TeSys GV electrical trip unit, MN undervoltage release, 380-415V AC 50Hz, 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).