Smart Battery Isolator Relay 140A 12V - Kit Our advanced voltage sensitive relay (VSR) automatically manages power distribution between the starter battery and the auxiliary battery. It engages at 13.3 V (LED ON) for efficient charging and disconnects at 12.8 V (LED OFF) to protect the starter battery from deep discharge. When the engine is running, both batteries are connected once the correct charging voltage is reached. When the vehicle is switched off and the voltage drops, the batteries are automatically isolated, ensuring the starter battery is always ready. Reliable electrical protection The system protects the vehicles electrical system against overload, short circuit and overcharging, increasing both battery life and operational reliability. Suitable for most 12V systems, including: Cars ATV and UTV Boats and marine vehicles Motorhomes and caravans Trucks Specifications: Type: Smart dual battery isolator Voltage: 12V Current rating: 140A Engage voltage: 13.3V (LED ON) Disenga