Auxiliary measuring device of molded case circuit breaker

The invention discloses an auxiliary measuring device for a molded case circuit breaker, and the device comprises a switching-on and switching-off assembly, a measuring circuit, a first contact assembly, a second contact assembly, a third contact assembly, an electromagnetic mutual inductance assembly, and a shunt release. The second contact assembly is limited in the electromagnetic mutual inductance assembly and is far away from the third contact assembly, the shunt release drives the first contact assembly to be far away from the third contact assembly, the electromagnetic mutual inductance assembly drives the second contact assembly to be tightly attached to the third contact assembly, and the measuring circuit is connected with the first contact assembly through a first wire. The measuring circuit is connected with the second contact assembly through a second wire and connected with the electromagnetic mutual inductance assembly through a third wire, and the electromagnetic mutual inductance assembly is