High Quality & DurableDual battery smart isolator has a rugged housing for extreme environments, waterproof, shockproofdustproof and moisture resistant, and has surge protected, keeping your vehicle and battery safe from unexpected surges. LED Light Design Built-in LED indication light (ON when VSR starts). It also has a remote LED port that indicates the status of the VSR. Voltage Sensitive RelayThe 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. Zero Voltage DropDual battery Isolator is the only unit designed with cutting edge programming to deliver optimum performance. 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. Widely UseThis battery isolators are small and suitable for almost anywhere, for ATV, UTV, Boats, RV'smarine vehicle, truck, caravan Specification Type: 24V voltage sensitive relay Continuous current: 100-120A Instantaneous current: 160A Current consumption-charging: 250mA Current consumption-standby: 8mA With anti-reverse function Ambient temperature: -2050 Departure delay: 5-10 seconds Recommended fuse: 80Amp Power stud: M6 copper screw nut Surge protection: built-in Dimensions: 68x52x68 mm Feature High Quality 24V 100A Split Charge VSR 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. Voltage sensitive relay24 volt 100 ampRed LED indicator.Allows split charging of the 2nd battery bank without discharging the primary/start battery.The relay makes at 13.3 volts and breaks at 12.8 volt. 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 Packing Included1pcs x 24V 100A Voltage Sensitive Relay VSR