| 摘要 |
A circuit breaker according to the present invention includes a terminal switching unit (120, 320, 420) mounted in an enclosure (110, 210, 310, 410, 510) thereof, and the terminal switching unit accommodates, in a base (130, 330, 430) as an outer casing thereof, a fixed contactor (140) and a movable contactor (150) contactable with and separated from each other, a sliding unit (160) rotatably supporting the movable contactor, and a detection mechanism (170) to detect a fault current. Radiators (R1, R3, R4, R5) are provided at side portions of at least one of a contact portion (CP) where the movable contactor comes in contact with the fixed contactor, the sliding unit and the detection mechanism, each radiator radiating heat to the outside of the base. This may prevent an increase in temperature of the circuit breaker within a limited space without an increase in costs. |
