| 摘要 |
<p>The invention provides a circuit breaker, even with the same electrified current, bending of a bimetallic strip can be further improved. The circuit breaker is provided with a thermal trip device (300A) formed by a heater (10) with a load current passing by and a bimetallic strip (50), if the load current is in an over-current state, bending of the bimetallic strip (50) is used to drive a switch mechanism part (200), thereby separating a movable contact point (11) and a fixed contact (8), in the circuit brekaer, an insulation sheet (1) making the heater and the bimetallic strip (50) in insulation is winded in a mode of containing the heater (10) and the bimetallic strip (50) inside, and covers the heater (10) and the bimetallic strip (50) in a mode that heat dissipation of the heater (10) to the surrounding and heat dissipation of the bimetallic strip (50) to the surround are inhibited.</p> |
