An Intrinsically-Safe Switch is an isolated UL913 listed device used to interface between hazardous and non-hazardous areas. The input circuitry is designed to never supply excessive energy thus greatly reducing the likelihood of a spark. Provides intrinsically-safe circuits in the following locations: Division 1 and 2, Class I, Groups A, B, C, D; Class II, Groups E, F, G and Class III hazardous locations.