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12V Voltage Sensitive Relay - 140 amp

SKU: 4015

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140 amp Voltage Sensitive Relay charges two 12V batteries from the vehicle alternator
Excl. Tax: £32.08 Incl. Tax: £38.50
Manufacturer: Portable Power

Devon 4x4

Specialist 4x4 vehicle company

4x4 Accessories & 4x4 Spares

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Product Description


This simple device allows the charging of two separate battery banks from a single charging source such as vehicle alternator with no risk of flattening your battery bank.

By sensing the main battery voltage, the VSR (voltage sensitive relay) will only connect the secondary bank to the source when the first bank is fully charged and is 13.7V or over and will cut out if the main bank falls below 12.8V. This ensures thats secondary bank can never drain the main bank.

Dual sense allows the unit to sense the voltage of both batteries that it is connected between. If either battery is receiving a charge the VSR will activate. This allows the charging of the second battery from an external battery charger or second charging source.

The VSR can handle charging currents up to 140A with zero voltage drop, no moving parts and encapsulated design makes it suitable for marine applications as well as split charging systems in vehicles.

Direct alternative to the Durite 140A VSR

Complete with E Mark approval


  • Charges two x 12V batteries from one engine
  • E-Mark Approval - Exclusive to Portable Power Technology
  • 140 amps rating
  • Automatic control
  • Dual sense - Allows secondary charging source on the auxilary battery bank
  • Eliminates draining from starter battery
  • Protects sensitive electronic equipment from harmful engine start up spikes
  • Compact size
  • Easy to install
  • Waterproof


  • Continuous Rating : 12VDC/140 amps
  • Sense: Dual
  • Engage Voltage: 13.7VDC
  • Disengage Voltage: 12.8VDC
  • Ignition Protected: UL1107
  • Stud: M6
  • Ground : Negative, 0.5M/18 AWG wire
  • Weight: 0.2Kg
  • Dimensions: 68mm x 68mm x 49mm
  • Mounting Screws: 4.8 x 50mm and 3.5 x 13mm

Additional Information

Additional Information

export no
Collection Only No
Manufacturer Portable Power
Vehicle Make Audi, BMW, Citroen, Dacia, Daihatsu, Dodge, Fiat, Ford, Foton, GMC, Great Wall, Holden, Hummer, Hyundai, Isuzu, Jeep, Kia, Lada, Land Rover, Landrover, Mahindra, Man, Mazda, Mercedes, Mitsubishi, Nissan, Peugeot, Renault, Santana, Skoda, Ssangyong, Subaru, Suzuki, Toyota, Vauxhall / Opel, Volkswagen, Volvo
Vehicle Model 101 Forward Control, 350, 4Runner, 4runner, Actyon, Alaskan, Amarok, Amigo, ASX, Brava, Bravo, BT-50, Bundera, Caddy, Caddy III, Captur, Challenger, Cherokee, Cherokee KJ, CJ5, CJ6, CJ7, CJ8, Colorado, Colorado 7, Colorado 7 & Trailblazer, Combo, Commander, Compass, County, Courier, Courier Van, Crafter, Crafter, Crafter Van, CX-5, CX-7, CX-9, D, D-max, D-Max, Dakota V6


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