# Siemens 3SK1211-1BB40 Safety Relay, 24V DC, 4NO/1NC

**URL:** https://aio.lv/en/product--siemens-3sk1211-1bb40--1779065
**Data updated:** 2026-05-18 02:40 (EEST)
**Category:** Control Systems
**Manufacturer:** Siemens
**Manufacturer code:** 3SK1211-1BB40
**EAN:** 4011209913752
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 169.49 €
**Prices and availability valid until:** 2026-07-27 23:59
**Price without VAT (21%):** 140.07 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3sk1211-1bb40--1779065

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3SK1211-1BB40 is a high-reliability safety relay designed for industrial automation and machine safety systems. Operating at 24V DC, this unit features 4 normally open (NO) and 1 normally closed (NC) contacts. It is engineered to monitor safety circuits and ensure reliable shutdown in hazardous conditions, providing essential protection for personnel and equipment in various industrial applications.

## Long description

The Siemens 3SK1211-1BB40 safety relay is a robust component engineered for industrial automation and machine safety applications. Operating on a 24V DC power supply, this device is designed to monitor safety circuits and facilitate the reliable shutdown of machinery in hazardous situations. With its configuration of 4 normally open and 1 normally closed contacts, it provides a dependable interface between safety sensors and control systems, ensuring that equipment stops immediately when a safety breach is detected.
Advantages
This safety relay offers high reliability and durability, which are essential for maintaining continuous operation in demanding industrial environments. Its compact design allows for efficient use of space within control cabinets, while the standardized contact configuration simplifies integration into existing safety architectures. By providing precise monitoring of safety signals, it helps minimize downtime and enhances the overall safety profile of automated production lines.
Suitable for
Emergency stop monitoring
Safety gate and interlock monitoring
Light curtain integration
Industrial machinery shutdown systems
Automation control panels
When it may not be suitable
This relay is not intended for applications requiring AC control voltages, as it is specifically designed for 24V DC operation. Additionally, it may not be suitable for high-power switching applications that exceed the rated current capacity of its internal contacts.
Key specifications
Operating voltage: 24V DC
Contact configuration: 4 normally open (NO) and 1 normally closed (NC)
Application: Industrial safety and machine monitoring
Mounting type: Standard DIN rail
How to use
Installation should be performed by qualified personnel in accordance with local electrical regulations. The relay is mounted onto a standard DIN rail within a control cabinet. Connect the safety sensors to the input terminals and wire the output contacts into the machine control circuit to ensure the power supply to hazardous components is interrupted when the relay is triggered. Ensure all wiring is secure and that the device is protected from environmental contaminants.
What to consider before purchase
Verify that your control system operates on 24V DC.
Ensure the number of NO and NC contacts meets your safety circuit requirements.
Check the physical dimensions to ensure compatibility with your existing control cabinet layout.
Usage recommendations
Regularly test the safety function of the relay during scheduled maintenance intervals to ensure that the contacts operate correctly and that the safety circuit remains fully functional.

## FAQ

### How much does the Siemens 3SK1211-1BB40 Safety Relay 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 — 10 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 16.07.2026 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 3SK1211-1BB40 Safety Relay 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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