TeSys GV electrical trip unit, MN undervoltage release, 277V AC 60Hz, for motor circuit breakers GV4.Opening of the the circuit breaker is ensured when the control voltage drops below 0.35 Uc, and possible between 0.35-0.7 Uc.Closing of the circuit breaker is possible when the control voltage is in limits 0.85-1.1 Uc.To be plugged inside the circuit breaker, connection by spring terminals.Multi standards certified (IEC, UL, CSA), Green Premium compliant (RoHS/REACh).