High-Energy Type 1+2 AC Surge Protection for 1P+N Systems
LY1-B25/1(S)+1 is a monoblock 1P+N Type 1+2 AC surge protective device designed for TT and TN-S low-voltage distribution systems. It combines high-energy MOV and GDT protection elements to help protect incoming AC power lines from lightning surges and transient overvoltage.
Class I+II / Type 1+2 AC SPD for main distribution board protection
1P+N protection design for TT and TN-S network systems
High-energy MOV and GDT elements for L-N and N-PE protection
35mm DIN-rail mounting for main distribution boards and power panels
Suitable Applications
LY1-B25/1(S)+1 is suitable for TT and TN-S AC power systems where Type 1+2 surge protection is required at the incoming power side or main distribution level.
Main Distribution Boards
For incoming surge protection in single-phase plus neutral AC distribution boards.
Residential Power Systems
Suitable for residential service panels where 1P+N surge protection is required.
Bâtiments commerciaux
Helps protect commercial low-voltage power systems from lightning-induced surges.
Power Panels
For control cabinets, combiner boxes, and low-voltage AC power panels.
FAQ
Common questions about LY1-B25/1(S)+1 1P+N monoblock AC surge protective device selection and application.
What is LY1-B25/1(S)+1 used for?
LY1-B25/1(S)+1 is used for Type 1+2 AC surge protection in TT and TN-S systems. It protects L-N and N-PE paths at the main distribution board or incoming power side.
What does 1P+N mean?
1P+N means the SPD is designed for single-phase plus neutral systems, with protection paths between L-N and N-PE depending on the system design.
What surge ratings does this SPD provide?
The product provides 25kA / 50kA impulse discharge current Iimp, 25kA / 50kA nominal discharge current In, 100kA maximum discharge current Imax, and 50kA total discharge current Itotal.
What is the role of MOV and GDT in this SPD?
The MOV helps clamp transient overvoltage quickly, while the GDT is used for high-energy discharge, especially in the N-PE protection path.
Does this model support remote signalling?
Yes. The “S” version can include optional remote contact for SPD status monitoring. Please confirm this requirement before ordering.
What should be confirmed before ordering?
Please confirm system voltage, TT or TN-S network system, protection mode, backup fuse, installation space, wiring cross-section, and remote signalling requirement before ordering.
