| 摘要 |
PROBLEM TO BE SOLVED: To provide an interlock mechanism in a simple structure for preventing a door from opening except when a main breaker is put in a disconnection state in a draw out type circuit breaker and making it possible to move the main breaker freely except when the door is open. SOLUTION: When a door 11 is closed, a shutter driving lever is rotated to dislocate a shutter 13 from a complete closed state of a handle mounting hole 15a to a half opened state. When the handle is mounted, a slant fitting bent part 13b is driven and the shutter 13 is more dislocated to rotate the shutter driving lever more and dislocate a stationary-side lock-lever rotation stopping pin 30 to a position for stopping the rotation of a stationary-side lock lever 29. When the rotation of the stationary-side lock lever 29 is stopped, the rotation stopping pin 20 can be put in a fitting state with a door-side lock pin 34 to prevent the door from opening. Even when the handle is removed during the movement of the main breaker, an opening-door lock holding pin 25 is fitted with a guide arm 18a to make the shutter 13 half opened, and the stationary-side lock-lever stopping pin is held at a position for keeping its lock function. |
