| 摘要 |
PROBLEM TO BE SOLVED: To make parts and wiring low cost in operational system with easy wiring work and good safety in operation, by separating a driving voltage for a circuit breaker and an operational voltage for an operation control unit. SOLUTION: A relay contact 3 for reversing a breaker 4 in an opened or closed state is inserted in a power line 2 that feeds power to the breaker 4. An operational control board 1 is made up of relays RY1 to RY8 driven by a DC low voltage through a rectifying and smoothing circuit 7 from a transformer 6. When an operation control unit PBS is made opened or closed in operation, the relays RY1 to RY5 are driven selectively, and the corresponding relay contact 3 is closed and the breaker 4 is turned on or off reversely to close or open a shutter. In this case, the operation control unit PBS connected to the operation control board 1 is of low-voltage withstanding-type. |
