Blue Sea M Series Battery Switch - 3-Position This Blue Sea M Series Battery Switch - 3-Position is ignition protected making it safe for installation aboard gasoline powered boats. It switches a single battery to a single load group. The case design allows for surface or rear panel mounting. This 3-Position M series battery switch is an ideal choice among many. Features Case Design Allows For Surface Or Rear Panel Mounting Ignition Protected Safe For Installation Aboard Gasoline Powered Boats S