Dual Battery Isolator 12V 140A Waterproof Voltage Sensitive Split Charge Relay for Camper Car RV YachtFeatures: This battery isolators are small and suitable for almost anywhere, for ATV, UTV, Boats, RV's,marine vehicle, truck, caravan. The Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same time. When the engine is started and the start battery reaches 13.3 volts, the VSR engages, allowing two battery banks (start and house) to be charged simultaneously. When the voltage drops below 12.8 volts (eg the engine is stopped), the VSR disengages, separating the batteries. This system eliminates the possibility of draining the start battery and protects sensitive electronic equipment powered from the house battery from harmful engine start up spikes. Advantages of fitting a VSR over conventional charge (diode isolators). Easy 3 wire connection at the battery. No need to bypass existing alternator wiring. VSR have no volt drop. Conventional diode isolators incur a minimum of 0.6 volt drop. Compact size - No large heat sink Cost effective solutionQuality products; affordable prices.Specification: Material:ABSSize:Approx.68x52x68mm/2.68x2.05x2.68inContinuous current: 80-100AInstantaneous current: 125ACurrent consumption - charging: 240mACurrent Consumption - Standby: 8mABreakaway Delay: 5-10 secondsRecommended fuse: 80AmpPower stud: M6 copper screw nutSurge Protection: Built-inNet Weight:50gPackage Includes: 1x Dual Battery Isolatornote: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.