Mastervolt Charge Mate Pro 40 - Electronics Charge Relay

The Mastervolt Charge Mate Pro 40 – Electronics Charge Relay is designed for modern dual-battery and auxiliary power setups in trucks, RVs, and off-road vehicles. This relay is essential for maintaining independent charging circuits, especially when using winches, auxiliary lighting, or other aftermarket electronics. It ensures that each battery system remains charged under load, making it a critical component for effective vehicle electronics management.

This relay isolates charging pathways between primary and secondary batteries, preventing voltage sag. It operates as a voltage-sensing relay that connects and disconnects charging paths based on electrical demand. Engineered by Mastervolt, a reputable name in automotive electrical systems, this relay is built to handle high-amperage switching while protecting sensitive electronics from charging transients.

The Charge Mate Pro 40 is ideal for experienced mechanics and 4x4 builders upgrading to multi-battery systems. It is particularly beneficial in vehicles equipped with winches, auxiliary compressors, or high-output audio systems that require stable voltage isolation. Its compact design allows for easy installation in tight spaces, such as engine bays or battery boxes.