12V 140 Amp Smart Battery Isolator Voltage Sense Relay VSR with LED Display Osram Here we have 100 x

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12V 140 Amp Smart Battery Isolator Voltage Sense Relay VSR with LED Display Osram Here we have 100 xDescription OUHOUG Digital Voltmeter Display Voltage sensitive relays, or VSRs, sense the voltage of the starter battery and close the contacts inside the relay at a pre set threshold 13. 3V . The contacts then open again at a pre set lower threshold 12. 8V. So when the alternator starts turning the voltage rises to around 13. 3V or higher at the starter battery terminals (assuming the battery is already well charged) and the relay will close to allow