Coil temperature standards for AC contactors
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Recently, a batch of contactors in the factory have been overheating, and it is the coil part of these contactors that is getting hot. Replacing it with a new one doesn’t solve the problem either; the temperature generally remains around 80–90°C. Could some expert please advise me on what range the coil temperature should be within to be considered normal according to standard requirements?
What brand of contactor is it? Consult the manufacturer; generally, it is normal for the temperature of the contactor to be 10 to 20 degrees higher than the ambient temperature. Also, check whether there is a poor connection in the control circuit, which is causing insufficient voltage for the coil to engage.
NC3-170, Chint’s contactor: Q