| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit breaker allowing automatic setting of a time-limited tripping operation according to a switching state of a circuit breaker contact and a flowing state of a load current. SOLUTION: In this circuit breaker 2a, the load current flowing through a cable way 1 is detected, a detection signal thereof is subjected to an arithmetic process by a calculation part 6 to cut off the load current by the circuit breaker contacts 3. The circuit breaker is provided with: a first delay means 10 for outputting a signal delayed by a predetermined time based on a voltage inputted from the cable way 1; and a determination part 11 for determining the switching states of the contacts 3 and the flowing state of the load current based on the signal inputted from the delay means 10 and a signal inputted from a signal conversion part 5 to output the determination result thereof to the calculation part 6; and is so structured that the calculation part 6 sets the time-limited tripping operation based on the determination result of the determination part 11. COPYRIGHT: (C)2004,JPO
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