Adjusting pull rod, circuit breaker and circuit protection system

The utility model discloses an adjusting pull rod, a circuit breaker and a circuit protection system. The adjusting pull rod comprises a first connecting part, the first connecting part comprises a first end and a second end which are opposite to each other, and the first end is used for being connected with a bimetallic strip; the second connecting part is formed by extending from the second end to the side away from the first connecting part, the second connecting part is provided with a screw mounting hole used for mounting an adjusting screw, the screw mounting hole penetrates through the second connecting part in the first direction, and a safety gap is reserved between the side, close to the microswitch, of the second connecting part and an elastic piece of the microswitch; the first direction is the direction from the second connecting part to the microswitch; and the first connecting part and the second connecting part are integrally formed parts. The relative position of the first connecting part and