This tripping coil is used for the instantaneous remote tripping of the MasterPact MTZ circuit breaker. Tripping occurs instantaneously as soon as the supply voltage drops to a value of 0.7x the nominal voltage. Instantaneous undervoltage release MN diag 380/480V AC MTZ replacement coil. This tripping coil contains a communication-capable diagnostic function. This tripping coil can be ordered as a spare part.