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Where's the best place to connect an on-off switch for a 3 phase air compressor circuit?
I know some pressure switches come with an on-off switch built-in, but this one doesn't. Would it be best to wire in a switch to disconnect the pressur switch from the contactor's coil or wire in a swtich to disconnect line power from one of the contactor coils?
Example:
Pressure switch -> toggle switch -> contactor coil
or
Line -> toggle switch -> contactor coil
1 Answer
- 9 years agoFavorite Answer
This would depend on the setup and type of coil or starter you have. Is this on off switch going to be used to start your compressor or just interrupt current to compressor? You can hook Start/stop or on/off switches to the coil, but to do so you would have to have control voltage for switch. Being three phase I will guess that you are messing with probably 480 so you would have to make sure your switch is regulated for 480 or just run 110 to coil if you have 110 control switch.
If you are trying to interrupt current you can just simply wire in switch to the load side of the coil.
Source(s): 13 years as an industrial electrician