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This circuit waits 5 minutes before
re-applying the power to a refrigerator to prevent it from having to start up under pressure
after a brief power outage. This is highly stressful for the compressor and the thermal
cut-out switch built into the compressor. This device prevents frequent brief power
interruptions from shortening the life of the refrigerator’s compressor. Central air
conditioning systems already have such a timer built into them.
Note that once the relay is energized, the
timer is shorted out, isolating it from the power line and whatever surges and stresses may be
lurking there.
