Siemens SIRIUS Auxiliary Contact Block 3NO + 1NC Front Mounting Screw Terminal – 3RH2911-1HA31
Siemens SIRIUS Auxiliary Contact Block 3NO + 1NC Front Mounting Screw Terminal – 3RH2911-1HA31
Regular price
$45.00
Sale price
$45.00
Regular price
$65.00
Unit price
per
Tax included.
3RH2911-1HA31
1 in stock
The Siemens SIRIUS 3RH2911-1HA31 is a four-pole auxiliary switch block that snaps onto the front of a 3RT2 contactor or 3RH2 contactor relay, adding three normally-open and one normally-closed contact for interlocking, signalling and control logic. Positively driven operation to IEC 60947-5-1 means the contacts are mechanically tied to the main contactor state—essential where the auxiliary contact is relied on for safe interlocking. Terminal designation follows EN 50012.
Key features
- 3 NO + 1 NC instantaneous contacts (contact sequence 1 NC, 1 NO, 1 NO, 1 NO)
- Front-mounting: snaps onto the base unit without additional rail space
- Fits 3RT2 contactors sizes S00 to S3 and 3RH2 contactor relays
- Screw terminals accepting 0.5–2.5 mm²
- Rated insulation voltage 690 V, thermal current 10 A
- 10 million operating cycles mechanical endurance
- Positively driven operation per IEC 60947-5-1; mirror contact per IEC 60947-4-1
Technical specifications
| Siemens order number | 3RH2911-1HA31 |
| Product designation | Auxiliary switch, on the front, 3 NO + 1 NC, screw terminal |
| Product family | SIRIUS Innovations |
| Contact configuration | 3 NO + 1 NC (4 poles, all instantaneous) |
| Contact sequence | 1 NC, 1 NO, 1 NO, 1 NO |
| Mounting | Front-mounting (snap-on) |
| Terminal designation | per EN 50012 |
| Connection type | Screw terminals |
| Conductor cross-section | 0.5–2.5 mm², solid or stranded |
| Rated insulation voltage (Ui) | 690 V at pollution degree 3 |
| Rated impulse withstand voltage (Uimp) | 6 kV |
| Thermal current (Ith) | 10 A |
| AC-15 rated current | 6 A at 24 V / 6 A at 230 V / 3 A at 400 V / 1 A at 690 V |
| DC-13 rated current | 6 A at 24 V / 2 A at 60 V / 1 A at 110 V / 0.3 A at 220 V / 0.3 A at 250 V |
| Suitable for | 3RT2.1, 3RT2.2, 3RT2.3, 3RT2.4 contactors (sizes S00, S0, S2, S3) and 3RH2 contactor relays |
| Mechanical endurance | 10,000,000 operating cycles |
| Electrical endurance | approx. 200,000 operating cycles (AC-15, 230 V) |
| Dimensions (H × W × D) | 37.5 × 36 × 43.7 mm |
| Degree of protection | IP20 |
| Ambient temperature | –25 to +60 °C in operation; –55 to +80 °C storage |
| Standards | IEC 60947-5-1, IEC 60947-4-1 |
Please note
- Size S00 restriction: per Siemens, on size S00 this block can be mounted to EN 50012 only on base units which have no integrated NC contact. Please check your base unit before ordering.
- This is the SIRIUS Innovations generation accessory, for 3RT2 / 3RH2 base units. The predecessor for older 3RT1 / 3RH1 base units is 3RH1911-1HA31.
- For the spring-loaded (push-in) terminal version of the same contact complement, order 3RH2911-2HA31. Contact us if you need the ring-terminal variant.
