# Siemens SIRIUS 3SK1211-1BW20 Safety Relay Output Expansion Module, 24 V AC/DC

**URL:** https://aio.lv/en/product--siemens-3sk1211-1bw20--1779067
**Data updated:** 2026-05-18 02:40 (EEST)
**Category:** Control Systems
**Manufacturer:** Siemens
**Manufacturer code:** 3SK1211-1BW20
**EAN:** 4011209913769
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 169.49 €
**Prices and availability valid until:** 2026-08-02 23:59
**Price without VAT (21%):** 140.07 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3sk1211-1bw20--1779067

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.07.2026 | free |
| Pickup points | 27.07.2026 | 1.89 EUR |
| Courier delivery to door | 27.07.2026 | 4.99 EUR |

## Summary description

The Siemens SIRIUS 3SK1211-1BW20 is a high-reliability safety relay output expansion module designed to increase the number of available safety outputs in industrial control systems. Operating on 24 V AC/DC, this unit provides essential safety switching functions for machinery and automation processes. It features robust screw terminals for secure installation and is engineered for seamless integration within the SIRIUS safety product family to ensure reliable system monitoring.

## Long description

The Siemens SIRIUS 3SK1211-1BW20 is a high-reliability safety relay output expansion module engineered to extend the safety switching capabilities of industrial control systems. Designed for seamless integration within the SIRIUS safety ecosystem, this module allows for the expansion of safety outputs, ensuring that complex machinery and automation processes maintain strict safety standards. Operating on a 24 V AC/DC supply, the unit provides a robust and dependable solution for monitoring and controlling safety-critical circuits in demanding industrial environments.
Advantages
This expansion module offers significant benefits for system designers looking to scale their safety infrastructure without compromising on reliability. Its compact design allows for efficient use of space within control cabinets, while the high-quality construction ensures long-term durability and consistent performance. By utilizing this module, users can easily increase the number of safety outputs available, facilitating more complex safety logic and broader coverage for emergency stop or protective door monitoring systems. The integration process is straightforward, maintaining compatibility with existing SIRIUS safety components to minimize downtime during installation or system upgrades.
Suitable for
Industrial automation systems requiring additional safety outputs
Emergency stop monitoring circuits
Protective door and guard monitoring applications
Safety-critical machinery control
When it may not be suitable
This module is not intended for standalone safety functions and must be used in conjunction with a primary safety relay or safety controller. It is not suitable for applications requiring safety functions beyond the scope of standard relay output expansion or for environments exceeding the specified electrical and environmental ratings.
Key specifications
Supply voltage: 24 V AC/DC
Connection type: Screw terminals
Function: Safety relay output expansion
Compatibility: SIRIUS safety product family
How to use
The module is installed by mounting it onto a standard DIN rail within the control cabinet. Ensure the power supply is disconnected before wiring the unit. Connect the expansion interface to the primary safety relay according to the system wiring diagram, ensuring all screw terminals are tightened to the specified torque to prevent loose connections. Once wired, verify the system configuration and perform a functional test to ensure that the safety outputs respond correctly to the primary safety relay commands.
What to consider before purchase
Verify that the 24 V AC/DC supply voltage matches your control system requirements
Ensure compatibility with your existing primary safety relay model
Check that the number of available outputs meets your system design needs
Confirm that the screw terminal connection type is suitable for your wiring standards
Usage recommendations
Always perform a comprehensive safety validation test after installation to confirm that all safety circuits operate as intended and comply with local industrial safety regulations.

## FAQ

### How much does the Siemens SIRIUS 3SK1211-1BW20 Safety Relay Output Module cost, and is it available for purchase?

The price is 169.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 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 22.07.2026 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, Installment. All transactions are 100% secure and encrypted.

### Can Siemens SIRIUS 3SK1211-1BW20 Safety Relay Output Module be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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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