FeaturesCharges two 12V batteries from one engine140 Amps ratingAutomatic controlDual sense - Allows secondary charging source on the auxilary battery bankWaterproofThis simple Portable Power Technology 12V Voltage Sensitive Relay 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 that secondary banks 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 VSRComplete with E Mark approvalApplicationsCommercial Vehicle - Battery management Spilt charging battery systems Mobile Man in a van In-car power