KickAss 12 Volt 50 amp VSR Relay for Dual Battery System

Compact Design Battery Isolator for Smaller Vehicles and Dual Battery Systems

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The all new KICKASS Mini 50A VSR has been designed to be ultra compact and space saving allowing for quick and easy fitting when installing a dual battery system. Fully automatic operation, these units will cut in at 13.2V with a 15 second delay and cut out or disconnect at 12.8V with a 15 second delay - see more below about the operation of our VSR's.

Three simple connections all it takes to wire these Mini VSR's up, they have an easy to see Red On indicator and are easily surface mounted. Measuring just 85x45x40mm these units can be mounted almost anywhere its size is small enough even to fit into some battery boxes so you could make your own truly portable isolated power pack! So this is a fantastic little device for any dual battery system or custom application.


The purpose of a Voltage Sensitive Relay (VSR) is to isolate the Auxiliary Battery from the Start Battery when there is no charge from the alternator In simple terms, the VSR will automatically disconnect the Auxiliary Battery from your Starter Battery when the engine is not running and then reconnects it when Starter Battery is charged


When the vehicle's engine is running, the alternator will charge the Start Battery. Once the Start Battery has reached 13.20V the isolator will wait 15 seconds then connect the Start and Auxiliary Batteries enabling them to charge simultaneously. When the vehicle's engine is not running, the alternator is no longer charging so the Start Battery voltage will drop. Once the Start Battery voltage is below 12.8V after 15 seconds the VSR will disconnect the Start Battery from the Auxiliary Battery. This means the Auxiliary Battery can NOT drain the Start Battery.

1 Year KickAss Warranty

This product is covered by a 1 Year Australian warranty and easy in-store or online returns.

User Manuals

Download Installation Manual

Detailed Video


Voltage Operates on 12 DC only
Cut-in Voltage 13.2V 
Cut-out Voltage 12.8V 
Continuous Max Current 50A
Current Draw - Charging 250mA
Current Draw - Standby 10mA
Delay Cut In 15 Seconds  / Disconnect 15 Seconds
Voltage Drop Nil
Recommended Fuse 50Amp
Power Studs M6 brass with tin plate
Nuts brass with Nickel plate
Torque Settings 6.0 N M
Surge Protection Built-in
Dimensions  85x45x40mm  (LxWxH)
Weight 170grams



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