer example confirms the naming difference.<\/strong>\r\n\r\n        <p>\r\n          One officially published single-phase SPD carries \u201c2P\u201d in its product\r\n          designation while the manufacturer describes its electrical arrangement\r\n          as a 1+1 configuration for TT and TN systems.\r\n        <\/p>\r\n\r\n        <p>\r\n          This example demonstrates why buyers should verify the official circuit\r\n          diagram and protection modes instead of interpreting \u201c2P\u201d as automatic\r\n          proof of a 2+0 topology.\r\n        <\/p>\r\n\r\n        <p>\r\n          <a\r\n            href=\"https:\/\/www.dehn-international.com\/store\/p\/en-DE\/F33274\/dehnguard-m-surge-arrester-?product=P33296\"\r\n            target=\"_blank\"\r\n            rel=\"nofollow noopener noreferrer\"\r\n            aria-label=\"View the third-party manufacturer reference for SPD naming terminology\"\r\n          >\r\n            View the third-party manufacturer reference\r\n          <\/a>\r\n        <\/p>\r\n\r\n        <p class=\"ly-third-party-note\">\r\n          Third-party product information is cited only to illustrate variation in\r\n          industry terminology. LEEYEE is not affiliated with, sponsored by or endorsed\r\n          by the referenced manufacturer.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"comparison\">\r\n      <h2><span class=\"ez-toc-section\" id=\"1pn-spd-vs-2p-spd-buyer-comparison\"><\/span>1P+N SPD vs 2P SPD: Buyer Comparison<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-table-wrap\">\r\n        <table>\r\n          <thead>\r\n            <tr>\r\n              <th>Comparison point<\/th>\r\n              <th>Product called 1P+N<\/th>\r\n              <th>Product called 2P<\/th>\r\n              <th>Correct purchasing action<\/th>\r\n            <\/tr>\r\n          <\/thead>\r\n\r\n          <tbody>\r\n            <tr>\r\n              <td><strong>Product naming<\/strong><\/td>\r\n              <td>Usually phase plus neutral<\/td>\r\n              <td>Usually two poles or two modules<\/td>\r\n              <td>Do not approve from naming alone<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>Possible topology<\/strong><\/td>\r\n              <td>Frequently 1+1\/CT2<\/td>\r\n              <td>May be 1+1\/CT2 or 2+0\/CT1<\/td>\r\n              <td>Request the circuit diagram<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>Protection paths<\/strong><\/td>\r\n              <td>Often L\u2013N and N\u2013PE<\/td>\r\n              <td>May be L\u2013PE and N\u2013PE or L\u2013N and N\u2013PE<\/td>\r\n              <td>Check protection modes individually<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>TT application<\/strong><\/td>\r\n              <td>Commonly selected when verified as CT2<\/td>\r\n              <td>Depends on topology and RCD position<\/td>\r\n              <td>State TT and RCD position in the RFQ<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>TN-S application<\/strong><\/td>\r\n              <td>Suitable where the approved design requires L\u2013N plus N\u2013PE<\/td>\r\n              <td>CT1 and CT2 versions may both exist<\/td>\r\n              <td>Follow the project protection-mode requirement<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>N\u2013PE component<\/strong><\/td>\r\n              <td>Frequently a GDT or spark gap in 1+1 products<\/td>\r\n              <td>Depends on the actual circuit<\/td>\r\n              <td>Confirm technology and mode rating<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>Cartridges<\/strong><\/td>\r\n              <td>Phase and N\u2013PE modules may be different<\/td>\r\n              <td>Modules may be identical or different<\/td>\r\n              <td>Verify individual spare-module codes<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>Uc and Up<\/strong><\/td>\r\n              <td>May be specified for L\u2013N and N\u2013PE<\/td>\r\n              <td>May be specified for L\u2013PE and N\u2013PE<\/td>\r\n              <td>Compare values by protection mode<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>Certificate scope<\/strong><\/td>\r\n              <td>Must cover the complete base and cartridge combination<\/td>\r\n              <td>Must cover the exact complete assembly<\/td>\r\n              <td>Match the certificate, label and BOM<\/td>\r\n            <\/tr>\r\n\r\n            <tr>\r\n              <td><strong>Main risk<\/strong><\/td>\r\n              <td>Assuming every 1P+N product has the same circuit<\/td>\r\n              <td>Assuming every 2P product is 2+0<\/td>\r\n              <td>Approve topology before mass production<\/td>\r\n            <\/tr>\r\n          <\/tbody>\r\n        <\/table>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section>\r\n      <h2><span class=\"ez-toc-section\" id=\"why-the-protection-topology-matters\"><\/span>Why the Protection Topology Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-card-grid\">\r\n        <div class=\"ly-info-card\">\r\n          <h3>L\u2013N protection<\/h3>\r\n\r\n          <p>\r\n            Most single-phase loads operate between L and N. A direct L\u2013N protection\r\n            mode can therefore be important when evaluating the voltage protection\r\n            level seen by downstream equipment.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-info-card\">\r\n          <h3>L\u2013PE and N\u2013PE protection<\/h3>\r\n\r\n          <p>\r\n            Common-mode surges must also be diverted toward the equipotential bonding\r\n            system. The complete protection level depends on the circuit and the length\r\n            and routing of the installation conductors.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-info-card\">\r\n          <h3>RCD coordination<\/h3>\r\n\r\n          <p>\r\n            In TT systems, the SPD position relative to the residual current device\r\n            affects the acceptable connection arrangement and must be included in\r\n            the selection information.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-info-card\">\r\n          <h3>Replacement control<\/h3>\r\n\r\n          <p>\r\n            The L-side module and N\u2013PE module may use different technologies and ratings.\r\n            Incorrect substitution can create a performance, service and warranty risk.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"tt-tns\">\r\n      <h2><span class=\"ez-toc-section\" id=\"which-spd-should-you-choose-for-tt-or-tn-s\"><\/span>Which SPD Should You Choose for TT or TN-S?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-system-grid\">\r\n        <div class=\"ly-system-card\">\r\n          <h3>Single-Phase TT System<\/h3>\r\n\r\n          <p>\r\n            For many 230\/240 V TT boards, especially where the SPD is installed upstream\r\n            of the main RCD, a verified <strong>1+1\/CT2 SPD<\/strong> is a common\r\n            purchasing direction.\r\n          <\/p>\r\n\r\n          <ul>\r\n            <li>Confirm L\u2013N and N\u2013PE protection modes.<\/li>\r\n            <li>Confirm the N\u2013PE switching element and its ratings.<\/li>\r\n            <li>State whether the SPD is upstream or downstream of the RCD.<\/li>\r\n            <li>Check TOV behaviour and manufacturer application instructions.<\/li>\r\n            <li>Follow the applicable national installation rules.<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n\r\n        <div class=\"ly-system-card\">\r\n          <h3>Single-Phase TN-S System<\/h3>\r\n\r\n          <p>\r\n            TN-S projects may use CT1 or CT2 products depending on the required protection\r\n            paths, installation design and manufacturer's approved application.\r\n          <\/p>\r\n\r\n          <ul>\r\n            <li>Use 1+1\/CT2 where L\u2013N plus N\u2013PE protection is required.<\/li>\r\n            <li>Use 2+0\/CT1 where L\u2013PE plus N\u2013PE protection is specified.<\/li>\r\n            <li>Do not assume that one topology is universal for every TN-S board.<\/li>\r\n            <li>Compare Uc, Up and TOV data for the actual protection modes.<\/li>\r\n            <li>Match the final choice to the project specification.<\/li>\r\n          <\/ul>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"ly-note\">\r\n        <strong>TN-C-S requires installation-point confirmation.<\/strong>\r\n\r\n        <p>\r\n          Determine whether the SPD is installed before or after PEN separation.\r\n          After separation, N and PE are separate conductors. Before separation,\r\n          a generic 1P+N or 2P description is not enough to approve the arrangement.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"selection-flow\">\r\n      <h2><span class=\"ez-toc-section\" id=\"tt-vs-tn-s-single-phase-spd-selection-flow\"><\/span>TT vs TN-S Single-Phase SPD Selection Flow<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        Use the earthing system, RCD or PEN position and real protection topology\r\n        as the decision inputs. Do not start with the number of modules shown in\r\n        a supplier's catalogue.\r\n      <\/p>\r\n\r\n      <figure class=\"ly-article-figure\">\r\n        <div class=\"ly-image-frame\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/tt-vs-tns-1pn-2p-spd-selection-flow.webp\"\r\n            alt=\"TT vs TN-S single-phase 1P+N and 2P SPD selection flow for panel builders and buyers\"\r\n            width=\"1600\"\r\n            height=\"900\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          >\r\n        <\/div>\r\n\r\n        <figcaption>\r\n          Purchasing flow for comparing 1P+N and 2P SPDs in TT, TN-S and TN-C-S\r\n          single-phase systems.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <ol class=\"ly-process\">\r\n        <li>\r\n          <b>Identify the earthing system at the SPD location.<\/b>\r\n\r\n          <span>\r\n            Confirm TT, TN-S, TN-C-S or another arrangement at the exact installation point.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Confirm the RCD or PEN position.<\/b>\r\n\r\n          <span>\r\n            State whether the SPD is upstream or downstream of the RCD and before\r\n            or after PEN separation where applicable.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Verify the real topology and protection modes.<\/b>\r\n\r\n          <span>\r\n            Confirm 1+1\/CT2 or 2+0\/CT1 and identify L\u2013N, L\u2013PE and N\u2013PE paths.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Match the ratings and order documents.<\/b>\r\n\r\n          <span>\r\n            Check Uc, Up, discharge ratings, base, cartridges, label, datasheet\r\n            and certificate model scope.\r\n          <\/span>\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <div class=\"ly-warning\">\r\n        <strong>Stop the approval process if the supplier cannot provide the circuit diagram.<\/strong>\r\n\r\n        <p>\r\n          A product label showing only 1P+N or 2P is not sufficient evidence of the\r\n          internal topology or system suitability.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"stocking\">\r\n      <h2><span class=\"ez-toc-section\" id=\"which-version-is-better-for-distributor-stocking\"><\/span>Which Version Is Better for Distributor Stocking?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        The best stock SKU is not simply the product labelled 1P+N or 2P. It is the\r\n        product with the broadest verified application range, controlled replacement\r\n        modules and documentation that matches the target markets.\r\n      <\/p>\r\n\r\n      <h3>Recommended Core-Stock Profile for Many IEC Markets<\/h3>\r\n\r\n      <ul class=\"ly-checklist\">\r\n        <li>\r\n          <b>230\/240 V application clearly declared<\/b>\r\n          <span>Nominal voltage, frequency and system scope are documented.<\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Verified 1+1\/CT2 circuit where appropriate<\/b>\r\n          <span>L\u2013N and N\u2013PE protection paths are shown in the datasheet.<\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>TT and TN-S scope stated in writing<\/b>\r\n          <span>Do not rely only on a verbal sales statement.<\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Pluggable construction<\/b>\r\n          <span>Supports replacement-module sales and easier field maintenance.<\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Separate module codes<\/b>\r\n          <span>L-side and N\u2013PE cartridges can be identified without confusion.<\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Mode-specific Uc and Up data<\/b>\r\n          <span>Buyers can compare the actual protected paths.<\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Backup protection declared<\/b>\r\n          <span>Maximum permitted fuse or circuit-breaker conditions are available.<\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Complete certificate package<\/b>\r\n          <span>The ordered base and cartridge combination is included in the scope.<\/span>\r\n        <\/li>\r\n      <\/ul>\r\n\r\n      <div class=\"ly-warning\">\r\n        <strong>Do not create one global stock SKU only because it is marked 2P.<\/strong>\r\n\r\n        <p>\r\n          Compare local mains conditions, customer terminology, earthing systems,\r\n          TOV requirements and certification expectations in every target market.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"leeyee-confirmation\" class=\"ly-confirm-box\">\r\n      <h2><span class=\"ez-toc-section\" id=\"what-leeyee-confirms-before-quotation\"><\/span>What LEEYEE Confirms Before Quotation<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        Before recommending a single-phase SPD for an OEM, distributor or panel-builder\r\n        order, the application information should be converted into one controlled\r\n        product specification.\r\n      <\/p>\r\n\r\n      <div class=\"ly-confirm-grid\">\r\n        <div class=\"ly-confirm-item\">\r\n          <b>Electrical system<\/b>\r\n          <span>Voltage, frequency, TT\/TN-S\/TN-C-S arrangement and installation point.<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-confirm-item\">\r\n          <b>Protection topology<\/b>\r\n          <span>1+1\/CT2 or 2+0\/CT1 and the required L\u2013N, L\u2013PE and N\u2013PE modes.<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-confirm-item\">\r\n          <b>Electrical ratings<\/b>\r\n          <span>SPD Type, Uc, Up, In, Imax, Iimp, TOV and backup protection as applicable.<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-confirm-item\">\r\n          <b>Mechanical combination<\/b>\r\n          <span>DIN width, base, phase cartridge, N\u2013PE cartridge and remote contact.<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-confirm-item\">\r\n          <b>Documentation match<\/b>\r\n          <span>Datasheet, circuit diagram, label and certificate use consistent models.<\/span>\r\n        <\/div>\r\n\r\n        <div class=\"ly-confirm-item\">\r\n          <b>OEM approval<\/b>\r\n          <span>Logo, label, packaging, manual and sample are approved before production.<\/span>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"oem-checklist\">\r\n      <h2><span class=\"ez-toc-section\" id=\"oem-and-bulk-order-checklist\"><\/span>OEM and Bulk-Order Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        A bulk order should not move into label approval or mass production until\r\n        the system, topology, modules and documentation have been checked against\r\n        the same complete model.\r\n      <\/p>\r\n\r\n      <figure class=\"ly-article-figure\">\r\n        <div class=\"ly-image-frame\">\r\n          <img loading=\"lazy\"\r\n            src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/07\/single-phase-spd-oem-ordering-checklist.webp\"\r\n            alt=\"1P+N and 2P single-phase SPD OEM ordering checklist for distributors and panel builders\"\r\n            width=\"1600\"\r\n            height=\"900\"\r\n            loading=\"lazy\"\r\n            decoding=\"async\"\r\n          >\r\n        <\/div>\r\n\r\n        <figcaption>\r\n          Order-confirmation checklist covering the electrical system, topology,\r\n          modules, labels, certificates and OEM packaging.\r\n        <\/figcaption>\r\n      <\/figure>\r\n\r\n      <ol class=\"ly-order-list\">\r\n        <li>\r\n          <b>System and installation point<\/b>\r\n\r\n          <span>\r\n            Confirm voltage, frequency, earthing system, RCD position and PEN separation point.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Connection scheme<\/b>\r\n\r\n          <span>\r\n            Specify 1+1\/CT2 or 2+0\/CT1 rather than only 1P+N or 2P.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Protection modes<\/b>\r\n\r\n          <span>\r\n            Identify all required L\u2013N, L\u2013PE and N\u2013PE protection paths.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>SPD classification and discharge ratings<\/b>\r\n\r\n          <span>\r\n            Confirm Type, In, Imax, Iimp and Itotal where applicable.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Uc, Up and TOV<\/b>\r\n\r\n          <span>\r\n            Check the values for the actual protection modes, not one headline value.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Short-circuit and backup protection<\/b>\r\n\r\n          <span>\r\n            Confirm ISCCR and maximum permitted upstream protection.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Base and cartridge combination<\/b>\r\n\r\n          <span>\r\n            Record exact base, L-module and N\u2013PE-module codes.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Label and remote contact<\/b>\r\n\r\n          <span>\r\n            Approve model, ratings, status indication and NO\/NC\/COM logic if required.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>Certificate and technical documents<\/b>\r\n\r\n          <span>\r\n            Match the ordered assembly to the datasheet, report and certificate scope.\r\n          <\/span>\r\n        <\/li>\r\n\r\n        <li>\r\n          <b>OEM sample and packaging approval<\/b>\r\n\r\n          <span>\r\n            Approve logo, manual, barcode, cartons and spare-module ratio before production.\r\n          <\/span>\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <div class=\"ly-note\">\r\n        <strong>Standard-edition check<\/strong>\r\n\r\n        <p>\r\n          IEC 61643-11:2025 contains the AC-specific requirements for low-voltage SPDs\r\n          and is used together with the common requirements in IEC 61643-01:2024.\r\n          Buyers should confirm the accepted standard edition and transition rules\r\n          for the destination market and certification scheme.\r\n        <\/p>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"rfq\">\r\n      <h2><span class=\"ez-toc-section\" id=\"rfq-template-for-a-single-phase-spd\"><\/span>RFQ Template for a Single-Phase SPD<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <p>\r\n        Use this format to avoid receiving quotations for products that look similar\r\n        but use different circuits or module combinations.\r\n      <\/p>\r\n\r\n      <div class=\"ly-rfq\">\r\n        <h3>Copyable Buyer Specification<\/h3>\r\n\r\n        <pre>Application: Single-phase AC distribution board\r\nNominal system voltage: ______ V AC\r\nFrequency: 50 \/ 60 Hz\r\nEarthing system at SPD location: TT \/ TN-S \/ TN-C-S \/ Other\r\nSPD position: Upstream \/ downstream of RCD\r\nPEN position, if applicable: Before \/ after separation\r\nRequired topology: 1+1 CT2 \/ 2+0 CT1\r\nRequired protection modes: L-N \/ L-PE \/ N-PE\r\nSPD classification: Type 2 \/ Type 1+2\r\nUc by protection mode: ____________________\r\nUp by protection mode: ____________________\r\nIn: ______ kA\r\nImax: ______ kA\r\nIimp or Itotal, if applicable: ______ kA\r\nTOV requirement: _________________________\r\nISCCR: ______ kA\r\nMaximum backup protection: _______________\r\nConstruction: Pluggable \/ fixed\r\nDIN width: ______ modules \/ ______ mm\r\nBase model: ______________________________\r\nL module model: __________________________\r\nN-PE module model: _______________________\r\nRemote contact: Required \/ not required\r\nRequired certificate or standard: _________\r\nOEM label requirements: __________________\r\nPackaging requirements: __________________\r\nOrder quantity: __________________________<\/pre>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"mistakes\">\r\n      <h2><span class=\"ez-toc-section\" id=\"four-common-purchasing-mistakes\"><\/span>Four Common Purchasing Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-mistakes\">\r\n        <div class=\"ly-mistake\">\r\n          <b>Assuming 2P always means 2+0<\/b>\r\n\r\n          <p>\r\n            A product with 2P in its model name may still use a 1+1 circuit.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mistake\">\r\n          <b>Applying circuit-breaker logic to an SPD<\/b>\r\n\r\n          <p>\r\n            SPD protection paths are not the same as MCB switching or overcurrent poles.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mistake\">\r\n          <b>Ignoring the RCD or PEN position<\/b>\r\n\r\n          <p>\r\n            TT and TN-C-S selection cannot be completed without the installation point.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <div class=\"ly-mistake\">\r\n          <b>Checking only the headline Imax<\/b>\r\n\r\n          <p>\r\n            A high Imax cannot correct the wrong topology, Uc, Up, TOV or certificate scope.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-related\">\r\n      <h3>Related Single-Phase SPD Guides<\/h3>\r\n\r\n      <div class=\"ly-related-links\">\r\n        <a\r\n          href=\"https:\/\/www.cnspd.com\/single-phase-spd-wiring-diagram\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          Single Phase SPD Wiring Diagram\r\n        <\/a>\r\n\r\n        <a\r\n          href=\"https:\/\/www.cnspd.com\/tt-system-spd\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          TT System SPD Selection\r\n        <\/a>\r\n\r\n        <a\r\n          href=\"https:\/\/www.cnspd.com\/spd-uc-selection-guide\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          SPD Uc Selection Guide\r\n        <\/a>\r\n\r\n        <a\r\n          href=\"https:\/\/www.cnspd.com\/spd-up-voltage-protection-level\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          SPD Up Protection Level\r\n        <\/a>\r\n\r\n        <a\r\n          href=\"https:\/\/www.cnspd.com\/spd-certificate-verification\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          Verify SPD Certificates\r\n        <\/a>\r\n\r\n        <a\r\n          href=\"https:\/\/www.cnspd.com\/pluggable-spd-replacement\/\"\r\n          target=\"_blank\"\r\n          rel=\"noopener\"\r\n        >\r\n          Pluggable SPD Replacement\r\n        <\/a>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section id=\"faq\">\r\n      <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <div class=\"ly-faq\">\r\n\r\n        <details>\r\n          <summary>Is a 1P+N SPD the same as a 2P SPD?<\/summary>\r\n\r\n          <div class=\"ly-faq-answer\">\r\n            <p>\r\n              Not necessarily. Both products may occupy two DIN modules, and some\r\n              manufacturers use the descriptions for similar products. The internal\r\n              circuit may be 1+1\/CT2 or 2+0\/CT1, so the circuit diagram must be checked.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Does every 1P+N SPD use a 1+1 circuit?<\/summary>\r\n\r\n          <div class=\"ly-faq-answer\">\r\n            <p>\r\n              Many 1P+N products use L\u2013N plus N\u2013PE protection, but buyers should not\r\n              assume this without checking the declared protection modes and circuit.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Does 2P mean Type 2 SPD?<\/summary>\r\n\r\n          <div class=\"ly-faq-answer\">\r\n            <p>\r\n              No. 2P normally describes the poles or product format. Type 2 is an SPD\r\n              test classification. One product may be both 2P and Type 2, but the two\r\n              terms describe different properties.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Which SPD is commonly selected for a single-phase TT board?<\/summary>\r\n\r\n          <div class=\"ly-faq-answer\">\r\n            <p>\r\n              A verified 1+1\/CT2 SPD is a common direction for many TT boards,\r\n              especially upstream of the main RCD. Final selection must follow the\r\n              actual system, project design, local rules and manufacturer instructions.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>Can a TN-S board use either 1+1 or 2+0?<\/summary>\r\n\r\n          <div class=\"ly-faq-answer\">\r\n            <p>\r\n              Both topologies may be available for TN-S applications. The correct\r\n              choice depends on whether the project requires L\u2013N plus N\u2013PE protection\r\n              or separate L\u2013PE and N\u2013PE protection, together with the approved product data.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n        <details>\r\n          <summary>What should a buyer request before approving the order?<\/summary>\r\n\r\n          <div class=\"ly-faq-answer\">\r\n            <p>\r\n              Request the official circuit diagram, mode-specific Uc and Up values,\r\n              discharge ratings, TOV data, base and cartridge codes, backup protection\r\n              instructions and certificate model scope.\r\n            <\/p>\r\n          <\/div>\r\n        <\/details>\r\n\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-cta\">\r\n      <div class=\"ly-cta-grid\">\r\n        <div>\r\n          <h2><span class=\"ez-toc-section\" id=\"need-to-confirm-a-single-phase-spd-before-ordering\"><\/span>Need to Confirm a Single-Phase SPD Before Ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n          <p>\r\n            Send LEEYEE the system voltage, earthing system, RCD or PEN position,\r\n            required topology, ratings, certificate and order quantity. We can help\r\n            confirm the base, modules, label and OEM documentation before quotation\r\n            or sample approval.\r\n          <\/p>\r\n        <\/div>\r\n\r\n        <a\r\n          href=\"javascript:void(0);\"\r\n          class=\"ly-btn leeyee-site-popup-btn\"\r\n          aria-label=\"Request a single-phase SPD quotation\"\r\n        >\r\n          <span>Request a Quote<\/span>\r\n        <\/a>\r\n      <\/div>\r\n    <\/section>\r\n\r\n    <section class=\"ly-sources\">\r\n      <h2><span class=\"ez-toc-section\" id=\"technical-references\"><\/span>Technical References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n      <ol>\r\n        <li>\r\n          IEC. IEC 61643-11:2025, requirements and test methods for low-voltage\r\n          SPDs connected to AC low-voltage power systems.\r\n\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication page\r\n          <\/a>.\r\n        <\/li>\r\n\r\n        <li>\r\n          IEC. IEC 61643-01:2024, common requirements and test methods for\r\n          low-voltage surge protective devices.\r\n\r\n          <a\r\n            href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315\"\r\n            target=\"_blank\"\r\n            rel=\"noopener noreferrer\"\r\n          >\r\n            IEC publication page\r\n          <\/a>.\r\n        <\/li>\r\n\r\n        <li>\r\n          Phoenix Contact. Lightning and Surge Protection Basics, including CT1,\r\n          CT2, x+0 and x+1 connection schemes and their application in TN and TT systems.\r\n\r\n          <a\r\n            href=\"https:\/\/www.phoenixcontact.com\/assets\/c8428ddc-254d-40b8-a2f2-540ac13bd818\/epaper\/5131327_TT_Basics_EN.pdf\"\r\n            target=\"_blank\"\r\n            rel=\"nofollow noopener noreferrer\"\r\n          >\r\n            Technical guide\r\n          <\/a>.\r\n        <\/li>\r\n\r\n        <li>\r\n          Third-party manufacturer product information cited as a published example\r\n          of a product using \u201c2P\u201d in its designation while being described as a\r\n          single-phase 1+1 configuration. Accessed for terminology comparison only.\r\n\r\n          <a\r\n            href=\"https:\/\/www.dehn-international.com\/store\/p\/en-DE\/F33274\/dehnguard-m-surge-arrester-?product=P33296\"\r\n            target=\"_blank\"\r\n            rel=\"nofollow noopener noreferrer\"\r\n          >\r\n            Official manufacturer reference\r\n          <\/a>.\r\n        <\/li>\r\n      <\/ol>\r\n\r\n      <div class=\"ly-disclaimer\">\r\n        This guide supports engineering communication and procurement. Final SPD\r\n        selection, wiring, backup protection, RCD coordination and installation must\r\n        be verified by a qualified electrical professional against the actual system,\r\n        applicable regulations and the selected manufacturer's instructions.\r\n\r\n        Third-party references are included only to support general technical or\r\n        terminology analysis. Their inclusion does not imply any commercial relationship,\r\n        authorization, endorsement or product equivalence.\r\n      <\/div>\r\n    <\/section>\r\n\r\n  <\/div>\r\n<\/article>\r\n\r\n<script>\r\ndocument.addEventListener('DOMContentLoaded', function () {\r\n  var popupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n  popupButtons.forEach(function (button) {\r\n    button.addEventListener('click', function (event) {\r\n      event.preventDefault();\r\n\r\n      var realPopupTrigger = document.querySelector(\r\n        '.w-popup.ush_popup_1 .w-popup-trigger'\r\n      );\r\n\r\n      if (realPopupTrigger) {\r\n        realPopupTrigger.click();\r\n      } else {\r\n        window.open(\r\n          'https:\/\/www.cnspd.com\/contact\/',\r\n          '_blank',\r\n          'noopener'\r\n        );\r\n      }\r\n    });\r\n  });\r\n});\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Single-Phase SPD Buyer &amp; OEM Selection Guide The difference between a 1P+N SPD and a 2P SPD cannot always be determined from the product name. For a correct single-phase distribution-board order, buyers must verify the real protection topology, earthing system, protection modes, base and cartridge combination, label and certificate scope. Quick Answer: 1P+N SPD or&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,488,422],"tags":[],"class_list":["post-30025","post","type-post","status-publish","format-standard","hentry","category-news","category-surge-protection","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>1P+N SPD vs 2P SPD: Buyer Selection Guide | LEEYEE<\/title>\n<meta name=\"description\" content=\"Compare 1P+N and 2P SPDs by 1+1 vs 2+0 topology, TT\/TN-S system, modules, labels and certificates before OEM or bulk orders.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1P+N SPD vs 2P SPD: Buyer Selection Guide | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Compare 1P+N and 2P SPDs by 1+1 vs 2+0 topology, TT\/TN-S system, modules, labels and certificates before OEM or bulk orders.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/pt\/1pn-spd-vs-2p-spd\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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