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 relay Contact load: high power Contact switching current: 500A Contact switching voltage: 7.8VDC Contact form: transformation type Rated current: 500A Protective features: sealing type Coil power: 12V DC Weight: 235g CONTACT DATA Contact material AgSn0_27In_20_33 Contact form 1H(1A) Contact Ratings 500A Contact Resistance 100mMax at 6VDC 1 A Max Switching Current 500A Max Switching Voltage 14VDC Max Switching Power 500A Life Expectancy Electrical 100,000 Operations(at 30 Operations/minute) Life Expectancy Mechanic 10,000,000 Operations COIL SPECIFICATION Nominal Voltage (VDC) Coil Resistance() Max Operate Voltage (VDC) Mix Release Voltage (VDC) Max Applicable Voltage (VDC) 12 16 8 1.2 14 9 CHARACTERISTICS: Temperature Range -30~80 Vibration Resistance 10-55Hz,1.5mm Shock Resistance Operations Extremes Damage Limits 50g 100g Humidity 40-85% Insulation Resistance 100m min at 500vdc Safety Standard Dielectric Strength Between Open Contacts 2000VAC(for 1 minuter/s) Between Contacts and coil 1500VAC(for 1 minuter/s) Operate Time 50ms Release Time 50ms Package Included: 1 x Heavy current relay