Interface relays PIR6W include screw terminals and a universal socket with electronic or miniature operational relay—RM699BV or solid state RSR30. Interface relays PIR6WB incorporate spring terminals and a universal socket with electronic or miniature operational relay—RM699BV or solid state RSR30. The PIR6W and PIR6WB relays are designed for direct mounting on 35-mm rail mount, according to UL end CE standards. The relays can be linked with interconnection strip type ZG20 and are equipped in LED green, that signaling the operation status of the relay. For PIR6W and PIR6WB relays, Altech offers separators that provide optical division of groups of the interface relays. In the packaging of the interface relays, there is a single description plate with each interface relay, and there is a movable ejector, for protection and easy replacement of the operational relay.