| 摘要 |
An automatically operating interlock device prevents access to the interior of an electrical cabinet when the device within the cabinet is electrically connected with a power supply. The interlock device is particularly suited for arc resistant circuit breaker cabinets. The circuit breakers within such cabinets typically move from a rearward position within the cabinet, wherein a pair of stabs on the back of the circuit breaker are electrically connected to a corresponding pair of quick disconnects, and a forward position within the stabs are disconnected from the quick disconnects. A levering in assembly including a levering in block controlled by a threaded rod is typically used to move the circuit breaker from one position to the other. The interlock device includes a cam pivotally secured near the forwardmost position of the levering in block, and a locking bar pivotally secured to the cam. The cam is biased so that the locking bar engages the cabinet door. When the levering in block is moved to its forwardmost position, it engages the cam, rotating the cam to withdraw the locking bar from the door.
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