# Siemens 3RH2140-1BB40 Auxiliary Contactor, 4 NO Contacts, 24V DC Coil, Size S00

**URL:** https://aio.lv/en/product--siemens-3rh2140-1bb40--1796514
**Data updated:** 2026-06-12 15:54 (EEST)
**Category:** Printer & Copier Parts
**Manufacturer:** Siemens
**Manufacturer code:** 3RH2140-1BB40
**EAN:** 4011209828612
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 34.49 €
**Prices and availability valid until:** 2026-08-06 23:59
**Price without VAT (21%):** 28.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rh2140-1bb40--1796514

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 24.07.2026 | free |
| Pickup points | 29.07.2026 | 1.89 EUR |
| Courier delivery to door | 29.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3RH2140-1BB40 is a high-reliability auxiliary contactor designed for industrial control circuits. Featuring 4 normally open (NO) contacts and a 24V DC control coil, this size S00 device is ideal for switching auxiliary signals in automation systems. It ensures robust performance and seamless integration into standard control panels, providing efficient operation for various electrical switching applications.

## Long description

The Siemens 3RH2140-1BB40 is a high-performance auxiliary contactor engineered for demanding industrial control circuits. This compact size S00 device is designed to handle auxiliary signals with precision and reliability, making it an essential component for modern automation systems. It features four normally open contacts and is powered by a 24V DC coil, ensuring consistent operation in various electrical control environments.
Advantages
This auxiliary contactor offers exceptional durability and long-term operational stability in industrial settings. Its compact S00 design allows for space-efficient installation within control panels, helping to optimize cabinet layout. The device is built to withstand rigorous switching cycles, providing a dependable solution for complex control logic and signal processing tasks. Its standardized interface ensures compatibility with a wide range of Siemens industrial components, facilitating seamless integration into existing infrastructure.
Suitable for
Industrial automation control systems
Signal switching in control panels
Interlocking and monitoring circuits
Electrical relay logic applications
When it may not be suitable
This device is designed specifically for auxiliary control circuits and is not intended for switching high-power main loads or heavy-duty motors. It should not be used in applications requiring normally closed contacts, as this model is configured exclusively with four normally open contacts.
Key specifications
Size: S00
Contact configuration: 4 normally open (NO)
Control coil voltage: 24V DC
Mounting type: Standard DIN rail or screw mounting
How to use
The contactor should be mounted on a standard 35mm DIN rail or secured via screw mounting within a control cabinet. Ensure that the control circuit wiring is connected to the coil terminals according to the specified 24V DC voltage requirements. The auxiliary contacts should be wired into the control logic circuit to perform the desired switching functions. Always verify that the electrical connections are tightened to the manufacturer's specified torque settings to ensure a secure and conductive contact.
What to consider before purchase
Verify that the 24V DC control voltage matches your system requirements.
Ensure that the 4 NO contact configuration meets your specific logic circuit needs.
Check the available space in your control panel for the S00 size footprint.
Usage recommendations
Regularly inspect the terminal connections for tightness and ensure the environment remains within the specified temperature and humidity ranges to maintain optimal performance and longevity of the contactor.

## FAQ

### How much does the Siemens 3RH2140-1BB40 Auxiliary Contactor cost, and is it available for purchase?

The price is 34.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 35 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 24.07.2026 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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