DrewE wrote:
I'm guessing the breakers are different sizes, the little slide needing a smaller breaker (either due to smaller gauge wiring heading towards it--though that's not obvious--or per the slide mechanism maker's specifications). Having them both fed through the large breaker prevents overcorrect if both are operated simultaneously, though I assume there's also a fuse or breaker at the battery end of the incoming power feed wire.
And, I agree with ScottG, that this is a neat and clean installation.
That is the same conclusion I came up with. The supply wire isn't big enough to handle both slides in use simultaneously. So the first breaker on the left would trip since power for both slides passes through it.
I see nobody noticed the right breaker is installed backwards. The copper colored post is for battery power and the other post is for the load.