Siemens 3RH2911-1HA12 (SIRIUS 3RH2 control relays / auxiliary switches): auxiliary switch, on the front, 1 NO + 2 NC, .1/.2, .1/.2, .3/.4, –/–, current path: 1 NC, 1 NC, 1 NO, –, screw terminal, for contactors 3RT2 and contactor relays 3RH2.
They share the size S00 housing and accessories of the 3RT2 contactors, so the same snap-on auxiliary blocks and surge suppressors fit.
See our Siemens range.
Technical data
| Siemens order number | 3RH2911-1HA12 |
|---|---|
| Product type designation | 3RH29 |
| Ambient temperature (operation) | -25 … +60 °C |
| Dimensions (W x H x D) | 36 x 37.5 x 43.7 mm |
| Weight, approx. | 0.049 kg |
| Condition | New, original Siemens |
Key features (per Siemens)
- Auxiliary switch
- On the front
- 1 NO + 2 NC, .1/.2, .1/.2, .3/.4, –/–
- Current path: 1 NC
- 1 NC
- 1 NO, —
- Screw terminal
- For contactors 3RT2 and contactor relays 3RH2
Typical applications
- Replacement of a worn relay or block
- Control circuits and interlocking
- Signalling and auxiliary functions on 3RT2 contactors
- Contact multiplication for PLC outputs
Compatibility and replacement
Check the coil voltage (for contactor relays) or the contactor size (for auxiliary blocks) against the old part before ordering.
Replacement checklist
- Look for signs of overvoltage, water or heat damage in the cabinet so the new part does not fail for the same reason.
- Back up the program and parameters from the old device if it still runs.
- Check the supply voltage and wiring of the old unit before installing the new one.
Frequently asked questions
What contacts does it have?
See the contact arrangement in the Siemens title and table above.
Does it fit 3RT2 contactors?
3RH29 auxiliary switch blocks fit 3RT2 contactors of the sizes listed by Siemens in the data sheet.
Can I get a datasheet?
The official manufacturer datasheet is the source of the technical data above; we can send the PDF with the quotation on request.
Do you supply larger quantities for projects?
Yes. For panel builders and plant projects we quote complete lists; send the bill of materials on WhatsApp or through the inquiry form.
Can I get a price and delivery time?
Prices are quoted on request. Send the order number, quantity and delivery country on WhatsApp and we will reply with price and delivery time; air shipping is usually 5 to 7 days once ready, with a 1-year warranty.
Before you order
Compare the complete order number on the old unit with this page, including the suffix: in most ranges the last characters set the coil voltage, current range or version. If the label is worn, send us a photo and we will identify the part.
Need it fast? Send the order number, quantity and delivery country on WhatsApp or through the inquiry form and we reply with a quotation the same working day. All parts are new and original, covered by a 1-year warranty, and ship worldwide by air in 5 to 7 days once ready (shipping, payment and warranty). Local agents: Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
