Voltage Sensitive Relay (VSR):
Series: 8556 VSR
The 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.
When the voltage drops below 12.8 volts (eg the engine is stopped), the VSR disengages, separating the batteries.
This system eliminates the possibility of draining the start battery and protects sensitive electronic equipment powered from the auxiliary battery from harmful engine start up spikes.

Hella Marine |
Degree of Protection |
IP 56 |
Dimensions |
69 x 69 x 51mm (W x D x H) |
Housing Description |
Impact resistant plastic |
Max. load 12V |
125 A continuous (140 A intermittent) |
Termination Stud Size |
2 x 6mm (1/4'') |
Voltage |
12V DC |