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Is It Normal for a Car Relay to Get Hot?

1 Answers

VanAlexandra

07/30/25 2:19am

It is not normal for a car relay to get hot. Here are the relevant details: 1. Causes circuit failure: Overheating indicates that the relay has reached the end of its service life and should be replaced promptly. Otherwise, due to excessive contact resistance, further oxidation may occur, leading to circuit failure, and the overheating issue will worsen. 2. Precautions: For AC-spec relays, the voltage should not drop below 90% of the rated voltage. For DC-spec relays, the voltage should not drop below 79% of the rated voltage, and high-frequency switching should be avoided. Design the circuit safely to prevent currents exceeding the contact's rated capacity from flowing through the contact circuit. Do not apply voltages higher than the rated voltage to the coil.

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