# Siemens 3RH2122-1BB40 Auxiliary Contactor, 24V DC, 2NO + 2NC, Size S00

**URL:** https://aio.lv/en/product--siemens-3rh2122-1bb40--1796260
**Data updated:** 2026-05-18 02:39 (EEST)
**Category:** Miscellaneous repair tools
**Manufacturer:** Siemens
**Manufacturer code:** 3RH2122-1BB40
**EAN:** 4011209786721
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 41.99 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 34.70 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rh2122-1bb40--1796260

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.99 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3RH2122-1BB40 is a high-reliability auxiliary contactor designed for industrial control circuits. Featuring a 24V DC coil, this S00 size device provides 2 normally open (NO) and 2 normally closed (NC) contacts. It is engineered for efficient switching in automation systems, ensuring robust performance and long service life in demanding electrical environments.

## Long description

The Siemens 3RH2122-1BB40 is a high-reliability auxiliary contactor engineered for demanding industrial control and automation applications. Designed in the compact S00 size, this device ensures precise switching operations within electrical control circuits. It features a 24V DC operating coil and provides a flexible contact configuration of 2 normally open (NO) and 2 normally closed (NC) contacts, making it a versatile component for managing auxiliary signals in complex systems.
Advantages
This auxiliary contactor stands out due to its robust construction and high operational reliability, which are essential for maintaining consistent performance in industrial environments. Its compact S00 design allows for space-efficient installation in control cabinets, while the standardized contact arrangement simplifies integration into existing automation setups. The device is built to withstand rigorous daily use, offering a long service life and dependable switching cycles that minimize maintenance requirements.
Suitable for
Industrial automation and control systems
Signal processing in electrical panels
Switching auxiliary circuits in machinery
Integration with contactors and motor starters
When it may not be suitable
This device is not intended for switching high-power loads or main motor circuits, as it is specifically designed for auxiliary control signals. It is also not suitable for applications requiring AC coil voltages, as this specific model is strictly engineered for 24V DC operation.
Key specifications
Coil voltage: 24V DC
Contact configuration: 2 NO + 2 NC
Size: S00
Mounting type: Standard industrial rail or screw mounting
How to use
The contactor should be installed by a qualified professional within a protected control cabinet environment. Ensure the control voltage matches the 24V DC specification before connecting the coil terminals. The auxiliary contacts can be wired into your control logic to trigger secondary devices or provide feedback signals. Always verify that the wiring connections are secure and that the device is mounted in an orientation that allows for proper heat dissipation.
What to consider before purchase
Verify that your control system provides a stable 24V DC power supply.
Check the available space in your control panel to ensure the S00 size fits correctly.
Confirm that the 2 NO and 2 NC contact configuration meets the requirements of your specific control logic.
Usage recommendations
For optimal performance and longevity, ensure the device is operated within the specified environmental temperature ranges and protected from excessive dust or moisture. Regularly inspect terminal connections for tightness during routine maintenance cycles.

## FAQ

### How much does the Siemens 3RH2122-1BB40 Auxiliary Contactor cost, and is it available for purchase?

The price is 41.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 54 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 14.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Siemens products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Siemens service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

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