| 摘要 |
A circuit breaker is provided with diagnostic function allowing a user to know whether the circuit breaker is operated normally. The circuit breaker includes a breaker unit 10 for breaking a current flowing from a battery VB to a load 17, a switching element 42 for driving the breaker unit 10 in response to a collision signal, a self-diagnostic part 41 for responding diagnostic signals to diagnose the normality of a line from the battery VB to the unit 10 via the switching element 42, a transistor Tr, a light-emitting diode LED and a resistance R. With the structure of the circuit breaker, by supplying the circuit breaker with the diagnostic signals at appropriate intervals, the user can detect whether peripheral circuits of the breaker unit have any trouble in operation.
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