Here’s a link to what we are talking about on the acr. The switch also has 4 studs instead of 3. But both exist and will work fine if don properly.
https://www.bluesea.com/systems/42/2...ctrical_System
The acr separates them discharging and combines when charging.
Here’s a helpful video with graphics.
https://www.youtube.com/watch?v=vPhD7fgYq3w