Pluggable Type 1+2 AC Surge Protection for 3P+N Systems
LY1-12.5/3(S)+1 is a 3P+N pluggable Type 1+2 AC surge protective device designed for low-voltage distribution systems. It combines high-energy MOV and GDT protection elements for L-N and N-PE protection, helping limit lightning surges and transient overvoltage in three-phase plus neutral AC power circuits.
3P+N Type 1+2 AC SPD for main distribution board protection
L-N and N-PE protection modes with MOV + GDT hybrid design
12.5kA / 50kA Iimp and 20kA / 50kA In surge ratings
Pluggable module design with optional remote contact for status monitoring
Suitable Applications
LY1-12.5/3(S)+1 is suitable for low-voltage 3P+N AC systems where Type 1+2 surge protection is required at the incoming power side or distribution panel level.
Main Distribution Boards
For incoming surge protection in three-phase plus neutral AC distribution boards.
Commercial Buildings
Helps protect commercial electrical systems from lightning-induced surges and switching overvoltage.
Industrial Power Panels
For low-voltage power panels and equipment cabinets requiring 3P+N surge protection.
Solar AC Side Panels
Can be used on the AC side of solar systems when voltage rating and protection mode match the design.
FAQ
Common questions about LY1-12.5/3(S)+1 3P+N pluggable Type 1+2 AC surge protective device selection and application.
What is LY1-12.5/3(S)+1 used for?
LY1-12.5/3(S)+1 is used for 3P+N AC surge protection in low-voltage distribution systems. It helps limit transient overvoltage in L-N and N-PE protection paths.
What does 3P+N mean?
3P+N means the SPD is designed for three-phase plus neutral systems, with protection paths between L-N and N-PE.
What is the role of MOV and GDT?
The MOV helps clamp transient overvoltage quickly, while the GDT supports high-energy discharge, especially in the N-PE protection path.
What surge ratings does this SPD provide?
This model provides 12.5kA / 50kA impulse discharge current Iimp, 20kA / 50kA nominal discharge current In, and 50kA / 100kA maximum discharge current Imax for L-N / N-PE protection paths.
What voltage options are available?
Available L-N maximum continuous operating voltage options include 75V, 150V, 275V, and 320V AC. The N-PE continuous operating voltage is 255V.
What should be confirmed before ordering?
Please confirm voltage rating, 3P+N system design, L-N / N-PE protection mode, backup fuse, DIN-rail space, wiring cross-section, and remote contact requirement before ordering.
