30.3500-01, Battery cut-off relay electronic +12V/140A, ACV

Battery cut-off relay

Electronic cut-off relay for installing a second battery in vehicles.

No alternator control voltage or ignition clamp 15 is required for installation.

When the alternator is running and the on-board voltage is +13.3V or higher, the second battery is connected without voltage peaks via the relay electronics of the cut-off relay.
At an on-board voltage of less than +12.8V, the second battery is disconnected from the starter battery.

This prevents the starter battery from discharging when the second battery is used.

The relay works bi-directionally.

When charging the second battery with a charger, the starter battery is also charged from an on-board voltage of +13.5V.

Note:

black: GND terminal 31 car body.

+S: M6 starter battery terminal 30 next to GND connection
+A: M6 second battery terminal 30

fuse protection for the supply cables depends on the cross-section:

starter battery > cable length to fuse 10 cm max.
second battery > cable length to fuse 10 cm max.

Use case:

Installation of secondary batteries

vehicles
motorhomes
Car-Hifi

Technical data:

Relay: electronic NC (normaly open)
Control LED: voltage +13.5V on / +12.6V off
Switching current: 140A max.
Battery voltage: +12V DC
Switching voltage on/close: +13.3V DC
Switching voltage drop-out/open: +12.8V DC

Dimensions: 67.5 mm x 67.5 mm x 54.5 mm