Perko Medium Duty Battery Selector Switch - 250A Continuous. They permit selection between batteries for starting and charging or operation of both batteries in parallel. For use with systems under 50 volts. Use two switches for dual engine systems. When used with Non-Unitized Alternators these models will interrupt the field current (reducing the possibility of damage) if turned "OFF" with the engine running. Capacity: 250 Amps continuous 360 Amps Intermittent. Dimensions: 5-1/2" dia. 2-5/8" depth. Features/Specifications: For use with 12 24 and 32 volt marine electrical systems Capacity - 250 Amps continuous 360 Amps intermittent Ignition protected Built with quality materials Specifications for Perko Medium Duty Battery Selector Switch: Manufacturer: Perko Color: Black Amperage: 250 amps Features of Perko Medium Duty Battery Selector Switch For use with 6 two 50 Volt Marine Electrical Systems Capacity - 250 AMPS Continuous 360 AMPS Intermittent When used with Non-Unitized Alternators these models will interrupt the field current (reducing the possibility of damage) if turned "OFF" with the engine running Specs: Diameter: 5-1/4" Depth: 2-5/8" Package Contents: Perko Medium Duty Battery Selector Switch Perko 8501DP: Medium Duty Battery Selector Switch - 250A Continuous