| 摘要 |
A miniature moulded case circuit breaker includes an insulating moulded case(9), inlet and outlet terminals (10,11) placed in the case, a thermal tripping system, a magnetic tripping system, a movable contact(16), a fixed contact, an operating mechanism (12) and an arc extinguishing system. The operating mechanism drives the movable contact to realize the closing and disconnecting of a circuit. The magnetic tripping system is composed of a magnetic yoke, cores (3,5), a sleeve and a coil (2). One end of the coil is connected with the fixed contact by the magnetic yoke or directly connected with the fixed contact and the other end of the coil is connected with the thermal tripping system or connected with the terminals. The coil of the magnetic tripping system is a non-circle structure. The cores of the magnetic tripping system are made of non-cylindrical magnetic material. The sleeve of the magnetic tripping system is a non-circle structure. The circuit breaker has the advantages of a thin type and simple structure.
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