Abstract: The circuit breaker is fabricated by an assembly step that makes a circuit breaker assembly with a moving contact metal plate, stationary contact metal plate, and bimetallic strip disposed in prescribed locations in an external case; and an anneal step that introduces the circuit breaker assembly made in the assembly step into an anneal oven, heats the circuit breaker assembly in the anneal oven and then cools it to anneal both the moving contact metal plate and the bimetallic strip and produce a heat-treated circuit breaker.

Abstract: The circuit breaker is fabricated by an assembly step that makes a circuit breaker assembly with a moving contact metal plate, stationary contact metal plate, and bimetallic strip disposed in prescribed locations in an external case; and an anneal step that introduces the circuit breaker assembly made in the assembly step into an anneal oven, heats the circuit breaker assembly in the anneal oven and then cools it to anneal both the moving contact metal plate and the bimetallic strip and produce a heat-treated circuit breaker.

Abstract: A breaker includes a fixed metal plate, a moving metal plate, a bimetal, and a heater. The fixed plate includes a fixed contact in a space of an exterior case having an electrically-insulating case and an exterior metal plate. The exterior plate and the fixed plate are arranged opposed to each other, and fixed to the electrically-insulating case. The bimetal has a convex shape, and is arranged between the heater and the moving plate. The electrically-insulating case includes first and second outer walls and protruding from the both ends of the case. A central part of the fixed plate is fixed to the first outer wall, and a part of moving plate is fixed to the second outer wall. The exterior plate closes the opening of the space.

Abstract: A breaker includes a fixed metal plate 4, a moving metal plate 6, a bimetal 8, and a heater 9. The fixed plate 4 includes a fixed contact 5 in space 20 of an exterior case 1 including an electrically-insulating case 2 and an exterior metal plate 3. The exterior plate 3 and the fixed plate 4 are arranged at opposed positions, and fixed to the case 2. The bimetal 8 has a convex shape, and is arranged between the heater 9 and the moving plate 6. The case 2 includes first and second outer walls 11A and 11B protruding from the both ends of the case 2. A central part 4B of the fixed plate 4 is fixed to the first outer wall 11A. A part of moving plate 6 is fixed to the second outer wall 11B. The exterior plate 3 closes the opening of the space 20.