Blue Sea Heavy Duty Battery Switch Selector The Blue Sea Heavy Duty Battery Switch Selector switches isolated battery banks to all loads or combines battery banks to all loads. The make-before-break contact design allows for switching between battery banks without power interruption. Its case design allows for surface or rear panel mounting. This switch is ignition protected, making it safe for installation aboard gasoline powered boats. Accepts two 40 AWG battery cables. Features Selects batter