Features:It help extend battery life.Universal 12V applications.Prevents primary battery discharge.Made of water resistant black phenolic plastic.The main function of this product is to switch on, it can be used alone, it can be also connected to control to use, but this product does not include additional control relay, and if the controller is connected, it mainly used in the dual battery.Specifications:Product series: auto relayContact load: high powerContact switching current: 500AContact switching voltage: 7.8VDCContact form: transformation typeRated current: 500AProtective features: sealing typeCoil power: 12V DCWeight: 235gCONTACT DATAContact materialAgSn0_27In_20_33Contact form1H(1A)Contact Ratings500AContact Resistance100mMax at 6VDC 1 AMax Switching Current 500AMax Switching Voltage14VDCMax Switching Power 500ALife Expectancy Electrical100,000 Operations(at 30 Operations or minute)Life Expectancy Mechanic10,000,000 OperationsCOIL SPECIFICATIONNominal Voltage (VDC)Coil Resistance()Max Operate Voltage (VDC)Mix Release Voltage (VDC)Max Applicable Voltage (VDC)121681.2149CHARACTERISTICS:Temperature Range-30-80 Vibration Resistance10-55Hz,1.5mmShock Resistance Operations Extremes Damage Limits50g100gHumidity40-85 percent Insulation Resistance100m min at 500vdcSafety StandardDielectric Strength Between Open Contacts2000VAC(for 1 minuter or s)Between Contacts and coil1500VAC(for 1 minuter or s)Operate Time50msRelease Time50msPackage Included:1 x Heavy current relay