Jtron 12V 140Amp Dual Battery Smart Isolator VSR Voltage Sensitive Relay, Automatic Charger & Wiring Cable Kit for Car, Vehicle, RV, ATV, UTV and Boat

Primary Battery Protected: The dual power isolator adopts imported power management chip, which is a new way of intelligent automatic electronic circuit management. With strong water resistance, low loss, good heat dissipation and high efficiency, you have all the benefits you could want. Voltage Sensitive Relay: The KeyLine Automatic 12V 140 Amp Dual Battery Isolator is everything you need to charge two battery systems. The Voltage Sensitive Relay (VSR) turns on at 13.3 volts and off at 12.8 volts to ensure your primary battery is always charged and ready to start your vehicle. Purpose: This voltage-sensitive relay is designed for two battery systems (SUITABLE for acid-lead batteries, NOT SUITABLE for lithium batteries), enables the use of two separate power sources while charging by an alternator, all two battery systems must be charged and isolated. Wide Range of Applications: Used for isolated charging of DC 12V dual battery systems commonly used in automobiles, vehicles, RVs, ATV, UTV, and boats, and can also be used in dual battery electrical equipment. Easy to use: this VSR comes with blue ring cable lugs and 4 screws for installation.