FeaturesHeavy duty zinc die cast 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 break contact operation (positive opening NC contacts) for improved safetyAll cast enclosures can be converted to base mounting of contact blocks, when used with E30 pushbuttons only the one element enclosure can be used