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How does a shading coil in a contactor actually work?

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A shading coil in a contactor is used to hold the AC contactor's pole faces closed during the transition of the voltage through the zero voltage phase of an electrical cycle.

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How do you know what contactor will work on your unit if you have a Trane model TWR042c100b2?

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A shading coil induces currents to create an additional electrical  phase. The coil pauses slightly to control magnetic flux. Delaying  magnetic flux allows for a secondary (MORE)

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  An electrical contactor works like a remote switch, usually to switch higher voltage/current circuits.   A contactor has a set of normally open and/or normally closed (MORE)

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A contactor is an electronically controlled switch that has a coil  and contacts. The contactor coil moves the contacts into position  by energizing the contactor. A contact (MORE)

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