The Siemens 3RH2122-1BB40 is described by Siemens as: contactor relay, 2 NO + 2 NC, 24 V DC, screw terminal, frame size S00.
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 | 3RH2122-1BB40 |
|---|---|
| Product type designation | 3RH2 |
| Ambient temperature (operation) | -25 … +60 °C |
| Dimensions (W x H x D) | 45 x 57.5 x 73 mm |
| Weight, approx. | 0.259 kg |
| Condition | New, original Siemens |
Main features
- Contactor relay
- 2 NO + 2 NC
- 24 فولت DC
- Screw terminal
- Frame size S00
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.
Before you replace it
- Look for signs of overvoltage, water or heat damage in the cabinet so the new part does not fail for the same reason.
- Check the supply voltage and wiring of the old unit before installing the new one.
- Back up the program and parameters from the old device if it still runs.
Frequently asked questions
Does it fit 3RT2 contactors?
3RH29 auxiliary switch blocks fit 3RT2 contactors of the sizes listed by Siemens in the data sheet.
What contacts does it have?
See the contact arrangement in the Siemens title and table above.
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.
Can you help me identify the right replacement?
Yes. Send us a photo of the label of the old part, or its full order number, and we will confirm the exact match or the official successor before quoting.
How fast can you deliver, and is there a warranty?
Air shipping usually takes 5 to 7 days once the part is ready, to almost any country. Each part is new and original with a 1-year warranty. Message us on WhatsApp with the order number for a quotation.
Ordering tips
Send us the full order number from the label of the old part, or a clear photo of the label, together with the quantity you need. We check the number against the current manufacturer data before we quote and tell you if there is a newer replacement.
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.
