Mounting structure of circuit breaker

The utility model relates to the field of low-voltage electric appliances, in particular to an installation structure of a circuit breaker, which comprises an installation plate (2a) and a guide rail (1a), the circuit breaker (3a) is fixedly arranged on the installation plate (2a), and the installation plate (2a) is fixedly arranged on the guide rail (1a); the mounting plate (2a) comprises a bearing part (20-21a) and a connecting part (22a), the cross section of the bearing part (20-21a) is of a U-shaped structure, the bearing part (20-21a) comprises a bottom plate (20a) and a side plate (21a), and the bottom plate (20a) and the connecting part (22a) are connected with the two ends of the side plate (21a) in a bent mode respectively and bent towards the two sides of the side plate (21a) respectively; the circuit breaker (3a) is arranged in the bearing part (20-21a) and fixedly connected with the bottom plate (20a), the two connecting parts (22a) are respectively connected with the two guide rails (1a) which a