Order number 3RH2911-1HA20 is a genuine Siemens part from the SIRIUS 3RH2 control relays / auxiliary switches range. Official description: auxiliary switch, on the front, 2 NO, .3/.4, .3/.4, –/–, –/–, current path: 1 NO, 1 NO, –, –, screw terminal, for contactors 3RT2 and contactor relays 3RH2.
SIRIUS 3RH2 contactor relays and auxiliary switch blocks are used in control circuits to multiply contacts, interlock starters and interface PLC outputs with higher-power coils.
See our Siemens range.
Technical data
| Siemens order number | 3RH2911-1HA20 |
|---|---|
| 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. | 0.045 kg |
| Condition | New, original Siemens |
Main features
- Auxiliary switch
- On the front
- 2 NO, .3/.4, .3/.4, –/–, –/–
- Current path: 1 NO
- 1 NO, –, —
- Screw terminal
- For contactors 3RT2 and contactor relays 3RH2
Typical applications
- Contact multiplication for PLC outputs
- Control circuits and interlocking
- Signalling and auxiliary functions on 3RT2 contactors
- Replacement of a worn relay or block
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
- Note the firmware version printed on the old unit; TIA Portal or LOGO! Soft Comfort must support it.
- Look for signs of overvoltage, water or heat damage in the cabinet so the new part does not fail for the same reason.
- Compare the full order number 3RH2911-1HA20 with the label on the old unit, including the last digits (they identify the version).
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.
Is it new and original?
Yes. We supply new, original parts in the manufacturer packaging, with a 1-year warranty.
Do you ship to my country, and what is the warranty?
Yes. RendatSP ships worldwide from Yiwu, China, by air in 5 to 7 days once the part is ready, and every part carries a 1-year warranty. Send the order number and quantity on WhatsApp and we will reply with a quotation.
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.
