What is the problem when a car relay becomes hot to the touch?

1 Answers
MacLilliana
07/29/25 7:09pm
Abnormal heating occurs at the center of the contact point due to continuous arcing caused by repeated switching of the contacts. The internal circuit of the relay experiences phenomena such as fusing and contact melting/solidification. This may be caused by abnormal overcurrent exceeding the rated current of the contacts. Partial short-circuiting of the coil leads to fusing, coil breakage, or abnormal residual heating traces on the coil. This might result from excessive voltage being applied to the coil.
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