auto preheat 12v relay
* Operating within 30 minutes at a time of 4.8w, 2.4w can work for a long time
* The relay is normally open, and 4-pin relay type, and rated current is 100A, rated voltage is 12VDC
* Adopts of copper terminal has good electrical conductivity, and great stable working performance
* Convenient to replace the broken one, and modify the car
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