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Voltage Sensitive Relay (VSR)


Voltage Sensitive Relay (VSR)


VSR (Voltage Sensitive Relay) oe 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
  • No voltage drop comparing to battery isolator diodes (0.6v)
  • Dimensions fit Heavy Duty Modular Fuse Box Series (BF43xx) and Battery Switch
  • Robust Glass Fibre reinforced Nylon enclosure
  • Built-In LED function (On when VSR engages)
  • Port for remote LED indicating VSR status (LED not included)
  • Surface or Panel Mount options provides flexibility when installing


  • Normal Voltage: DC 12v
  • Combine / Open Voltage: DC 13.7v / 12.8v
  • Continuous Current Rating: 125A
  • Intermittent Current Rating: 140A
  • Power Consumption: 10mA (Standby) / 33mA (Engaged)

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