SIRIUS 3RQ3 coupling relays

featuring a slim, compact design with semiconductor output

3RQ3 coupling relays are ideal for use where space is restricted in control cabinets with short gaps between tiers, or in flat control boxes. Their appearance is consistent with that of other SIEMENS devices in the control cabinet. SIRIUS 3RQ3 coupling relays can be wired simply and efficiently and offer screw-type and spring-loaded terminals (push-in technology) as well as an integrated jumper option for all potentials.

The advantages at a glance


  • Fast and reliable wiring thanks to uniform screw wiring and “TOP” wiring for spring-type push-in terminals

  • Low space required in the control cabinet thanks to universal width of 6.2 mm

  • Reduced stock keeping resulting from reduction in number of variants

  • Clearly visible functional state of relay coupler by green LED

  • Uniform accessories for all 3RQ3 variants

  • Universal bridging option using connecting combs for all terminals

  • Galvanic isolation plate for isolating different voltages for neighboring units

  • “Clip-on” labels for individual inscription

Permanently soldered relays

  • For increased contact reliability

Plug-in relays

  • Fast relay replacement in the event of wear due to high switching frequency with permanent wiring

  • Tested, complete units reduce installation times

  • Optional device versions with hard gold-plated contacts for high level of contact reliability

  • Individual relays available as components