Marine construction. Plated steel case with added plastic coating. Insulated SPST, normally open. One circuit: Off/On. Bracket mounting holes 5/16″ x 19/32″ on 2-13/64″ centers. Copper contacts and platicized steel housing. Continuous duty: 65A at 12V DC. Intermittent duty 750A make, 100A break. 10 sec. on, 30 min. off.