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Product series: car relay; contact load: high power; contact switching current: 500A; rated current: 500A; contact switching voltage: 7.8VDC; coil power: 12V DC Auto Start Contactor extends battery life and prevents primary battery discharge Made of water-resistant black plastic, the starter relay is practical, durable and reliable and has a long service life The main function of this product is to turn on. It can be used alone. It can also be used for control. However, this product does not contain an additional control relay. When the controller is connected, it is mainly used in the double battery Each starter relay is checked before sale.Please feel free to contact us if you have any problems with our product