Miniature circuit breaker

A miniature circuit breaker, comprising a housing and a handle. An overload protection device and an operating mechanism which is connected to a moving contact are provided in the housing; the overload protection device comprises a temperature control assembly provided with a bimetallic strip; the side in the housing close to the moving contact is provided with an incoming line connecting terminal connected to the moving contact; a stationary contact matching the moving contact is provided on one side of the moving contact, and the temperature control assembly is provided on the other side of the moving contact; when overload, the temperature control assembly drives a temperature control protection device provided in the housing to trigger the circuit breaker to trip; the temperature control protection device comprises a separation plate and a thermal trip rod; the separation plate separates the moving contact and the thermal trip rod in two different planes; the temperature control assembly comprises the bimetallic strip and a current-carrying conductor; when the circuit breaker is overloaded, a movable end of the bimetallic strip drives the thermal trip rod to rotate to trigger the circuit breaker to trip. The present utility model reduces the length of the current-carrying conductor of the temperature control assembly, decreases the internal resistance and reduces heat generation, and avoids damage to parts caused by excessive temperature rise of the temperature control assembly.