Siemens SIRIUS 3RQ2 are coupling relays in a 22.5 mm industrial enclosure with a wide control supply range of 24–240 V AC/DC and 1, 2 or 3 changeover (CO) contacts. They replace the former 3RS18 coupling relays; the table shows the old codes for each version.
Technical data
| Dimensions (W × H × D) | 22.5 × 100 × 90 mm |
|---|---|
| Control supply voltage | 24–240 V AC (50/60 Hz) / DC |
| Operating range | 0.7–1.1 × Uc |
| Thermal current | max. 5 A |
| Output relay capacity | AC-15 250 V: 3 A · DC-13 24 V: 1 A, 125 V: 0.2 A, 250 V: 0.1 A |
| Mechanical endurance | 10,000,000 operating cycles (typical) |
| Electrical endurance (AC-15, 230 V) | 100,000 operating cycles (typical) |
| Ambient temperature | Operation −40…+60 °C |
| Degree of protection | IP20 |
Article numbers
| Contacts | Contact material | Screw | Spring-loaded (push-in) | Replaces former 3RS18 codes |
|---|---|---|---|---|
| 1 CO | AgSnO2 | 3RQ2000-1AW00 | 3RQ2000-2AW00 | 3RS1800-1AQ00 / -2AQ00, 3RS1800-1AP00 / -2AP00 |
| 2 CO | AgSnO2 | 3RQ2000-1BW00 | 3RQ2000-2BW00 | 3RS1800-1BW00 / -2BW00, 3RS1800-1BQ00 / -2BQ00, 3RS1800-1BP00 / -2BP00 |
| 3 CO | AgSnO2 | 3RQ2000-1CW00 | 3RQ2000-2CW00 | 3RS1800-1HW00 / -2HW00, 3RS1800-1HQ00 / -2HQ00, 3RS1800-1HP00 / -2HP00 |
| 3 CO | AgNi + Au (hard gold-plated) | 3RQ2000-1CW01 | 3RQ2000-2CW01 | 3RS1800-1HW01 / -2HW01, 3RS1800-1HQ01 / -2HQ01, 3RS1800-1HP01 / -2HP01 |
Technical data and article numbers are based on Siemens catalog IC 10 · 2026 (chapter 5, contactor relays and relays) and are for information only. Image is representative.
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Tags: 3RQ2, siemens coupling relay, 3RS18 replacement, interface relay, 3RQ2000-1AW00, 3RQ2000-2AW00, 3RS1800-1AQ00, 3RS1800-1AP00, 3RQ2000-1BW00, 3RQ2000-2BW00, 3RS1800-1BW00, 3RS1800-1BQ00, 3RS1800-1BP00, 3RQ2000-1CW00, 3RQ2000-2CW00, 3RS1800-1HW00, 3RS1800-1HQ00, 3RS1800-1HP00, 3RQ2000-1CW01, 3RQ2000-2CW01, 3RS1800-1HW01, 3RS1800-1HQ01, 3RS1800-1HP01