12V VOLTAGE SENSITIVE RELAY

Voltage Sensitive 12V Relay

A 12V Voltage Sensitive Relay (VSR) is an automatic battery management device designed to charge multiple batteries from a single charging source while preventing unwanted battery drain. Commonly used in cars, campervans, motorhomes, boats, and 4x4 vehicles, a VSR monitors battery voltage and automatically connects a secondary battery when the charging voltage rises, then disconnects it when the voltage drops.

This intelligent operation ensures that the starter battery remains protected while allowing an auxiliary or leisure battery to be charged efficiently. Easy to install and highly reliable, a 12V voltage sensitive relay eliminates the need for manual switching and helps maximise battery performance and lifespan.

Key Features

• Automatic battery charging management
• Suitable for 12V electrical systems
• Protects the starter battery from discharge
• Charges auxiliary and leisure batteries efficiently
• Voltage-sensitive automatic connect/disconnect operation
• Compact, durable, and easy to install
• Ideal for automotive, marine, and leisure applications

Applications

• Campervans and motorhomes
• Boats and marine systems
• 4x4 and off-road vehicles
• Commercial vehicles
• Dual battery installations
• Leisure battery charging systems