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In electrical engineering, a relay is a switch that is operated by an electromagnet, while a contactor is a larger and more heavy-duty switch that is typically used for higher power applications. Relays are often used in control circuits to switch smaller loads, while contactors are used for switching larger loads such as motors or heaters.

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∙ 1y ago

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No, there is not any difference between the switching action of a relay and a contactor. Both of these devices are operated by an electro magnetic coil.


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A definite purpose contactor is designed (and rated) for a specific load. So a lighting contactor is one example of a definite purpose contactor. A motor starter contactor is another example. So, a lighting contactor is a definite purpose contactor, but a definite purpose contactor is not necessarily a lighting contactor (it might be a motor starter, for instance).


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The load contactor is what the motor load is usually connected to. The auxiliary contacts are usually used in the stop start remote wiring to seal the mag in. Auxiliary contacts are also used to transmit the status of the contactor to a PLC.

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