Product OverviewMedium Duty. For use with two or more batteries and single or dual engine systems. Permits selection between batteries for starting and charging or operation of both batteries in parallel. They allow addition of an extra battery for use with accessories. The "OFF" position also acts as an emergency disconnect in the event of an electrical problem. Ignition protected. Surface mount. For use with systems under 50 volts. Capacity - 250 amps continuous, 360 amps intermittent. Size: 5-1/4 dia. x 2-5/8 deep. UL Listed.Specifications Locking: Yes Size: 5-1/4" Dia. x 2-5/8" Type: 1, 2, Both, Off Product Details Brand: Perko Product Type: Battery Management Manufacturer Part Number: 8502DP UPC: 085226559624 LNS Category: Electrical LNS Subcategory: Switches Dimensions: L 7.5 in × W 6.05 in × H 3.3 in Country of Origin: US Compare the manufacturer part number, dimensions, fitment, voltage, material, and included components with your application before ordering.Enjoy free standard shipping on all U.S. orders, including Alaska, Puerto Rico, Guam, U.S. territories and protectorates, and eligible P.O. boxes.