Power Distribution Relay: Description and Operation

Battery Cut-off Relay, Location/Task/Design/Function







Location
The battery cutoff relay (K57) is located on the floor of the trunk towards the partition wall next to the vehicle power supply control module (N82/1).

Task
To separate or connect the on-board electrical system battery (G1) and the starter battery (G1/4) in parallel.

Design
The battery cutoff relay (K57) consists of:
- Flat plug connections
- Folding anchor
- Iron core with coil

Function
If the coil with iron core is supplied with power, the folding anchor is moved and the contacts of the main circuit are closed. As soon as the coil is no longer supplied with power, the folding anchor returns to its starting position and the contact is opened again.