| 摘要 |
An objective of the present invention is to provide a circuit breaker capable of shortening a time for starting a tripping operation of breaker during occurrence of large current, without wear of contacts and welding, and having good energization performance for a long period with excellent reliability. The circuit breaker of the present invention includes a second tripping mechanism which performs a tripping operation of the breaker before an arcing occurring between open/close contacts of the breaker when a load current exceeds a maximum instantaneous current setting value of breaker. The tripping operation of breaker caused by the second tripping mechanism is faster than a tripping operation caused by a first tripping mechanism.
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