“Force-guided” means that the integrated contacts of the coupling relays are mechanically connected to each other. Therefore, normally open (NO) and normally closed (NC) contacts can never be closed at the same time. This allows for fast and precise diagnostics when monitoring the force-guided feedback contact: an opening failure is detected immediately, and faulty switching is avoided.
The coupling relays offer additional safety as an output expansion of the Sirius 3SK series safety relays using a device connector. This reliably prevents wiring errors and protects against electrical accidents and damage during assembly. At the same time, the new relays save valuable time when building control panels.
Thanks to removable screw-type or spring-type (push-in)
terminals, installers can wire the coupling relays while standing. This allows
the devices to be replaced quickly, eliminating the need to recheck the wiring.
Sirius 3RQ1 coupling relays have functional safety
certification up to SIL 3 / PL e (IEC 61508 / ISO 13849) as well as approvals
for shipbuilding and railroad applications. In addition, they comply with all
common international standards, including CE, UL/CSA, EAC, and CCC.