Heavy duty construction vaporproof, weather-, dust- and corrosion-resistant. Durable, fracture-resistant, high temperature plastic case, knob and insulator. Can be surface mounted or installed through a 3-5/16″ diameter hole in the panel. Flange diameter 6″ and overall height 2-5/8″. Terminals: (3) 3/8″ copper studs. For 6-36V DC systems. Rating: 310 Amps continuous, 500 Amps intermittent. Ignition protected. UL Marine listed.