| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect the amount of temperature variation by increase in contact resistance caused by the wear of a contact in a contact part without containing the amount of temperature variation in the contact part, a terminal part, or the like caused by current flowing in a circuit breaker, or temperature rising caused by loosening of a fastening crew for fastening an outer connecting wire to a fixed terminal. SOLUTION: This circuit breaker is equipped with: a current processing means 100 outputting a trip signal based on current flowing in an electric circuit 10; a trip device 17 operating with the trip signal of the current processing means 100; a switch 18 switching the electric circuit 10 with the trip device 17; and a temperature detecting means 300 detecting temperature of a to-be- monitored part 31 whose temperature is monitored, and the detected result of the temperature detecting means 300 is corrected on the basis of current flowing in the electric circuit 10.
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