Auto Charging Relay 12V - 140 AMP

The 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 drops
• Start 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 120 A
• Dual-color LEDs – provide real-time battery status: Fault, Charging, Discharging, Combine, SI, and Override modes
• Under 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 applications

Specifications:

• Continuous Rating: 120 Amps
• Intermittent Rating: 140 Amps
• Max Voltage: 48VDC
• Cable Size: 4/0 AWG

Applications:

• Boats – dual battery systems (starter + house)
• Sailboats – navigation and lighting batteries
• Fishing boats – trolling motor and accessory battery protection