Permits selection between two batteries for starting, charging, or operating both batteries in parallelFor 6, 12, 24 or 36 volt systems230 Amps continuous, 345 amps momentary (5 minutes)Surface or rear mountConforms to US Coast Guard standards for ignition protectionPositive click-stop on all positionsDurable marine-grade polycarbonate case60% Larger ?sweep' contact area for improved performance and longer switch lifeDimensions: 5-1/2" dia. x 2-5/8"; cable lug size: 3/8"Fits most competitors mounting hole patterns