@3-HL Thanks for the answer. The "Hot Battery Bus" I would think of as the "tie bus." A tie bus was usually broken in the center, but kept powered from either end with the load roughly divided in half. The tie could only be closed if one of the sources was open. The double ends were sourced from two independent power company lines. They are a bit unusual, and at the customer level usually operated manually.
How's that song go... "Ya gotta know the jargon..." No, "territory." OE
PS-- GE offers only mechanical latching at 400 amps and up. It's electric release of latching. Of course, that's 3-pole stuff from GE. Below 400, latching comes as a kit, field installed, with a separate part number and price.