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Voltage Sensitive Relay (VSR)


Voltage Sensitive Relay (VSR)


VSR (Voltage Sensitive Relay) or ACR (Automatic Charging Relay) are automatically controlled switches that allow two batteries to be combined when charging, and to be isolated when not charging and current is draining from one of the batteries. When used with battery switches, a VSR helps to reserve a fully charged battery at all time, avoiding a dead battery at sea.


  • Automatically combines two batteries when charging and isolates the two batteries when not charging
  • Footprint dimensions similar to battery switches
  • Robust Glass Fibre reinforced Nylon enclosure
  • Built-In LED function (On when VSR engages)
  • Manual Override capability
  • Surge protected circuits
  • Silver tipped contacts
  • Surface mounted complete with stainless self tapping screws


  • Normal Voltage: DC 12v
  • Combine / Open Voltage: DC 13.3v / 12.8v
  • Continuous Current Rating: 125A
  • Intermittent Current Rating: 140A
  • Power Consumption: 10mA (Standby) / 33mA (Engaged)
  • IATF 16949-2016 & CE Certified
  • IP65 rated one piece body with potted rear and cover

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