# Siemens 3RH2122-2KB40 Auxiliary Contactor, 2NO+2NC, 24V DC, Size S00

**URL:** https://aio.lv/en/product--siemens-3rh21222kb40--1801634
**Data updated:** 2026-05-18 02:44 (EEST)
**Category:** Printer & Copier Parts
**Manufacturer:** Siemens
**Manufacturer code:** 3RH21222KB40
**EAN:** 4011209847095
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 36.99 €
**Prices and availability valid until:** 2026-08-06 23:59
**Price without VAT (21%):** 30.57 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rh21222kb40--1801634

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 27.07.2026 | free |
| Pickup points | 30.07.2026 | 1.89 EUR |
| Courier delivery to door | 30.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3RH2122-2KB40 is a high-reliability auxiliary contactor designed for industrial control circuits. Featuring a size S00 design, it includes 2 normally open (NO) and 2 normally closed (NC) contacts with a 24V DC coil. This unit is equipped with an integrated suppressor diode, ensuring stable operation and protection in demanding automation environments. Ideal for switching control signals in electrical panels and industrial machinery.

## Long description

The Siemens 3RH2122-2KB40 is a high-performance auxiliary contactor engineered for precise control in industrial automation systems. Built in the compact S00 size, this device is designed to handle control signals reliably within electrical panels and complex machinery. It features a 24V DC coil and is equipped with an integrated suppressor diode, which effectively manages voltage spikes to protect sensitive electronic components and ensure consistent operational stability.
Advantages
This auxiliary contactor offers exceptional reliability due to its robust construction and integrated protective features. The inclusion of a built-in suppressor diode eliminates the need for external surge protection, saving space and simplifying installation. Its compact S00 design allows for efficient use of space in crowded control cabinets, while the 2NO+2NC contact configuration provides versatile switching options for various control logic requirements.
Suitable for
Industrial control circuits
Automation systems in manufacturing
Switching control signals for relays and contactors
Electrical panel integration
When it may not be suitable
This device is not intended for switching high-power loads or main motor circuits, as it is strictly designed for auxiliary control signals. It is also not suitable for applications requiring AC coil voltages, as this specific model is engineered exclusively for 24V DC operation.
Key specifications
Size: S00
Contacts: 2 Normally Open (NO) and 2 Normally Closed (NC)
Coil Voltage: 24V DC
Integrated protection: Suppressor diode
How to use
The contactor is designed for standard DIN rail mounting or screw mounting within an electrical enclosure. Connect the 24V DC control signal to the coil terminals, ensuring correct polarity. The auxiliary contacts should be wired according to the specific requirements of your control circuit, utilizing the NO and NC terminals to achieve the desired switching logic. Always verify that the control voltage matches the coil rating before energizing the unit.
What to consider before purchase
Verify that your control system provides a 24V DC supply.
Ensure the S00 size fits within your existing control cabinet layout.
Confirm that the 2NO+2NC contact configuration meets your circuit design needs.
Usage recommendations
Ensure that all electrical connections are tightened to the manufacturer's specified torque to prevent overheating and ensure long-term reliability. Regularly inspect the unit for signs of wear or debris in industrial environments.

## FAQ

### How much does the Siemens 3RH2122-2KB40 Auxiliary Contactor cost, and is it available for purchase?

The price is 36.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 27.07.2026 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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