| 摘要 |
A switching device for motor starters comprising a basic block and as required one or more adder blocks, the basic block being mountable on the side of a contactor and having two electrically separate circuits, one NO and one NC, the basic block including two pairs of stationary contact tips and two pairs of movable contact tips cooperable therewith, the latter being mounted for movement relative to a plunger which itself is supported for movement relative to the housing of the basic block, the adder block being mountable to an end wall of the basic block, the adder block including both NO and NC stationary contact tips and a movable plunger which supports a convertible contact tip for movement relative thereto, the position of the convertible contact tip relative to the movable plunger being arrangeable such that the former may be made to cooperate with either the NO or NC stationary contact tips of the adder block to provide the latter with either a NO or NC mode of operation, and the movable plunger of the adder block including means formed integrally therewith engageable with corresponding means suitably provided on the movable plunger of the basic block when the adder block is mounted to the basic block.
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