| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce cost and expand an effective space inside a panel, by controlling a fan for a panel automatically and efficiently with a circuit breaker to make it unnecessary to provide a temperature detector or a controller separately. <P>SOLUTION: In the circuit breaker 1 comprising a load apparatus 4 and the fan 5 for a panel for ventilating the panel both connected to a load circuit, a current transformer 9 passed through a main electric path 7 detects a consumed current of the load apparatus 4, a relay contact 16 is turned on to operate the fan 5 when the detected consumed current exceeds a predetermined value, and the relay contact 16 is turned off to stop the fan 5 when the detected consumed current becomes the predetermined value or lower. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
