High-Energy Type 1+2 AC Surge Protection for Main Distribution Boards
LY1-B25/1(S) is a monoblock single-pole Type 1+2 AC surge protective device designed for main distribution boards and low-voltage AC power systems. With 25kA impulse discharge current and 100kA maximum discharge current, it helps protect incoming power lines against lightning surges and transient overvoltage.
Class I+II / Type 1+2 AC SPD for main distribution board protection
25kA Iimp and 100kA Imax for high-energy surge protection
Monoblock design with high-energy MOV protection element
Suitable for TN-S, TN-C, and TT network systems
Suitable Applications
LY1-B25/1(S) is suitable for AC power systems where high-energy surge protection is required at the incoming power side or main distribution level.
Main Distribution Boards
For incoming AC power protection in main distribution boards and low-voltage panels.
Commercial Buildings
Helps protect building power distribution systems from lightning-induced surges.
Industrial Power Panels
Suitable for low-voltage industrial panels that require Type 1+2 surge protection.
Solar AC Side Panels
Can be used on the AC side of solar systems when the voltage and protection mode match the design.
FAQ
Common questions about LY1-B25/1(S) monoblock single-pole AC surge protective device selection and application.
What is LY1-B25/1(S) used for?
LY1-B25/1(S) is used for AC surge protection at the main distribution board or incoming power side. It helps limit lightning surges and transient overvoltage in low-voltage AC systems.
What does Type 1+2 mean?
Type 1+2 means the SPD is designed to handle high-energy impulse currents and downstream surge protection requirements. It is commonly used at the main distribution level where stronger surge protection is needed.
What surge ratings does this SPD provide?
LY1-B25/1(S) provides 25kA impulse discharge current Iimp, 25kA nominal discharge current In, and 100kA maximum discharge current Imax.
Which network systems can it be used in?
This model is suitable for TN-S, TN-C, and TT network systems when the protection mode and voltage rating match the electrical design.
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, network system, protection mode, backup fuse, installation space, wiring cross-section, and remote signalling requirement before ordering.
■ Connection Diagram
