Replacing Safe-T-Alert

[Jackson]

Happy Spring to all from New England. Time to replace our Safe-T-Alert. Unable to discern the correct fuse before removing. Anybody?

Also failing memory on my part. Pictured On/Off switch. Can't recall its use. Seems like always on.

[Merlin]

Master light switch?

Fuse labeling on Camplites is notoriously bad and I have no idea which fuse is used for that in your model. When I replaced my safe t alert, I unplugged shorepower and disconnected the battery negative cable.