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Before today, we probably would have said that scratch-built relay computers were the sole domain of only the most wizardly of graybeards. But this impressive build sent in by [Will Dana] shows ...

These relays detect current changes in the system and can promptly trigger circuit breakers or reclosers, thereby preventing short-circuit faults or other abnormal conditions from causing greater ...

When the liquid level falls beyond the longer (lower) electrode, the relay circuit is interrupted and the pump motor automatically stops. The motor is not restarted until the level reaches the ...