Heavy duty die cast zinc constructionEnclosed silver contacts with reliability nibsDiaphragm seals with drainage holesGrounding nibs on the operator casingReliability nibs improve contact reliability even under dry circuit and fine dust conditionsDrainage holes prevent buildup of liquid inside the operator which can prevent operation in freezing environmentsGrounding nibs bite through paint and other coatings to provide secure groundSlow make and breakAll normally closed contacts have positive opening operation, i.e., normally closed contacts are forced open in the event of contact weld or spring breakage6000 operations/hr6562 ft altitudeTwo layer 100% solid thermosetting cathodic epoxy coating