| Automotive Dual-Battery System Digital Display Voltage Sensitive Relay Isolator Split Charge Protection 12V 140A Material: Nylon Color: Black Nominal Voltage: DC 12V Combine Voltage: DC 13.3V Open Voltage: DC 12.8V Continuous Rating: DC 125A Intermittent Rating: DC 140A Power Consumption: 10mA (Standby)/ 330mA(Engage) / 0mA (Storage) Terminal Studs|: M6(1/4") Waterproof Level: IP65 Description: A VSR is a relay that separates the car's main cranking battery and the secondary accessories battery. The VSR is triggered by detecting when the alternator is running and charging the car battery. When the VSR detects that the car is on, it says "Hey the car's on! OK let's connect the two batteries". Thus, your secondary battery starts charging. The advantages of a VSR are that you get the potential full advantages of a dual battery system, that a) if the car is off and you're powering accessories, you won't drain your main battery, and b) if you need (in a pinch) to use your auxiliary battery to crank the car, you can override with the click of a switch. Features: Prevents you from draining the starter battery. Automatically combines two batteries when charging and isolates the two batteries when not charging. Suitable To Install into Camper Van, 4x4 car, Leisure Vehicles & Marine Applications. Not 70 Amp Cable As Per Some Other Similar Priced Kits. No voltage drops compared to battery isolator diodes (0.6V). Meets ISO8846 Ignition Protection, suitable for use in the engine room. Robust Glass Fiber reinforced Nylon enclosure. Built-in LED indication (ON when VSR engages). Surface or panel mount options provide flexibility when installing. Optional Storage Mode allows zero power consumption when the engine is off. Package Includes: 1 x Digital Display Voltage Sensitive Relay |