KLR series leakage protection relay cooperates with KCT leakage transformer. When the leakage current reaches the set value, the relay acts. Through shunt/undervoltage release, low voltage circuit breakers or AC contactors of various specifications, such as UKM32, cut off power supply to protect personal or equipment safety.

KLR121 has manual and automatic reset tripping contacts, delayed start indicator, tripping indicator, leakage/virtual connection/disconnection detection of current transformer, and extremely strong electric interference resistance.