| 摘要 |
PURPOSE:To allow throw-in of a draw out type circuit breaker only after connection of a plug by an arrangement wherein a movable lock member responds to connection of a control circuit through plugs on board side and the draw out type circuit breaker side and disengages a fixed lock member. CONSTITUTION:Upon connection of a board side plug 3 with a circuit breaker side plug 4, a press bar 21 pushes a movable lock member, i.e., a drive pin 15, to rotate a lock lever 5 clockwise around a pin 14. When a lever (not shown) is operated to lift an interlock pin 9 and a circuit breaker l is pushed to an operating position(right side on the drawing), engaging part 7b of a plug cover 7 comes into contact with a protrusion 8a of a lock member, i.e., a guide board 8. Consequently, the plug cover 7 rotates clockwise and the cover part 7a covers the front of the plug 3. A lock lever 13 is then rotated around a pin 4a to take in the pin 3b of the plug 3. Consequently, a truck type circuit breaker is allowed to be thrown in only after connection of the plugs 3 and 4 while furthermore disconnection of plugs 3 and 4 is blocked during operation. |
