High-Energy Type 1+2 AC Surge Protection for TN-S Distribution
LY1-B25/4(S) is a monoblock 4-pole Type 1+2 AC surge protective device designed for TN-S low-voltage distribution systems. With 25kA impulse discharge current, 100kA maximum discharge current, and 100kA total discharge current, it provides high-energy surge protection for three-phase plus neutral power distribution.
Class I+II / Type 1+2 AC SPD for main distribution board protection
25kA Iimp, 25kA In, 100kA Imax, and 100kA Itotal surge rating
4-pole monoblock design for three-phase plus neutral AC surge protection
Suitable for TN-S systems with L-PE and N-PE protection modes
Suitable Applications
LY1-B25/4(S) is suitable for TN-S low-voltage AC systems where high-energy Type 1+2 surge protection is required at the incoming power side or main distribution level.
Main Distribution Boards
For incoming surge protection in TN-S main distribution boards and low-voltage panels.
Commercial Buildings
Helps protect building power distribution systems from lightning-induced surges.
Industrial Power Panels
Suitable for industrial three-phase plus neutral panels requiring high-energy SPD protection.
Solar AC Side Panels
Can be used on the AC side of solar systems when voltage, network system, and protection mode match the design.
FAQ
Common questions about LY1-B25/4(S) 4-pole monoblock AC surge protective device selection and application.
What is LY1-B25/4(S) used for?
LY1-B25/4(S) is used for high-energy AC surge protection at the main distribution board or incoming power side of TN-S low-voltage AC systems.
What is the difference between LY1-B25/3(S) and LY1-B25/4(S)?
LY1-B25/3(S) is a 3-pole version for TN-C systems, while LY1-B25/4(S) is a 4-pole version for TN-S systems with three-phase plus neutral protection. The 4-pole version provides a total discharge current rating of 100kA.
What surge ratings does this SPD provide?
LY1-B25/4(S) provides 25kA impulse discharge current Iimp, 25kA nominal discharge current In, 100kA maximum discharge current Imax, and 100kA total discharge current Itotal.
Which network system is this model suitable for?
This model is suitable for TN-S network systems when the voltage rating, protection mode, and system design match the application requirements.
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.
