Both of the switches are double pole switches.
The engine switch connects each battery to its respective engine, port battery to port engine, starboard battery to starboard engine, and an emergency combine position where both engines and both engine batteries are connected together.
The house switch is also a double pole switch. It connects the house battery to the house loads. When it is in the emergency combine position it connects the house battery to one of the engine batteries.
When both switches are in emergency combine mode all the batteries are connected to each other.
The panel is designed to be used in conjunction with a pair of 7610 ACR's which automatically combine when any battery is being charged and charge the entire set. For more details refer to the wiring diagram.