This scheme is used to prevent two Mains or a Generator and a Main or two Generators from being tied together through their own associated switch or breaker. This scheme prevents two switches or breakers from being closed simultaneously.
Initial Conditions: The load is fed from line #1 through breaker #1 which is normally closed with its respective interlock key "A" captive. Breaker #2 is locked open with no interlock key present.
Switching the load to line 2 through breaker 2: Open breaker #1 and lock thereby releasing the "A" key. Use the "A" key to unlock and close breaker #2. Reverse to restore the initial condition.
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