12V 125A Fully Automatic Charging Relay Dual Battery Isolator (VSR) Fully with Emergency Override, Voltage Sensitive Relay VSR Automatic Charge, Help Avoid Dead Battery
Brand: CONRAL

Functional Features Example:
After the engine stalls, the left House battery discharges to the upper left load device,and the VSR disconnects when the battery voltage drops below 12.8V.
The Start Battery on the right will not discharge to the device
When the battery on your left is not charging, it is used up.
At least there is a little battery on the right that allows you to start the engine
Surface or panel mount options provides flexibility when installing
Optional Storage Mode allows zero power consumption when engine is off.
（When you do not need this device (VSR) function, you can cut off the red line and connect an ON-OFF switch to control the device's power off.
Normally, if the boat or yacht is not used for a long time, turn off the VSR to achieve zero power consumption when it is not used for a long time)
Specification:
Nominal Voltage | DC 12V
Combine / Open Voltage | DC 13.3V / 12.8V
Continuous Current Rating | 125A
Intermittent Current Rating | 140A
Power Consumption | 10mA (Standby) / 330mA (Engage) / 0mA (Storage Mode)
Certification：CE IP67
Packing list:
1 x Voltage sensitive relay (VSR)
4 x Screws
1 x English Manual

✔ A voltage sensitive relay (VSR) is the best way to ensure you can always get your dual-battery vehicle started.
✔ Automatically combines two batteries when charging and isolates the two batteries when not charging.
✔ Built-in LED indication (ON when VSR engages)
✔ Dimensions fits Heavy Duty Modular Fuse Box Series (BF43x) and Battery Switch, matching mainstream products in market
✔ Robust Glass Fiber reinforced Nylon enclosure