The under voltage release(UVR) as the part of remote tripping is used for EasyPact EZC100 circuit breakers. This UVR is worked at 24VDC voltage(Un). Tripping threshold is between 0.35 and 0.7times the related voltage. This release trips the circuit breaker when control voltage rises drops below a tripping threshold. Circuit breaker closing is possible only if the voltage exceeds 0.85 times the related voltage. This installation of SHT is external mounting.