# Siemens 3RH2911-1HA31 Auxiliary Contact Block, 3NO + 1NC, Front Mount

**URL:** https://aio.lv/en/product--siemens-3rh29111ha31--1840826
**Data updated:** 2026-05-18 02:47 (EEST)
**Category:** Printer & Copier Parts
**Manufacturer:** Siemens
**Manufacturer code:** 3RH29111HA31
**EAN:** 4011209829350
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 17.49 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 14.45 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rh29111ha31--1840826

## 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 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3RH2911-1HA31 is a reliable auxiliary contact block designed for front mounting on SIRIUS contactors. It features a configuration of 3 normally open (NO) and 1 normally closed (NC) contacts. This modular component is essential for expanding the switching capabilities of industrial control systems, ensuring precise signal feedback and operational control in various automation applications.

## Long description

The Siemens 3RH2911-1HA31 auxiliary contact block is a high-quality modular component engineered for seamless integration with SIRIUS contactors. Designed for front mounting, this device provides a reliable solution for expanding the switching capacity of industrial control systems. With a configuration of 3 normally open (NO) and 1 normally closed (NC) contacts, it ensures precise signal feedback and robust operational control, making it an essential addition to complex automation setups where monitoring and interlocking are critical.
Advantages
This auxiliary contact block offers exceptional reliability and ease of installation due to its standardized design for SIRIUS contactors. The front-mount configuration allows for quick and efficient assembly without requiring additional space on the side of the contactor. Its durable construction ensures consistent performance in demanding industrial environments, providing stable electrical connections and accurate switching states that contribute to the overall safety and efficiency of control circuits.
Suitable for
Industrial automation and control systems
Motor control centers and starter assemblies
Signal feedback loops in manufacturing machinery
Interlocking circuits for safety and operational logic
This component may not be suitable for applications requiring high-power switching, as it is designed specifically for control and signal circuits. It is also not compatible with contactors outside of the specified SIRIUS series or those that do not support front-mounted auxiliary blocks.
Key specifications
Contact configuration: 3 normally open (NO) and 1 normally closed (NC)
Mounting type: Front mount
Compatibility: SIRIUS contactors
Function: Auxiliary switching and signal feedback
To install the contact block, ensure the power supply to the main contactor is disconnected. Align the block with the front mounting interface of the compatible SIRIUS contactor and press firmly until it clicks into place. Verify that the mechanical connection is secure and that the auxiliary contacts move freely when the main contactor is energized. Once installed, connect the control wiring to the designated terminals according to your circuit diagram.
What to consider before purchase
Verify compatibility with your specific SIRIUS contactor model
Check the required number of NO and NC contacts for your control logic
Ensure there is sufficient physical clearance for front-mounted accessories
For optimal performance and longevity, ensure that the terminal connections are tightened to the manufacturer's specified torque settings and that the device is protected from excessive dust, moisture, and extreme vibrations within the control cabinet.

## FAQ

### How much does the Siemens 3RH2911-1HA31 Auxiliary Contact Block cost, and is it available for purchase?

The price is 17.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 37 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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