I have a 120V coil contactor relay connected to a pump. The pump is connected on the control terminals of the relay. I would like to switch another circuit when the pump circuit is turned on, but this problem has to do with the control circuit. When I energize the circuit, the relay clicks but the pump does not turn on. On the other hand, if I jump the relay (bypass the relay), when I energize the circuit the pump does turn on. I’ve tried two different relays with the same result. Pump is here https://www.pexuniverse.com/armstrong-astro250ci-circulator-pump
Relay is here https://canada.newark.com/carlo-gavazzi/gdp251ss120v/contactor-spst-no-120vac-panel/dp/45Y3714
Electrical – Contactor relay connected to circulating pump not working
electrical
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Best Answer
It sounds (and looks) like you've put the relay coil in SERIES with the pump, not in PARALLEL with the pump. Correct that and both should work as expected.
So, hot from whatever turns the pump on goes to pump and one end of relay coil. The other end of the relay coil goes to neutral, as does the other side of the pump.