Forced-guided coupling relay in an industrial housing 1 normally open contact / 1 normally closed contact 24 V to 240 V AC/DC SIL 3 / PL e screw connection Forced-guided coupling relay SIRIUS 3RQ1 for fail-safe coupling of control signals from and to a controller and for contact extension of 3SK safety relays. The force-guided 3RQ1 coupling relays have safety certification and can be connected to 3SK safety relays. Thanks to the wide-range voltage input, they can be used universally. Removable terminals enable easy device replacement and quick wiring. Devices are available with safety certification up to SIL 3/PL e, with single and wide voltage ranges, various contact designs, also in a width of 17.5 mm, each with screw or spring-loaded connection (push-in). SIRIUS relays - a program for all cases.