Latching Relay on -ve Battery Terminal

[Ducatian]

Checking out my 2019 Fiat Ducato base for a B2B install and came acoss this.
A dual coil latching relay making/breaking the main -ve terminal link to chassis gound. Never come across this before. Can someone tell me why it's there and when does it break the link please?

 

[autorouter]

It's used to isolate the battery if you want, for whatever reason, such as if it's laid up in storage. I'm not sure of exactly how to activate the relay, but I believe it's something to do with the ignition key, perhaps a small button to allow it to be turned to an extra position.

 

[Ducatian]

It's used to isolate the battery if you want, for whatever reason, such as if it's laid up in storage. I'm not sure of exactly how to activate the relay, but I believe it's something to do with the ignition key, perhaps a small button to allow it to be turned to an extra position.

Brilliant. With your pointer, I found the little gate on the ingition switch.
Thank you!