Compact Type 2+3 AC Surge Protection for 3P+N Systems
LY1-D20M/3(S)+1 is a compact 3P+N pluggable Type 2+3 AC surge protective device for three-phase plus neutral systems. Its coordinated MOV and GDT structure provides L-N and N-PE surge protection with 10kA nominal discharge current and 20kA maximum discharge current.
Class II+III / Type 2+3 downstream surge protection
Compact 3P+N configuration with L-N and N-PE protection
Coordinated high-energy MOV and GDT protection technology
Pluggable modules with visual indication and optional remote contact
Suitable Applications
LY1-D20M/3(S)+1 is suitable for compact three-phase plus neutral systems requiring coordinated Type 2+3 surge protection in limited DIN-rail space.
Sub-Distribution Boards
For downstream protection in compact commercial and industrial 3P+N distribution boards.
Industrial Control Panels
Suitable for machinery controls, factory automation cabinets, HVAC panels, and production equipment.
Commercial Facilities
Helps protect building controls, office distribution cabinets, retail systems, and sensitive commercial loads.
Solar Inverter AC Panels
For three-phase solar inverter AC-side panels when the selected Uc version matches the system voltage.
FAQ
Common questions about LY1-D20M/3(S)+1 compact 3P+N pluggable Type 2+3 AC surge protective device selection.
What is LY1-D20M/3(S)+1 used for?
LY1-D20M/3(S)+1 is used for downstream and final-distribution surge protection in compact three-phase plus neutral AC systems.
What does 3P+N mean?
3P+N means the SPD is designed for three phase conductors plus neutral, using MOV protection on the L-N paths and a GDT protection path between N-PE.
Is LY1-D20M/3(S)+1 a Type 2 or Type 3 SPD?
It is classified as Class II+III / Type 2+3, making it suitable for coordinated downstream and final-distribution surge protection.
Does this SPD use MOV or GDT protection?
It uses a coordinated MOV and GDT structure. MOV modules protect the L-N paths, while the GDT provides the N-PE protection path.
What discharge current ratings does it provide?
It provides 10kA nominal discharge current and 20kA maximum discharge current on both the L-N and N-PE protection paths.
What should be confirmed before ordering?
Confirm the nominal L-N voltage, required Uc and Up level, 3P+N wiring arrangement, 125A maximum backup-fuse coordination, conductor size, DIN-rail space, and optional remote-contact requirement.
