$57.50 per ea

Quantity Price
ea $57.50
2+ $51.75
4+ $45.95
per ea
All prices shown are (inc. GST)


This voltage sensitive relay module is designed to combine two batteries when charging and isolates each when not charging. It essentially isolates your auxiliary battery from your starter battery to prevent you inadvertantly fully discharging it (and thus leaving your car stranded!). Once the voltage of your starter battery rises above 13.3V the isolator engages to charge both batteries in parallel. When the voltage of the starter battery drops below 12.8V the isolator disengages sending charge solely to the starter battery. Fully encapsulated design seals our water and dust.


  • Batteries combined’ LED indicator
  • Glass fibre reinforced nylon enclosure
  • Encapsulated for water and dust protection
  • No voltage drop
  • Surface or panel mount

Information & Downloads


  • Max output current: 140A
  • Continuous output current: 125A
  • Voltage drop: None
  • Nominal voltage: 12V DC
  • Combine/open voltage: 13.7V/12.8V
  • Power consumption: 10mA standby, 330mA engaged, 0mA storage mode
  • Dimensions: 69 x 69 x 58mm
    • *Specifications are subject to change without notice.

Warranty & Returns


We offer 12 months warranty on this product from its date of purchase. This is available from Altronics stores, online purchases or Altronics resellers. In accordance with our full warranty terms we will repair, replace or refund if goods you have purchased from us are defective.


Not withstanding our warranty policy, if you are dissatisfied with our goods or service you may return the goods within 14 days of our despatch date. Simply contact us for a return authorisation number and we will refund your purchase in full, less transport costs on receipt of goods. All returned goods must be in as sold condition including all packaging, instructions, invoices etc.