Voltage Sensing Relay - 500 Amp Dual Sense with Motorised Emergency Parallel.

VSR features:

Dual battery sensing
Manual override option

Remote emergency parallel function:
Can be operated through a momentary button on the dash and will instigate a preset time of 10 minutes. Once this 10 minutes has passed, if the voltage is up high enough for the voltage sensitive relay to operate, it will stay engaged. If not, it will disengage.

Engine run sensing for 12V version:
Unit will engage when the voltage on either start or house battery reaches 13.7 volts. If the combined battery voltage drops below 13.0 volts and the engine is not running, after 5 seconds the contacts will open and stay open until the start or house battery voltage is greater than 13.7 volts. If the combined battery voltage drops below 12.2 volts and the engine is running, after 5 minutes the contacts will open and stay open until the start or house battery voltage is greater than 13.7 volts. If voltage drops below 13 volts and stays above 12.2 volts on either start or house battery while engine is running, the unit will stay engaged.

Engine run sensing for 24V version:
Unit will engage when the voltage on either start or house battery reaches 27.4 volts. If the combined battery voltage drops below 26.0 volts and the engine is not running, after 5 seconds the contacts will open and stay open until the start or house battery voltage is greater than 27.4 volts. If the combined battery voltage drops below 24.4 volts and the engine is running, after 5 minutes the contacts will open and stay open until the start or house battery voltage is greater than 27.4 volts. If voltage drops below 26 volts and stays above 24.4 volts on either start or house battery while engine is running, the unit will stay engaged.

Technical specs:

Continuous rating: 500 Amps DC
Intermittent rating: 700 Amps DC
Cranking rating: 2500 Amps DC
Operation: On/Off
Mounting: recessed or surface
Ignition protected
Stud size: 2 x 12mm (1/2")
Tin plated copper studs and nuts

Power Draw:
Switch in off position: 12mA
Switch in On position: 15mA
Switch operating: 120mA for 3 Secs

VSR operating voltage:
12V version: 8 to 15 Volts DC
24V version: 15 to 30 Volts DC

Dimensions (mm): 102L x 102W x 110H

Additional item available for VSR:

* Emergency Parallel Switch. This switch can be mounted in the dash of your vehicle to electronically activate the VSR in emergency situations.


Please order either a 12V or 24V version of VSR.