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What causes an electrical contactor to make a buzzing noise when activated and what should be done about it?
Wiki User
∙ 13y ago
Contactor chatter can be caused by a broken shading ring winding on the pole face of the contactor. Low voltage to the coil can be another reason for contactor chatter. A constant hum on a contactor will be caused by misalignment to the two pole faces. Check for rust building up on the two surfaces.
Wiki User
∙ 13y ago
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