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Circuits designed by David Johnson, P.E.
Last Updated on: Tuesday, April 01, 2014 04:30 AM

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More  Alarm Circuits     Current Monitors

Pump Motor Monitor


This circuit can turn on a light or sound a beeper, whenever an AC line powered pump motor turns on.  It is designed to detect the motor current using a small inductor placed on the outside of the motor’s power cable.  No direct wire contact is needed.

Click on Drawing Below to view PDF version of Schematic

Circuit Pump Motor Monitor designed by David Johnson, P.E. (Nov 18, 2004)

More  Alarm Circuits     Current Monitors

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