Auto Charging Relay 12V, 140 AMPThe automatic charging relay (ACR) automatically manages battery charging to ensure maximum efficiency and protect your batteries.Features:Automatic battery management connects batteries during charging and isolates them when the voltage dropsStart Isolation (SI) protects sensitive electronics during engine cranking by temporarily disconnecting house loads (indicated by a slow-flashing yellow LED)High-output support compatible with alternators up to 120ADual-color LEDs provide real-time battery status: Fault, Charging, Discharging, Combine, SI, and Override modesUnder Voltage Lockout prevents the relay from closing when battery voltage is too low (9.5V for 12V systems, 19V for 24V systems)Durable design IP67 waterproof, ignition protected, safe for marine and RV applicationsSpecifications:Continuous Rating: 120 AmpsIntermittent Rating: 140 AmpsMax Voltage: 48VDCCable Size: 4/0 AWGApplications:Boats dual battery systems (starter + house)Sailboats navigation and lighting batteriesFishing boats trolling motor and accessory battery protection