This tripping coil is used for the instantaneous remote tripping of the MasterPact MTZ circuit breaker. In conjunction with an XF closing coil and an MCH motor operator, the MasterPact can be remotely controlled. Tripping occurs instantaneously via a shunt current. Instantaneous voltage release 2. MX 277V AC for MasterPact MTZ1 withdrawable unit. This tripping coil can only be ordered in conjunction with a configured circuit breaker.