| 摘要 |
PURPOSE:To electrically disconnect a unit device easily from a load side by providing a fixed circuit-disconnecting part in which a circuit disconnecting device is fixed to a casing, a movable circuit-disconnecting part slidably provided in the unit device and a driving mechanism for driving the movable circuit-disconnecting part. CONSTITUTION:A drawable unit device 6 is installed in a multi-stage in a casing 1, and this unit device 6 can be connected to and disconnected from a load side by a circuit- disconnecting device 20. There are provided with a fixed circuit-disconnecting part 16 in which the circuit disconnecting device 20 is fixed to the casing 1 and which has a fixed contactor 17, and a movable circuit-disconnecting part 16 having a movable contactor 15 connected to the fixed contactor 17 slidably provided in the unit device. Further there are provided with a driving mechanism 22 which connects the movable contactor 15 to and disconnects it from the fixed contactor 17 by reciprocating the movable circuit disconnecting part 16 and a movable circuit disconnecting part 14 provided between the movable circuit disconnecting part 16 and the unit device. By the constitution thus obtained, in a condition that the unit device 6 is stored in the casing 1, the movable contactor 15 of the movable circuit disconnecting part 14 can be brought into contact with the fixed contactor 17 of the fixed circuit disconnecting part 16, and electrical disconnection of the unit device 6 from the load side can be easily performed. |
