Coupling relay in industrial housing 1 changeover contact wide voltage AC/DC 24 V to 240 V spring-loaded connection Coupling relay in industrial housing SIRIUS 3RQ2 for coupling control signals from and to a controller.All 3RQ2 coupling relays have a wide-range voltage input and can therefore be used universally. The reduction in variants leads to cost savings. Even at low currents, contact reliability is high. Removable terminals enable easy device replacement and quick wiring.Devices are available with one to three changeover contacts, with screw or spring-loaded connection (push-in), some also with hard gold-plated contacts for switching small currents.The 3RQ2 coupling relays replace the proven 3RS18 series.SIRIUS relays - a program for all situations.