| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit breaker that can measure a cable way current independently of selection of a voltage line by only incorporating one current sensor, and that is used for a single-phase three-wire cable way.SOLUTION: A circuit breaker has: a current sensor measuring a current of a branch cable way and consisting of a hall element 7 and a current transformer 8; and a measurement terminal 9 outputting detected current information to exterior. The current sensor is installed to a cable way on a neutral line side of the branch cable way 13. A power supply side terminal 1 and a load side terminal 2 are configured by three terminals corresponding to three poles of a single-phase three-wire cable way. Two terminals connecting voltage lines allow respective one terminal metal fittings 11 and 12 to move between the two terminals. The terminal metal fittings 11 and 12 are arranged only to a terminal corresponding to the voltage line to be connected. |
