Compact Type 2+3 AC Surge Protection for Two-Pole Circuits
LY1-D20M/2(S) is a compact two-pole pluggable Type 2+3 AC surge protective device designed for single-phase distribution systems and space-limited control panels. Its high-energy MOV modules provide fast surge limitation through L-PE and N-PE protection paths, with 10kA nominal discharge current and 20kA maximum discharge current.
Class II+III / Type 2+3 downstream surge protection
Compact two-pole design with L-PE and N-PE protection
10kA nominal and 20kA maximum discharge current
Replaceable cartridges with visual indication and optional remote contact
Suitable Applications
LY1-D20M/2(S) is suitable for compact single-phase AC systems requiring two-pole Type 2+3 surge protection in limited DIN-rail space.
Compact Distribution Boards
For residential, commercial, and light-industrial panels with limited DIN-rail space.
Control Cabinets
Suitable for compact machinery controls, automation cabinets, HVAC systems, and equipment panels.
UPS & Telecom Power
Helps protect UPS inputs, telecom power supplies, communication equipment, and sensitive electronic loads.
Solar Inverter AC Boxes
For single-phase solar inverter AC-side boxes when the selected Uc rating matches the system voltage.
FAQ
Common questions about LY1-D20M/2(S) compact two-pole pluggable Type 2+3 AC surge protective device selection.
What is LY1-D20M/2(S) used for?
LY1-D20M/2(S) is used for downstream and final-distribution surge protection in compact single-phase AC systems. It helps limit transient overvoltage through two protection paths before the surge reaches connected equipment.
Is LY1-D20M/2(S) a single-pole or two-pole SPD?
LY1-D20M/2(S) is a two-pole surge protective device. The existing page title describing it as single-pole should be changed to two-pole.
Is LY1-D20M/2(S) a Type 2 or Type 3 SPD?
LY1-D20M/2(S) is classified as Class II+III / Type 2+3, making it suitable for coordinated downstream and final-distribution surge protection.
Does this product use MOV or GDT protection?
The product specification identifies high-energy MOV protection. The previous body text describing the complete product as a GDT SPD should be removed to keep the page technically consistent.
What discharge current ratings does it provide?
It provides 10kA nominal discharge current In and 20kA maximum discharge current Imax, both based on the 8/20μs current waveform.
What should be confirmed before ordering?
Confirm the nominal system voltage, required Uc and Up level, two-pole wiring arrangement, 125A maximum backup-fuse coordination, conductor size, available DIN-rail space, and optional remote-contact requirement.
