Mechanical interlocks prevent two power sources from connecting to the load at the same time. It stops handle movement from the “Off” position as long as the other circuit breaker remains in the “On” position. It also does not allow users to disconnect the plug from the circuit breaker in the “On” position. In the event of a power outage, a generator interlock kit shuts off the main breaker. It then turns on the generator and shuts off the generator power before returning to the main breaker. This keeps the people repairing the power lines from getting electrocuted.