I would like to use 2 momentary switches to controle a water pump (start stop). When you press start the pump should run until I press stop or there is a power outage. The pump should also be off when the power is back on again until I press start. What type of relay should I use and how should I wire it?
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1question has been asked a number of time. It's called a latching relay. – Marcus Müller Feb 16 '20 at 23:25
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It has to be unlatching too without power so the latching is not using a latching relay – Tony Stewart EE75 Feb 16 '20 at 23:32
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1@MarcusMüller: I might call it a latching relay circuit, rather than just a latching relay. You need a circuit around a normal relay wired so the relay latches itself on, but drops out when the power fails. – Peter Bennett Feb 16 '20 at 23:34
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For a motor, requiring more than 200 watts or so, the relay should have an AC motor power rating. For smaller motors, the current rating should be considerably higher than the full-load rating of the motor to safely handle starting current and disconnecting a stalled motor. – Feb 16 '20 at 23:54
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Does this answer your question? Make a Latching Relay using SPDT Relays – Ariser Feb 17 '20 at 06:28
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A typical motor control switch/relay circuit:
simulate this circuit – Schematic created using CircuitLab
Peter Bennett
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Thank you @Peter Bennett, this is great!!! I really appreciate it a lot. – Morne Feb 17 '20 at 14:38