✔【VOLTAGE SENSITIVE RELAY】 Automatic /Manual 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay (VSR) cuts in at 13.3V and cuts out at 12.8V to ensure your primary battery is always charged and ready to start your vehicle. It's like having two separate power sources for each battery while only having one alternator ✔【UNIVERSAL COMPATIBILITY】Like Having Two Separate Power Sources,The Dual Battery Isolator Kit Enables Your Accessories to Run From a Separate Battery While the engine is not running on your vehicle While keeping your Main Battery Charged,power up any ground or marine vehicle including ATVs, boats, cars, mini-vans, trucks, RVs, and yachts; Perfect versatile solution for all automotive power needs ✔【EASY TO INSTALL】The VSR split charge relay kit comes with full installation accessories and cables (battery cables, battery terminals, copper lugs, heat shrinks, cable ties) that make it easy for users to install it independently to vehicles, boats, recreational vehicles, and other equipment ✔【SAFE&EFFICIENT 】The dual battery isolator efficiently manages and protects power, preventing over-discharge of the main battery and ensuring full charging of the second battery. With high-quality materials and an IP68 waterproof, dustproof, and vibration-proof construction, our battery isolator delivers reliable performance even in harsh environments ✔【WIDELY USED】Can be widely used in campers, recreational vehicles, trucks, caravans, etc., very practical. It can meet your off-road needs even in dusty, wet and unexpected extreme weather conditions ASIN B0CMTTHGZG Brand Name AULESSE Unit Count 1.0 Count Part Number sku6197-ysus Contact Type Normally Open Manufacturer AULESSE Mounting Type DIN Rail Mount Connector Type Crimp Current Rating 140 Amps Operation Mode Automatic Contact Material Silver Specification Met Ip68 Number of Terminals 2 Contact Current Rating 140 Amps Minimum Switching Voltage 13.3 Volts