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

**URL:** https://aio.lv/en/product--siemens-3rh21222bb40--1801902
**Data updated:** 2026-05-18 02:44 (EEST)
**Category:** Printer & Copier Parts
**Manufacturer:** Siemens
**Manufacturer code:** 3RH21222BB40
**EAN:** 4011209786738
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 43.49 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 35.94 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rh21222bb40--1801902

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3RH2122-2BB40 is a high-reliability auxiliary contactor designed for industrial control circuits. Featuring a 24V DC control supply voltage and size S00 construction, it provides 2 normally open (NO) and 2 normally closed (NC) contacts. This compact switching device is ideal for signal processing and automation systems, ensuring efficient operation in demanding electrical environments.

## Long description

The Siemens 3RH2122-2BB40 is a high-reliability auxiliary contactor engineered for precise control in industrial automation systems. Built in the compact S00 size, this device is designed to handle signal processing tasks with high efficiency. It operates on a 24V DC control supply voltage and features a configuration of 2 normally open (NO) and 2 normally closed (NC) contacts, making it a versatile component for complex electrical switching circuits.
Advantages
This auxiliary contactor offers exceptional durability and consistent performance in demanding industrial environments. Its compact S00 design allows for space-saving installation in control cabinets, while the robust construction ensures long-term reliability for signal switching. The integration of 2NO and 2NC contacts provides flexibility for various logic control requirements, ensuring seamless operation within automated systems.
Suitable for
Industrial automation and control circuits
Signal processing applications
Switching auxiliary circuits in electrical panels
Integration into complex relay logic systems
This device may not be suitable for applications requiring high-power switching, as it is designed specifically for auxiliary control signals. It is also not intended for direct motor starting or high-current load management, as its contact ratings are optimized for low-current control tasks.
Key specifications
Control supply voltage: 24V DC
Size: S00
Contact configuration: 2 normally open (NO) and 2 normally closed (NC)
Design: Compact industrial auxiliary contactor
To use the Siemens auxiliary contactor, mount it onto a standard DIN rail or directly onto a compatible contactor within your control panel. Connect the 24V DC control supply to the designated coil terminals. Wire your control signals through the 2NO and 2NC contact blocks according to your specific circuit diagram. Ensure all connections are tightened to the manufacturer's specified torque to maintain electrical integrity.
What to consider before purchase
Verify that your control system operates on a 24V DC supply
Ensure the S00 size fits your existing mounting space
Confirm that the 2NO and 2NC contact configuration meets your logic requirements
Check compatibility with other modular components in your control cabinet
Usage recommendations
Always ensure the power supply is disconnected before performing any wiring or maintenance on the contactor. Regularly inspect the terminals for tightness and ensure the device is kept free from dust and moisture to maintain optimal operational life.

## FAQ

### How much does the Siemens 3RH2122-2BB40 Auxiliary Contactor cost, and is it available for purchase?

The price is 43.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 21 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 06.07.2026 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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