A Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same time. When the engine is started and the start battery reaches 13.7 volts, the VSR engages, allowing two battery banks (start and auxiliary) to be charged simultaneously.
12 Volt 140 Amp
13.3v - 12.8v
Continuous Current Rating 125A
Intermittent Current Rating 140A
Power Consumption 10mA ( Standby )
330mA ( Engage ) 0mA ( Storage Mode )