Patent ID: 8796570

Claim:
An interlock device of a draw-out type circuit breaker, comprising: a tripping button that is linked to a tripping mechanism of the draw-out type circuit breaker; an interlock rod that is placed so as to be movable up and down; wherein the tripping button mechanically prevents an operation to raise the interlock rod unless the tripping button is operated to place the draw-out type circuit breaker in an open state, so a power distribution board floor surface or a member fixed on the power distribution board floor surface and the interlock rod mechanically interfere with each other and the draw-out type circuit breaker is fixed at a predetermined position in the power distribution board; and wherein when the interlock rod interferes with the power distribution board floor surface or the member fixed on the power distribution board floor surface, the interlock rod is placed in a lower position only when the draw-out type circuit breaker is placed at an operation position at which a main circuit portion in the power distribution board and the draw-out type circuit breaker are connected to each other by a connecting part of them, at a disconnected position at which a necessary insulated distance is secured within the connecting part of the main circuit portion in the power distribution board and the draw-out type circuit breaker, or at a position outside the power distribution board.