The Blue Sea 3001-BSS HD-Series Heavy-Duty On-Off Battery Switch with AFD controls battery isolation and connection between battery banks and electrical loads.Accepts two 4/0 AWG battery cables; Case supports surface or rear-panel mounting.Product Information Manufacturer Part Number 3001-BSS Key Features Accepts two 4/0 AWG battery cables Case supports surface or rear-panel mounting Ignition protected for installation aboard gasoline-powered boats Includes AFD (Alternator Field Disconnect) Switches a single battery to a single load group Meets American Boat and Yacht Council (ABYC) requirements for battery switches .870" (22.01mm) stud length to accept multiple cable terminals 1/2" (M12) Tin-plated copper studs for maximum conductivity and corrosion resistance Specifications Continuous Rating 500A Maximum Voltage 32V DC Positions 2 Switch Type Single Circuit ON-OFF Terminal Stud 1/2 in (M12) Mounting Hole Accept 1/4 in (M6) screw Ingress Protection IP66 Color Grey Alternator Field Disconnect Yes Cranking Rating 1750A (30 sec) Intermittent Rating 900A (5 min) Important InformationWARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.