{"id":29613,"date":"2026-06-25T17:15:27","date_gmt":"2026-06-25T09:15:27","guid":{"rendered":"https:\/\/www.cnspd.com\/?page_id=29613"},"modified":"2026-06-25T17:24:29","modified_gmt":"2026-06-25T09:24:29","slug":"visual-indicator-spd-green-red-status-window-for-easy-maintenance","status":"publish","type":"page","link":"https:\/\/www.cnspd.com\/de\/visual-indicator-spd\/","title":{"rendered":"Visueller Indikator SPD: Gr\u00fcnes\/Rotes Statusfenster f\u00fcr einfache Wartung"},"content":{"rendered":"<section class=\"l-section wpb_row height_large width_full\"><div class=\"l-section-h i-cf\"><div class=\"g-cols vc_row via_grid cols_1 laptops-cols_inherit tablets-cols_inherit mobiles-cols_1 valign_top type_default stacking_default\"><div class=\"wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"w-html us_custom_f15df953\"><style>\n  :root {\n    --vi-blue: #004898;\n    --vi-blue-dark: #00366f;\n    --vi-blue-soft: #eaf3fc;\n    --vi-bg: #f6f9fd;\n    --vi-text: #172433;\n    --vi-muted: #5f6f80;\n    --vi-border: #d9e7f4;\n    --vi-green: #16a34a;\n    --vi-red: #dc2626;\n    --vi-yellow: #f59e0b;\n    --vi-white: #ffffff;\n    --vi-shadow: 0 16px 42px rgba(15, 45, 80, 0.08);\n  }\n\n  .vi-page {\n    font-family: inherit;\n    color: var(--vi-text);\n    background: #ffffff;\n    line-height: 1.65;\n  }\n\n  .vi-page * {\n    box-sizing: border-box;\n  }\n\n  .vi-wrap {\n    width: min(1180px, calc(100% - 40px));\n    margin: 0 auto;\n  }\n\n  .vi-section {\n    padding: 78px 0;\n  }\n\n  .vi-section-soft {\n    background: var(--vi-bg);\n  }\n\n  .vi-eyebrow {\n    display: inline-flex;\n    align-items: center;\n    gap: 8px;\n    padding: 7px 13px;\n    border-radius: 999px;\n    background: rgba(0, 72, 152, 0.09);\n    color: var(--vi-blue);\n    font-size: 14px;\n    font-weight: 800;\n    margin-bottom: 18px;\n  }\n\n  .vi-eyebrow:before {\n    content: \"\";\n    width: 7px;\n    height: 7px;\n    border-radius: 50%;\n    background: var(--vi-blue);\n  }\n\n  .vi-hero {\n    position: relative;\n    overflow: hidden;\n    padding: 98px 0 86px;\n    background:\n      radial-gradient(circle at 10% 18%, rgba(0,72,152,0.16), transparent 32%),\n      radial-gradient(circle at 92% 16%, rgba(22,163,74,0.12), transparent 30%),\n      linear-gradient(135deg, #f8fbff 0%, #edf5fc 52%, #ffffff 100%);\n  }\n\n  .vi-hero-grid {\n    display: grid;\n    grid-template-columns: 1.03fr 0.97fr;\n    gap: 46px;\n    align-items: center;\n  }\n\n  .vi-title {\n    margin: 0;\n    color: #102033;\n    font-size: clamp(36px, 4.2vw, 60px);\n    line-height: 1.07;\n    letter-spacing: -0.035em;\n    font-weight: 850;\n  }\n\n  .vi-subtitle {\n    margin: 22px 0 0;\n    max-width: 760px;\n    color: var(--vi-muted);\n    font-size: 19px;\n  }\n\n  .vi-hero-answer {\n    margin-top: 28px;\n    padding: 21px 23px;\n    border-left: 5px solid var(--vi-blue);\n    border-radius: 16px;\n    background: #ffffff;\n    box-shadow: var(--vi-shadow);\n    color: var(--vi-muted);\n  }\n\n  .vi-hero-answer strong {\n    color: var(--vi-blue);\n  }\n\n  .vi-actions {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 14px;\n    margin-top: 30px;\n  }\n\n  .vi-btn {\n    display: inline-flex;\n    align-items: center;\n    justify-content: center;\n    min-height: 48px;\n    padding: 13px 22px;\n    border-radius: 999px;\n    font-weight: 850;\n    text-decoration: none;\n    transition: all .22s ease;\n    border: 1px solid transparent;\n    cursor: pointer;\n  }\n\n  .vi-btn-primary {\n    color: #ffffff;\n    background: var(--vi-blue);\n    box-shadow: 0 12px 26px rgba(0,72,152,0.22);\n  }\n\n  .vi-btn-primary:hover {\n    color: #ffffff;\n    background: var(--vi-blue-dark);\n    transform: translateY(-2px);\n  }\n\n  .vi-btn-secondary {\n    color: var(--vi-blue);\n    background: #ffffff;\n    border-color: var(--vi-border);\n  }\n\n  .vi-btn-secondary:hover {\n    color: var(--vi-blue-dark);\n    border-color: var(--vi-blue);\n    transform: translateY(-2px);\n  }\n\n  .vi-real-image-card {\n    position: relative;\n    min-height: 510px;\n    padding: 30px;\n    border-radius: 30px;\n    background: rgba(255,255,255,0.9);\n    border: 1px solid rgba(217,231,244,0.95);\n    box-shadow: 0 28px 70px rgba(0,72,152,0.14);\n    overflow: hidden;\n    backdrop-filter: blur(8px);\n  }\n\n  .vi-real-image-card:before {\n    content: \"\";\n    position: absolute;\n    width: 260px;\n    height: 260px;\n    right: -90px;\n    bottom: -90px;\n    border-radius: 50%;\n    background: rgba(0,72,152,0.08);\n  }\n\n  .vi-real-image-top {\n    position: relative;\n    z-index: 2;\n    display: flex;\n    justify-content: space-between;\n    gap: 18px;\n    align-items: flex-start;\n    margin-bottom: 20px;\n  }\n\n  .vi-small-label {\n    color: var(--vi-muted);\n    font-size: 13px;\n    font-weight: 800;\n    text-transform: uppercase;\n    letter-spacing: .08em;\n  }\n\n  .vi-device-title {\n    margin: 5px 0 0;\n    font-size: 24px;\n    line-height: 1.2;\n    color: #102033;\n    font-weight: 850;\n  }\n\n  .vi-real-image-wrap {\n    position: relative;\n    z-index: 2;\n    display: flex;\n    align-items: center;\n    justify-content: center;\n    min-height: 340px;\n    padding: 18px;\n    border-radius: 24px;\n    background:\n      radial-gradient(circle at 50% 40%, rgba(0,72,152,0.08), transparent 58%),\n      linear-gradient(180deg, #ffffff 0%, #f4f8fc 100%);\n    border: 1px solid #dceaf6;\n  }\n\n  .vi-real-image-wrap img {\n    display: block;\n    width: 100%;\n    max-width: 430px;\n    height: auto;\n    object-fit: contain;\n    filter: drop-shadow(0 22px 30px rgba(20, 45, 75, 0.18));\n  }\n\n  .vi-device-caption {\n    position: relative;\n    z-index: 2;\n    max-width: 430px;\n    margin: 24px auto 0;\n    text-align: center;\n    color: var(--vi-muted);\n    font-size: 14px;\n  }\n\n  .vi-kpis {\n    display: grid;\n    grid-template-columns: repeat(4, 1fr);\n    gap: 16px;\n    margin-top: 34px;\n  }\n\n  .vi-kpi {\n    padding: 18px;\n    border-radius: 18px;\n    background: #ffffff;\n    border: 1px solid var(--vi-border);\n    box-shadow: 0 10px 28px rgba(18,36,55,0.05);\n  }\n\n  .vi-kpi b {\n    display: block;\n    color: var(--vi-blue);\n    font-size: 20px;\n    line-height: 1.2;\n  }\n\n  .vi-kpi span {\n    display: block;\n    margin-top: 7px;\n    color: var(--vi-muted);\n    font-size: 14px;\n  }\n\n  .vi-heading {\n    max-width: 870px;\n    margin-bottom: 36px;\n  }\n\n  .vi-heading h2 {\n    margin: 0;\n    color: #102033;\n    font-size: clamp(28px, 3vw, 42px);\n    line-height: 1.18;\n    letter-spacing: -0.025em;\n  }\n\n  .vi-heading p {\n    margin: 14px 0 0;\n    color: var(--vi-muted);\n    font-size: 17px;\n  }\n\n  .vi-card-grid {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 22px;\n  }\n\n  .vi-card {\n    padding: 25px;\n    border-radius: 22px;\n    background: #ffffff;\n    border: 1px solid var(--vi-border);\n    box-shadow: var(--vi-shadow);\n  }\n\n  .vi-card h3 {\n    margin: 0 0 10px;\n    color: #102033;\n    font-size: 21px;\n    line-height: 1.26;\n  }\n\n  .vi-card p {\n    margin: 0;\n    color: var(--vi-muted);\n  }\n\n  .vi-icon {\n    width: 48px;\n    height: 48px;\n    display: grid;\n    place-items: center;\n    margin-bottom: 16px;\n    border-radius: 15px;\n    background: rgba(0,72,152,0.08);\n  }\n\n  .vi-icon svg {\n    width: 25px;\n    height: 25px;\n    fill: var(--vi-blue);\n  }\n\n  .vi-table-wrap {\n    overflow-x: auto;\n    border-radius: 22px;\n    background: #ffffff;\n    border: 1px solid var(--vi-border);\n    box-shadow: var(--vi-shadow);\n  }\n\n  .vi-table {\n    width: 100%;\n    min-width: 820px;\n    border-collapse: collapse;\n  }\n\n  .vi-table th,\n  .vi-table td {\n    padding: 17px 18px;\n    text-align: left;\n    vertical-align: top;\n    border-bottom: 1px solid #e7eff7;\n  }\n\n  .vi-table th {\n    color: #ffffff;\n    background: var(--vi-blue);\n    font-size: 14px;\n    letter-spacing: .02em;\n  }\n\n  .vi-table tr:last-child td {\n    border-bottom: 0;\n  }\n\n  .vi-table td {\n    color: var(--vi-muted);\n  }\n\n  .vi-table td strong {\n    color: #102033;\n  }\n\n  .vi-pill {\n    display: inline-flex;\n    align-items: center;\n    justify-content: center;\n    padding: 5px 10px;\n    border-radius: 999px;\n    font-size: 13px;\n    font-weight: 850;\n    white-space: nowrap;\n  }\n\n  .vi-pill-green {\n    color: #0f7a36;\n    background: rgba(22,163,74,0.12);\n  }\n\n  .vi-pill-red {\n    color: #b91c1c;\n    background: rgba(220,38,38,0.12);\n  }\n\n  .vi-pill-blue {\n    color: var(--vi-blue);\n    background: rgba(0,72,152,0.09);\n  }\n\n  .vi-pill-yellow {\n    color: #9a6700;\n    background: rgba(245,158,11,0.14);\n  }\n\n  .vi-split {\n    display: grid;\n    grid-template-columns: 0.96fr 1.04fr;\n    gap: 34px;\n    align-items: stretch;\n  }\n\n  .vi-panel {\n    padding: 28px;\n    border-radius: 24px;\n    background: #ffffff;\n    border: 1px solid var(--vi-border);\n    box-shadow: var(--vi-shadow);\n  }\n\n  .vi-panel h2 {\n    margin: 0 0 18px;\n    color: #102033;\n    font-size: clamp(30px, 3vw, 44px);\n    line-height: 1.16;\n    letter-spacing: -0.025em;\n  }\n\n  .vi-panel h3 {\n    margin: 0 0 14px;\n    color: #102033;\n    font-size: 24px;\n    line-height: 1.25;\n  }\n\n  .vi-panel p {\n    color: var(--vi-muted);\n  }\n\n  .vi-list {\n    margin: 0;\n    padding: 0;\n    list-style: none;\n  }\n\n  .vi-list li {\n    position: relative;\n    padding: 12px 0 12px 31px;\n    border-bottom: 1px solid #edf3f9;\n    color: var(--vi-muted);\n  }\n\n  .vi-list li:last-child {\n    border-bottom: 0;\n  }\n\n  .vi-list li:before {\n    content: \"\";\n    position: absolute;\n    left: 0;\n    top: 19px;\n    width: 12px;\n    height: 12px;\n    border-radius: 50%;\n    background: var(--vi-blue);\n    box-shadow: 0 0 0 5px rgba(0,72,152,0.08);\n  }\n\n  .vi-principle-card {\n    position: relative;\n    overflow: hidden;\n    padding: 30px;\n    border-radius: 26px;\n    background:\n      radial-gradient(circle at 88% 12%, rgba(0,72,152,0.1), transparent 34%),\n      linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);\n    border: 1px solid var(--vi-border);\n    box-shadow: var(--vi-shadow);\n  }\n\n  .vi-principle-card h3 {\n    margin: 0 0 20px;\n    color: #102033;\n    font-size: 24px;\n    line-height: 1.25;\n  }\n\n  .vi-status-path {\n    position: relative;\n    display: grid;\n    gap: 16px;\n  }\n\n  .vi-status-path:before {\n    content: \"\";\n    position: absolute;\n    left: 27px;\n    top: 28px;\n    bottom: 28px;\n    width: 2px;\n    background: linear-gradient(180deg, var(--vi-green), var(--vi-yellow), var(--vi-red));\n    opacity: 0.55;\n  }\n\n  .vi-status-step {\n    position: relative;\n    display: grid;\n    grid-template-columns: 56px 1fr;\n    gap: 16px;\n    align-items: start;\n    padding: 18px;\n    border-radius: 20px;\n    background: #ffffff;\n    border: 1px solid #dceaf6;\n    box-shadow: 0 10px 26px rgba(18,36,55,0.05);\n  }\n\n  .vi-step-number {\n    position: relative;\n    z-index: 2;\n    width: 56px;\n    height: 56px;\n    display: grid;\n    place-items: center;\n    border-radius: 18px;\n    color: #ffffff;\n    font-size: 20px;\n    font-weight: 900;\n  }\n\n  .vi-step-number.green {\n    background: var(--vi-green);\n  }\n\n  .vi-step-number.yellow {\n    background: var(--vi-yellow);\n  }\n\n  .vi-step-number.red {\n    background: var(--vi-red);\n  }\n\n  .vi-status-step h4 {\n    margin: 0;\n    color: #102033;\n    font-size: 19px;\n    line-height: 1.28;\n  }\n\n  .vi-status-step p {\n    margin: 8px 0 0;\n    color: var(--vi-muted);\n    font-size: 15px;\n  }\n\n  .vi-status-tag {\n    display: inline-flex;\n    align-items: center;\n    margin-top: 12px;\n    padding: 5px 10px;\n    border-radius: 999px;\n    font-size: 13px;\n    font-weight: 850;\n  }\n\n  .vi-status-tag.green {\n    color: #0f7a36;\n    background: rgba(22,163,74,0.12);\n  }\n\n  .vi-status-tag.yellow {\n    color: #9a6700;\n    background: rgba(245,158,11,0.14);\n  }\n\n  .vi-status-tag.red {\n    color: #b91c1c;\n    background: rgba(220,38,38,0.12);\n  }\n\n  .vi-principle-note {\n    margin-top: 20px;\n    padding: 18px 20px;\n    border-radius: 18px;\n    background: #eef5fb;\n    border: 1px solid #d4e6f6;\n    color: #38536d;\n  }\n\n  .vi-principle-note strong {\n    color: var(--vi-blue);\n  }\n\n  .vi-process {\n    display: grid;\n    gap: 14px;\n  }\n\n  .vi-process-item {\n    display: grid;\n    grid-template-columns: 84px 1fr;\n    gap: 16px;\n    padding: 18px;\n    border-radius: 18px;\n    background: #f8fbff;\n    border: 1px solid #dceaf6;\n  }\n\n  .vi-process-item b {\n    color: var(--vi-blue);\n  }\n\n  .vi-process-item p {\n    margin: 0;\n    color: var(--vi-muted);\n  }\n\n  .vi-app-grid {\n    display: grid;\n    grid-template-columns: repeat(4, 1fr);\n    gap: 18px;\n  }\n\n  .vi-app {\n    padding: 22px;\n    border-radius: 22px;\n    background: #ffffff;\n    border: 1px solid var(--vi-border);\n    box-shadow: var(--vi-shadow);\n  }\n\n  .vi-app b {\n    display: block;\n    color: #102033;\n    font-size: 18px;\n    line-height: 1.25;\n  }\n\n  .vi-app span {\n    display: block;\n    margin-top: 8px;\n    color: var(--vi-muted);\n    font-size: 14px;\n  }\n\n  .vi-product-grid {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 22px;\n  }\n\n  .vi-product {\n    display: flex;\n    flex-direction: column;\n    min-height: 100%;\n    padding: 25px;\n    border-radius: 24px;\n    background: #ffffff;\n    border: 1px solid var(--vi-border);\n    box-shadow: var(--vi-shadow);\n  }\n\n  .vi-product-top {\n    display: flex;\n    justify-content: space-between;\n    gap: 12px;\n    align-items: flex-start;\n    margin-bottom: 14px;\n  }\n\n  .vi-product-badge {\n    padding: 5px 10px;\n    border-radius: 999px;\n    color: var(--vi-blue);\n    background: rgba(0,72,152,0.08);\n    font-size: 12px;\n    font-weight: 900;\n  }\n\n  .vi-product h3 {\n    margin: 0 0 10px;\n    color: #102033;\n    font-size: 21px;\n    line-height: 1.25;\n  }\n\n  .vi-product p {\n    margin: 0 0 18px;\n    color: var(--vi-muted);\n  }\n\n  .vi-product ul {\n    margin: 0 0 22px;\n    padding-left: 18px;\n    color: var(--vi-muted);\n  }\n\n  .vi-product a {\n    margin-top: auto;\n  }\n\n  .vi-note {\n    margin-top: 24px;\n    padding: 18px 20px;\n    border-radius: 18px;\n    background: #fff7ed;\n    border: 1px solid #fed7aa;\n    color: #7c3f00;\n  }\n\n  .vi-related {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 12px;\n    margin-top: 24px;\n  }\n\n  .vi-related a {\n    display: inline-flex;\n    align-items: center;\n    padding: 9px 13px;\n    border-radius: 999px;\n    background: #ffffff;\n    border: 1px solid var(--vi-border);\n    color: var(--vi-blue);\n    font-weight: 800;\n    text-decoration: none;\n  }\n\n  .vi-related a:hover {\n    border-color: var(--vi-blue);\n    color: var(--vi-blue-dark);\n  }\n\n  .vi-faq {\n    display: grid;\n    gap: 14px;\n  }\n\n  .vi-faq details {\n    padding: 18px 20px;\n    border-radius: 18px;\n    background: #ffffff;\n    border: 1px solid var(--vi-border);\n    box-shadow: 0 10px 28px rgba(18,36,55,0.04);\n  }\n\n  .vi-faq summary {\n    cursor: pointer;\n    color: #102033;\n    font-weight: 850;\n  }\n\n  .vi-faq p {\n    margin: 12px 0 0;\n    color: var(--vi-muted);\n  }\n\n  .vi-cta {\n    padding: 72px 0;\n    color: #ffffff;\n    background:\n      radial-gradient(circle at 14% 24%, rgba(255,255,255,0.18), transparent 34%),\n      linear-gradient(135deg, var(--vi-blue), #002d61);\n  }\n\n  .vi-cta-grid {\n    display: grid;\n    grid-template-columns: 1fr auto;\n    gap: 30px;\n    align-items: center;\n  }\n\n  .vi-cta h2 {\n    margin: 0;\n    color: #ffffff;\n    font-size: clamp(28px, 3vw, 42px);\n    line-height: 1.18;\n    letter-spacing: -0.025em;\n  }\n\n  .vi-cta p {\n    max-width: 780px;\n    margin: 12px 0 0;\n    color: rgba(255,255,255,0.82);\n  }\n\n  .vi-cta .vi-btn-secondary {\n    color: var(--vi-blue);\n    border-color: #ffffff;\n  }\n\n  @media (max-width: 980px) {\n    .vi-hero-grid,\n    .vi-split,\n    .vi-cta-grid {\n      grid-template-columns: 1fr;\n    }\n\n    .vi-kpis,\n    .vi-app-grid,\n    .vi-product-grid {\n      grid-template-columns: repeat(2, 1fr);\n    }\n\n    .vi-card-grid {\n      grid-template-columns: 1fr;\n    }\n  }\n\n  @media (max-width: 640px) {\n    .vi-wrap {\n      width: min(100% - 28px, 1180px);\n    }\n\n    .vi-hero {\n      padding: 62px 0 56px;\n    }\n\n    .vi-section {\n      padding: 54px 0;\n    }\n\n    .vi-title {\n      font-size: 34px;\n    }\n\n    .vi-subtitle {\n      font-size: 17px;\n    }\n\n    .vi-real-image-card,\n    .vi-panel,\n    .vi-principle-card,\n    .vi-card,\n    .vi-product {\n      padding: 22px;\n      border-radius: 22px;\n    }\n\n    .vi-real-image-top {\n      flex-direction: column;\n    }\n\n    .vi-real-image-wrap {\n      min-height: 260px;\n      padding: 14px;\n    }\n\n    .vi-real-image-wrap img {\n      max-width: 320px;\n    }\n\n    .vi-kpis,\n    .vi-app-grid,\n    .vi-product-grid {\n      grid-template-columns: 1fr;\n    }\n\n    .vi-actions {\n      flex-direction: column;\n    }\n\n    .vi-btn {\n      width: 100%;\n    }\n\n    .vi-process-item {\n      grid-template-columns: 1fr;\n    }\n\n    .vi-status-step {\n      grid-template-columns: 48px 1fr;\n      padding: 16px;\n    }\n\n    .vi-step-number {\n      width: 48px;\n      height: 48px;\n      border-radius: 15px;\n      font-size: 18px;\n    }\n\n    .vi-status-path:before {\n      left: 23px;\n    }\n  }\n<\/style>\n\n<div class=\"vi-page\">\n\n  <section class=\"vi-hero\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-hero-grid\">\n        <div>\n          <div class=\"vi-eyebrow\">SPD status indicator guide<\/div>\n          <h1 class=\"vi-title\">Visual Indicator SPD: Green\/Red Status Window for Easy Maintenance<\/h1>\n          <p class=\"vi-subtitle\">\n            A visual indicator SPD uses a local color window, usually green and red, to show whether the surge protective device is still in service or has reached end-of-life and needs replacement.\n          <\/p>\n\n          <div class=\"vi-hero-answer\">\n            <strong>Direct answer:<\/strong> A visual indicator is not a separate SPD type like Type 1 or Type 2. It is a monitoring feature built into many AC, DC, solar PV, distribution board, and industrial control panel SPDs. Green normally means the module is available for service. Red normally means the internal disconnector has operated and the SPD module or unit should be replaced.\n          <\/div>\n\n          <div class=\"vi-actions\">\n            <a href=\"javascript:void(0);\" class=\"vi-btn vi-btn-primary leeyee-site-popup-btn\">Request Visual Indicator SPD<\/a>\n            <a href=\"https:\/\/www.cnspd.com\/shop\/surge-protective-device\/\" class=\"vi-btn vi-btn-secondary\" target=\"_blank\" rel=\"noopener\">View SPD Product Range<\/a>\n          <\/div>\n        <\/div>\n\n        <div class=\"vi-real-image-card\" aria-label=\"Surge protective device with visual indicator\">\n          <div class=\"vi-real-image-top\">\n            <div>\n              <div class=\"vi-small-label\">Real product example<\/div>\n              <div class=\"vi-device-title\">Surge Protective Device with Visual Indicator<\/div>\n            <\/div>\n            <span class=\"vi-pill vi-pill-blue\">Green \/ Red Status<\/span>\n          <\/div>\n\n          <div class=\"vi-real-image-wrap\">\n            <img decoding=\"async\"\n              src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/Surge-protective-device-with-visual-indicator.png\"\n              alt=\"Surge protective device with visual indicator green and red status window\"\n              loading=\"eager\"\n              fetchpriority=\"high\"\n            >\n          <\/div>\n\n          <p class=\"vi-device-caption\">\n            Real SPD example with a local visual status window. Green normally indicates the module is available for service. Red normally indicates replacement is required.\n          <\/p>\n        <\/div>\n      <\/div>\n\n      <div class=\"vi-kpis\">\n        <div class=\"vi-kpi\">\n          <b>Green<\/b>\n          <span>Normally indicates the SPD module is still available for service.<\/span>\n        <\/div>\n        <div class=\"vi-kpi\">\n          <b>Red<\/b>\n          <span>Normally indicates end-of-life, disconnector operation, or service required.<\/span>\n        <\/div>\n        <div class=\"vi-kpi\">\n          <b>Remote<\/b>\n          <span>Optional dry contact for alarm output or remote monitoring.<\/span>\n        <\/div>\n        <div class=\"vi-kpi\">\n          <b>Replace<\/b>\n          <span>For modular SPDs, the failed cartridge can often be replaced.<\/span>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">What it means<\/div>\n        <h2>What Is a Visual Indicator SPD?<\/h2>\n        <p>\n          A visual indicator SPD is a surge protective device with a built-in local status window or LED. It helps electricians and maintenance teams quickly check SPD condition without opening a separate monitoring system.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-card-grid\">\n        <div class=\"vi-card\">\n          <div class=\"vi-icon\">\n            <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 2a10 10 0 1 0 10 10h-2a8 8 0 1 1-2.34-5.66L12 12l1.41 1.41 7.07-7.07A9.97 9.97 0 0 0 12 2z\"\/><\/svg>\n          <\/div>\n          <h3>It shows local SPD health<\/h3>\n          <p>\n            The indicator window is normally linked to the internal disconnector or monitoring mechanism. It gives a visible maintenance signal when the SPD module is no longer suitable for service.\n          <\/p>\n        <\/div>\n\n        <div class=\"vi-card\">\n          <div class=\"vi-icon\">\n            <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M7 2h10v2h2a1 1 0 0 1 1 1v16H4V5a1 1 0 0 1 1-1h2V2zm2 2v2h6V4H9zm-2 6v8h10v-8H7z\"\/><\/svg>\n          <\/div>\n          <h3>It is a feature, not an SPD class<\/h3>\n          <p>\n            Visual indication can appear on Type 1, Type 2, Type 1+2, AC, DC, and PV SPDs. The SPD type and rating still need to match the system voltage, installation point, and surge risk.\n          <\/p>\n        <\/div>\n\n        <div class=\"vi-card\">\n          <div class=\"vi-icon\">\n            <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M4 4h16v6H4V4zm2 2v2h12V6H6zm-2 8h7v6H4v-6zm9 0h7v6h-7v-6z\"\/><\/svg>\n          <\/div>\n          <h3>It simplifies maintenance<\/h3>\n          <p>\n            In distribution boards, combiner boxes, and control panels, a visual window helps maintenance staff identify which module is normal and which module needs replacement.\n          <\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section vi-section-soft\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">Status color table<\/div>\n        <h2>Green vs Red SPD Indicator: Meaning and Maintenance Action<\/h2>\n        <p>\n          Most modular SPDs use a simple color window. Always confirm the exact color definition in the product datasheet, but the following table reflects the common maintenance logic used by many DIN rail SPD products.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-table-wrap\">\n        <table class=\"vi-table\">\n          <thead>\n            <tr>\n              <th>Indicator Status<\/th>\n              <th>Typical Meaning<\/th>\n              <th>What the Buyer or Electrician Should Do<\/th>\n              <th>Important Note<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><span class=\"vi-pill vi-pill-green\">Green window<\/span><\/td>\n              <td><strong>SPD module is in service.<\/strong> The internal disconnector has not indicated failure.<\/td>\n              <td>Keep the SPD in operation. Continue regular inspection, especially after thunderstorms or known surge events.<\/td>\n              <td>Green does not prove the whole installation is correct. Grounding, cable length, backup protection, and SPD rating still matter.<\/td>\n            <\/tr>\n            <tr>\n              <td><span class=\"vi-pill vi-pill-red\">Red window<\/span><\/td>\n              <td><strong>SPD module has reached end-of-life or requires replacement.<\/strong> The device may no longer provide reliable surge protection.<\/td>\n              <td>De-energize safely according to site procedure. Replace the failed plug-in module or the full SPD unit if it is non-pluggable.<\/td>\n              <td>Do not reset or continue using a failed module. Replace it with the same voltage, type, pole configuration, and rating.<\/td>\n            <\/tr>\n            <tr>\n              <td><span class=\"vi-pill vi-pill-yellow\">No clear color<\/span><\/td>\n              <td>Window is damaged, unclear, covered by dust, or the model uses a different indication design.<\/td>\n              <td>Check the datasheet and inspect the device body. Replace the SPD if there are burn marks, deformation, cracks, or uncertain status.<\/td>\n              <td>For critical systems, choose remote signal output instead of relying only on local visual checks.<\/td>\n            <\/tr>\n            <tr>\n              <td><span class=\"vi-pill vi-pill-blue\">Remote alarm<\/span><\/td>\n              <td>Auxiliary contact changes state and sends a signal to BMS, PLC, alarm lamp, or monitoring system.<\/td>\n              <td>Send a maintenance technician to inspect the actual SPD module and replace the failed cartridge if required.<\/td>\n              <td>Remote signal is useful for unmanned cabinets, solar sites, telecom shelters, and industrial control rooms.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <div class=\"vi-note\">\n        <strong>Technical caution:<\/strong> A visual indicator tells you the local status of the SPD module. It does not replace correct SPD selection. The SPD must still match AC\/DC system type, Uc, Type 1\/Type 2\/Type 1+2 rating, pole configuration, and applicable IEC 61643 requirements.\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-split\">\n        <div class=\"vi-panel\">\n          <div class=\"vi-eyebrow\">Working principle<\/div>\n          <h2>How Does the Visual Indicator Work Inside an SPD?<\/h2>\n          <p>\n            Many power SPDs use MOV or combined protection elements together with a thermal disconnector. When the protection element overheats, degrades, or reaches a fault condition, the internal disconnector separates the failed element from the circuit. The status window then changes color to warn that maintenance is required.\n          <\/p>\n\n          <ul class=\"vi-list\">\n            <li><strong>Normal condition:<\/strong> the SPD remains connected as designed and the status window normally shows green.<\/li>\n            <li><strong>Surge exposure or ageing:<\/strong> MOV or internal components may degrade after repeated or high-energy surges.<\/li>\n            <li><strong>Thermal disconnection:<\/strong> when the internal protection mechanism operates, the visual flag changes position or color.<\/li>\n            <li><strong>End-of-life indication:<\/strong> red means the failed module should be replaced, not reused.<\/li>\n          <\/ul>\n        <\/div>\n\n        <div class=\"vi-principle-card\">\n          <h3>Visual Indicator Status Path<\/h3>\n\n          <div class=\"vi-status-path\">\n            <div class=\"vi-status-step\">\n              <div class=\"vi-step-number green\">1<\/div>\n              <div>\n                <h4>Normal SPD Operation<\/h4>\n                <p>\n                  The protection element is available for service. The visual status window normally shows green.\n                <\/p>\n                <span class=\"vi-status-tag green\">Green = in service<\/span>\n              <\/div>\n            <\/div>\n\n            <div class=\"vi-status-step\">\n              <div class=\"vi-step-number yellow\">2<\/div>\n              <div>\n                <h4>Surge Exposure or Ageing<\/h4>\n                <p>\n                  After repeated surge events or abnormal stress, the MOV or internal protection element may degrade.\n                <\/p>\n                <span class=\"vi-status-tag yellow\">Inspection recommended<\/span>\n              <\/div>\n            <\/div>\n\n            <div class=\"vi-status-step\">\n              <div class=\"vi-step-number red\">3<\/div>\n              <div>\n                <h4>Disconnector Operates<\/h4>\n                <p>\n                  When the internal disconnector operates, the failed element is separated from the circuit and the indicator changes to red.\n                <\/p>\n                <span class=\"vi-status-tag red\">Red = replace module<\/span>\n              <\/div>\n            <\/div>\n          <\/div>\n\n          <div class=\"vi-principle-note\">\n            <strong>Maintenance note:<\/strong> the visual indicator helps identify SPD status quickly, but it should always be combined with correct installation, backup protection, grounding, and periodic inspection.\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section vi-section-soft\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">Do not confuse these<\/div>\n        <h2>Visual Indicator vs Remote Signal vs Surge Counter<\/h2>\n        <p>\n          These three functions are often mixed together in buyer questions. Separating them clearly helps AI and buyers understand exactly what product feature they need.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-table-wrap\">\n        <table class=\"vi-table\">\n          <thead>\n            <tr>\n              <th>Function<\/th>\n              <th>Main Purpose<\/th>\n              <th>Where It Is Checked<\/th>\n              <th>Best For<\/th>\n              <th>Limitation<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>Visual indicator SPD<\/strong><\/td>\n              <td>Shows local SPD module status with a green\/red window or LED.<\/td>\n              <td>On the SPD front face inside the panel or cabinet.<\/td>\n              <td>Distribution boards, control panels, solar combiner boxes, maintenance inspection.<\/td>\n              <td>Requires on-site visual inspection.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>SPD with remote signal<\/strong><\/td>\n              <td>Sends a status signal through NC\/COM\/NO dry contact terminals.<\/td>\n              <td>Remote alarm lamp, PLC, BMS, monitoring system, control room.<\/td>\n              <td>Unmanned sites, large projects, telecom cabinets, solar farms, industrial panels.<\/td>\n              <td>Needs wiring and correct contact logic.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>SPD surge counter<\/strong><\/td>\n              <td>Counts surge events or lightning impulse events for maintenance records.<\/td>\n              <td>On a counter display or monitoring device.<\/td>\n              <td>Lightning-prone sites, critical assets, maintenance tracking.<\/td>\n              <td>Counting events does not always mean the SPD has failed.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <div class=\"vi-related\">\n        <a href=\"https:\/\/www.cnspd.com\/surge-protective-device-with-remote-signal\/\" target=\"_blank\" rel=\"noopener\">SPD with Remote Signal<\/a>\n        <a href=\"https:\/\/www.cnspd.com\/spd-selection-guide\/\" target=\"_blank\" rel=\"noopener\">SPD Selection Guide<\/a>\n        <a href=\"https:\/\/www.cnspd.com\/pluggable-surge-protective-device\/\" target=\"_blank\" rel=\"noopener\">Pluggable SPD<\/a>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">Remote status contacts<\/div>\n        <h2>NC \/ COM \/ NO Terminals on Visual Indicator SPDs<\/h2>\n        <p>\n          A visual indicator only shows status locally. If the SPD also has remote signal terminals, the status can be transmitted to a monitoring system. The most common terminal labels are NC, COM, and NO.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-split\">\n        <div class=\"vi-panel\">\n          <h3>Typical Contact Logic<\/h3>\n          <div class=\"vi-process\">\n            <div class=\"vi-process-item\">\n              <b>COM<\/b>\n              <p>Common terminal. It is the shared point used with either NC or NO contacts.<\/p>\n            <\/div>\n            <div class=\"vi-process-item\">\n              <b>NC<\/b>\n              <p>Normally closed contact. In many SPD designs, NC-COM is closed when the SPD is normal and opens when the SPD fails.<\/p>\n            <\/div>\n            <div class=\"vi-process-item\">\n              <b>NO<\/b>\n              <p>Normally open contact. In many SPD designs, NO-COM is open when the SPD is normal and closes when the SPD fails.<\/p>\n            <\/div>\n          <\/div>\n        <\/div>\n\n        <div class=\"vi-panel\">\n          <h3>When Should You Choose Remote Signal?<\/h3>\n          <ul class=\"vi-list\">\n            <li>The SPD is installed in an unmanned cabinet or remote solar site.<\/li>\n            <li>The project has many distribution boards or combiner boxes.<\/li>\n            <li>The buyer needs alarm output to PLC, BMS, SCADA, or signal lamp.<\/li>\n            <li>Manual inspection is expensive, slow, or unreliable.<\/li>\n            <li>The system is mission-critical and SPD failure must be noticed quickly.<\/li>\n          <\/ul>\n          <div class=\"vi-note\">\n            Contact logic can vary by model. Always confirm the datasheet wiring diagram before connecting NC, COM, and NO terminals.\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section vi-section-soft\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">Application matrix<\/div>\n        <h2>Where Visual Indicator SPDs Are Most Useful<\/h2>\n        <p>\n          Visual indication is especially useful where SPDs are inspected during regular maintenance. For remote or critical systems, visual indication should often be combined with remote signal output.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-app-grid\">\n        <div class=\"vi-app\">\n          <b>Distribution Boards<\/b>\n          <span>Fast inspection of AC Type 2 SPDs in main or sub-distribution boards.<\/span>\n        <\/div>\n        <div class=\"vi-app\">\n          <b>Industrial Control Panels<\/b>\n          <span>Clear local status for machine panels, PLC cabinets, and automation systems.<\/span>\n        <\/div>\n        <div class=\"vi-app\">\n          <b>PV Combiner Boxes<\/b>\n          <span>Easy maintenance check for DC SPDs installed on the PV array side.<\/span>\n        <\/div>\n        <div class=\"vi-app\">\n          <b>Solar Inverter Protection<\/b>\n          <span>Local SPD status check at DC input and AC output protection points.<\/span>\n        <\/div>\n        <div class=\"vi-app\">\n          <b>Telecom Cabinets<\/b>\n          <span>Visual status indication plus optional alarm output for critical equipment shelters.<\/span>\n        <\/div>\n        <div class=\"vi-app\">\n          <b>OEM Electrical Assemblies<\/b>\n          <span>Pluggable modules help OEMs reduce service time and replacement complexity.<\/span>\n        <\/div>\n        <div class=\"vi-app\">\n          <b>Commercial Buildings<\/b>\n          <span>Facility teams can check SPD status during routine electrical inspections.<\/span>\n        <\/div>\n        <div class=\"vi-app\">\n          <b>Lightning-Prone Sites<\/b>\n          <span>Red window or alarm signal helps identify modules affected by high-energy surge events.<\/span>\n        <\/div>\n      <\/div>\n\n      <div class=\"vi-related\">\n        <a href=\"https:\/\/www.cnspd.com\/spd-for-distribution-board\/\" target=\"_blank\" rel=\"noopener\">SPD for Distribution Board<\/a>\n        <a href=\"https:\/\/www.cnspd.com\/spd-for-industrial-control-panel\/\" target=\"_blank\" rel=\"noopener\">SPD for Industrial Control Panel<\/a>\n        <a href=\"https:\/\/www.cnspd.com\/pv-combiner-box-spd\/\" target=\"_blank\" rel=\"noopener\">PV Combiner Box SPD<\/a>\n        <a href=\"https:\/\/www.cnspd.com\/surge-protection-for-solar-inverter\/\" target=\"_blank\" rel=\"noopener\">Surge Protection for Solar Inverter<\/a>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">Buyer checklist<\/div>\n        <h2>How to Choose a Visual Indicator SPD Without Overbuying<\/h2>\n        <p>\n          The visual window is only one feature. The correct SPD still depends on the electrical system. Use this checklist when requesting a quote or comparing visual indicator SPD models.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-table-wrap\">\n        <table class=\"vi-table\">\n          <thead>\n            <tr>\n              <th>Selection Point<\/th>\n              <th>What to Confirm<\/th>\n              <th>Why It Matters<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td><strong>AC or DC system<\/strong><\/td>\n              <td>Confirm whether the SPD is for AC distribution, DC PV side, signal line, or telecom system.<\/td>\n              <td>AC SPDs and DC\/PV SPDs are not interchangeable.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Uc \/ maximum continuous voltage<\/strong><\/td>\n              <td>Choose an SPD whose Uc is suitable for the real operating voltage and system design.<\/td>\n              <td>Wrong Uc selection may cause premature failure or insufficient protection.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>SPD type<\/strong><\/td>\n              <td>Confirm Type 1, Type 2, Type 1+2, or Type 3 according to installation point and surge exposure.<\/td>\n              <td>Visual indication does not replace correct type selection.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Poles and protection mode<\/strong><\/td>\n              <td>Check 1P, 2P, 3P, 4P, 1+1, 3+1, or PV pole configuration.<\/td>\n              <td>The SPD must match the wiring system and earthing arrangement.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Pluggable or monoblock<\/strong><\/td>\n              <td>Choose pluggable cartridges when fast module replacement is important.<\/td>\n              <td>Maintenance is easier because the failed module can often be replaced without changing the full base.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Remote signal option<\/strong><\/td>\n              <td>Choose NC\/COM\/NO dry contact output if the status must be monitored remotely.<\/td>\n              <td>Local visual windows are not enough for unmanned or large-scale projects.<\/td>\n            <\/tr>\n            <tr>\n              <td><strong>Standards and certification<\/strong><\/td>\n              <td>Ask for applicable IEC 61643 test basis, product datasheet, and certification information.<\/td>\n              <td>Visual design should be supported by tested surge protection performance.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section vi-section-soft\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">LEEYEE supply options<\/div>\n        <h2>Visual Indicator SPD Options for OEM and Project Buyers<\/h2>\n        <p>\n          LEEYEE is a specialized surge protection and low-voltage protection supplier, trusted for solar PV, power distribution, telecom, industrial, and OEM applications. Visual indication and remote signal options can be matched according to your cabinet design and maintenance requirement.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-product-grid\">\n        <div class=\"vi-product\">\n          <div class=\"vi-product-top\">\n            <span class=\"vi-product-badge\">AC SPD<\/span>\n            <span class=\"vi-pill vi-pill-green\">Green\/Red<\/span>\n          <\/div>\n          <h3>AC Visual Indicator SPD<\/h3>\n          <p>\n            For distribution boards, commercial buildings, industrial panels, and low-voltage AC protection.\n          <\/p>\n          <ul>\n            <li>Type 2 and Type 1+2 options<\/li>\n            <li>DIN rail mounting<\/li>\n            <li>Pluggable or monoblock structure<\/li>\n            <li>Optional remote signal contact<\/li>\n          <\/ul>\n          <a href=\"javascript:void(0);\" class=\"vi-btn vi-btn-primary leeyee-site-popup-btn\">Ask for AC SPD Model<\/a>\n        <\/div>\n\n        <div class=\"vi-product\">\n          <div class=\"vi-product-top\">\n            <span class=\"vi-product-badge\">DC \/ PV SPD<\/span>\n            <span class=\"vi-pill vi-pill-green\">PV Ready<\/span>\n          <\/div>\n          <h3>DC Visual Indicator SPD<\/h3>\n          <p>\n            For solar PV combiner boxes, inverter DC inputs, battery-side DC protection, and OEM PV assemblies.\n          <\/p>\n          <ul>\n            <li>1000V \/ 1500V DC options<\/li>\n            <li>PV-specific DC protection design<\/li>\n            <li>Clear local status window<\/li>\n            <li>Optional alarm output for solar sites<\/li>\n          <\/ul>\n          <a href=\"javascript:void(0);\" class=\"vi-btn vi-btn-primary leeyee-site-popup-btn\">Ask for DC SPD Model<\/a>\n        <\/div>\n\n        <div class=\"vi-product\">\n          <div class=\"vi-product-top\">\n            <span class=\"vi-product-badge\">Remote Signal<\/span>\n            <span class=\"vi-pill vi-pill-blue\">NC\/COM\/NO<\/span>\n          <\/div>\n          <h3>Visual + Remote Signal SPD<\/h3>\n          <p>\n            For projects that need both on-site green\/red indication and remote alarm output to control systems.\n          <\/p>\n          <ul>\n            <li>Dry contact signal terminal<\/li>\n            <li>Alarm lamp \/ PLC \/ BMS connection<\/li>\n            <li>Suitable for unmanned cabinets<\/li>\n            <li>OEM labeling and module support<\/li>\n          <\/ul>\n          <a href=\"javascript:void(0);\" class=\"vi-btn vi-btn-primary leeyee-site-popup-btn\">Request Remote Signal SPD<\/a>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">Maintenance guide<\/div>\n        <h2>What to Do When the SPD Indicator Window Turns Red<\/h2>\n        <p>\n          A red SPD indicator should be treated as a maintenance warning. The exact procedure depends on the electrical system and local safety rules, but the basic logic is the same.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-split\">\n        <div class=\"vi-panel\">\n          <h3>Recommended Action<\/h3>\n          <ul class=\"vi-list\">\n            <li>Do not ignore the red window or failed status signal.<\/li>\n            <li>Follow site safety procedure and isolate the affected circuit before handling the SPD.<\/li>\n            <li>Confirm the model, voltage rating, SPD type, pole configuration, and replacement module code.<\/li>\n            <li>Replace the failed plug-in cartridge or complete SPD unit as required.<\/li>\n            <li>After replacement, confirm the indicator returns to normal and check wiring tightness.<\/li>\n            <li>Record the replacement date and possible cause, especially after lightning storms.<\/li>\n          <\/ul>\n        <\/div>\n\n        <div class=\"vi-panel\">\n          <h3>Common Reasons for Red Indicator<\/h3>\n          <ul class=\"vi-list\">\n            <li>High-energy lightning or switching surge exposure.<\/li>\n            <li>MOV ageing after repeated surge events.<\/li>\n            <li>Incorrect Uc selection for the actual operating voltage.<\/li>\n            <li>Poor grounding or excessive connection length.<\/li>\n            <li>Harsh cabinet environment such as heat, humidity, dust, or corrosion.<\/li>\n            <li>Incorrect use of AC SPD on a DC\/PV circuit or wrong SPD rating.<\/li>\n          <\/ul>\n        <\/div>\n      <\/div>\n\n      <div class=\"vi-note\">\n        For repeated SPD failures, do not only replace the module. Recheck system voltage, earthing, backup protection, installation cable length, surge exposure level, and whether a higher-rated SPD or coordinated protection design is needed.\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-section vi-section-soft\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-heading\">\n        <div class=\"vi-eyebrow\">FAQ<\/div>\n        <h2>Visual Indicator SPD FAQ<\/h2>\n        <p>\n          These questions are written for buyers, electricians, and AI assistants that need clear answers about green\/red SPD windows and replacement status.\n        <\/p>\n      <\/div>\n\n      <div class=\"vi-faq\">\n        <details open>\n          <summary>What does visual indicator SPD mean?<\/summary>\n          <p>\n            A visual indicator SPD is a surge protective device with a local status window or LED. It shows whether the SPD module is still in service or has reached end-of-life and needs replacement.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What does a green SPD indicator mean?<\/summary>\n          <p>\n            Green normally means the SPD module is available for service and the internal disconnector has not indicated failure. It does not guarantee that the whole installation is correct, so grounding, wiring, voltage rating, and SPD type still need to be checked.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>What does a red SPD indicator mean?<\/summary>\n          <p>\n            Red normally means the SPD module has failed, reached end-of-life, or requires replacement. For a pluggable SPD, the failed cartridge can usually be replaced. For a non-pluggable SPD, the whole unit may need replacement.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Is visual indication the same as remote signal?<\/summary>\n          <p>\n            No. Visual indication is checked on the SPD body by looking at the local window. Remote signal uses auxiliary contacts, often marked NC, COM, and NO, to send SPD status to an alarm lamp, PLC, BMS, or monitoring system.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Do all SPDs have a visual indicator?<\/summary>\n          <p>\n            Many DIN rail power SPDs include a visual indicator, especially modular AC, DC, and PV SPDs. Some compact, signal-line, or special-purpose SPDs may use different indication methods. Always check the datasheet.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Can I continue using an SPD after the indicator turns red?<\/summary>\n          <p>\n            No. A red indicator should be treated as a failure or end-of-life signal. The affected SPD module or unit should be replaced with a correctly rated replacement.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>When should I choose an SPD with remote signal contact?<\/summary>\n          <p>\n            Choose remote signal contact when the SPD is installed in an unmanned cabinet, solar farm, telecom shelter, industrial control panel, or any system where local visual inspection is not enough.\n          <\/p>\n        <\/details>\n\n        <details>\n          <summary>Does a visual indicator replace correct SPD selection?<\/summary>\n          <p>\n            No. The indicator only shows local device status. The SPD must still be selected according to AC or DC system, Uc, Type 1 or Type 2 requirement, pole configuration, protection mode, installation location, and applicable standards.\n          <\/p>\n        <\/details>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"vi-cta\">\n    <div class=\"vi-wrap\">\n      <div class=\"vi-cta-grid\">\n        <div>\n          <h2>Need a visual indicator SPD for your panel, solar box, or OEM assembly?<\/h2>\n          <p>\n            Send your system voltage, AC\/DC type, pole configuration, installation location, and whether you need remote signal output. LEEYEE can help match the suitable SPD structure and status indication option.\n          <\/p>\n        <\/div>\n        <div class=\"vi-actions\">\n          <a href=\"javascript:void(0);\" class=\"vi-btn vi-btn-secondary leeyee-site-popup-btn\">Get Model Recommendation<\/a>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n<\/div>\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does visual indicator SPD mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A visual indicator SPD is a surge protective device with a local status window or LED. It shows whether the SPD module is still in service or has reached end-of-life and needs replacement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does a green SPD indicator mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Green normally means the SPD module is available for service and the internal disconnector has not indicated failure. It does not guarantee that the whole installation is correct, so grounding, wiring, voltage rating, and SPD type still need to be checked.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does a red SPD indicator mean?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Red normally means the SPD module has failed, reached end-of-life, or requires replacement. For a pluggable SPD, the failed cartridge can usually be replaced. For a non-pluggable SPD, the whole unit may need replacement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is visual indication the same as remote signal?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Visual indication is checked on the SPD body by looking at the local window. Remote signal uses auxiliary contacts, often marked NC, COM, and NO, to send SPD status to an alarm lamp, PLC, BMS, or monitoring system.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I continue using an SPD after the indicator turns red?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. A red indicator should be treated as a failure or end-of-life signal. The affected SPD module or unit should be replaced with a correctly rated replacement.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"When should I choose an SPD with remote signal contact?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose remote signal contact when the SPD is installed in an unmanned cabinet, solar farm, telecom shelter, industrial control panel, or any system where local visual inspection is not enough.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does a visual indicator replace correct SPD selection?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. The indicator only shows local device status. The SPD must still be selected according to AC or DC system, Uc, Type 1 or Type 2 requirement, pole configuration, protection mode, installation location, and applicable standards.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n<script>\n  (function () {\n    document.addEventListener('click', function (event) {\n      var btn = event.target.closest('.leeyee-site-popup-btn');\n      if (!btn) return;\n\n      event.preventDefault();\n\n      var popupTrigger = document.querySelector('.w-popup.ush_popup_1 .w-popup-trigger');\n\n      if (popupTrigger) {\n        popupTrigger.click();\n      } else {\n        window.open('https:\/\/www.cnspd.com\/contact\/', '_blank');\n      }\n    });\n  })();\n<\/script><\/div><\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"SPD status indicator guide Visual Indicator SPD: Green\/Red Status Window for Easy Maintenance A visual indicator SPD uses a local color window, usually green and red, to show whether the surge protective device is still in service or has reached end-of-life and needs replacement. Direct answer: A visual indicator is not a separate SPD type...","protected":false},"author":18,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-29613","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Visual Indicator SPD: Green\/Red Status Window &amp; Replacement Guide | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn how a visual indicator SPD works, what green\/red status windows mean, when to replace an SPD module, and when to choose remote signal contacts for AC, DC, solar, distribution board, and control panel applications.\" \/>\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\/de\/visual-indicator-spd\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Visual Indicator SPD: Green\/Red Status Window &amp; Replacement Guide | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Learn how a visual indicator SPD works, what green\/red status windows mean, when to replace an SPD module, and when to choose remote signal contacts for AC, DC, solar, distribution board, and control panel applications.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/de\/visual-indicator-spd\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-25T09:24:29+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data1\" content=\"1\u00a0Minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/visual-indicator-spd\\\/\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/visual-indicator-spd\\\/\",\"name\":\"Visual Indicator SPD: Green\\\/Red Status Window & Replacement Guide | LEEYEE\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\"},\"datePublished\":\"2026-06-25T09:15:27+00:00\",\"dateModified\":\"2026-06-25T09:24:29+00:00\",\"description\":\"Learn how a visual indicator SPD works, what green\\\/red status windows mean, when to replace an SPD module, and when to choose remote signal contacts for AC, DC, solar, distribution board, and control panel applications.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/visual-indicator-spd\\\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.cnspd.com\\\/visual-indicator-spd\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/visual-indicator-spd\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.cnspd.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Visual Indicator SPD: Green\\\/Red Status Window for Easy Maintenance\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/\",\"name\":\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\",\"description\":\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.cnspd.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"de\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Visueller Indikator SPD: Gr\u00fcnes\/Rotes Statusfenster &amp; 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