# Siemens 3SK1121-1AB40 Safety Relay, 24V DC, 3NO/1NC Contacts

**URL:** https://aio.lv/en/product--siemens-3sk1121-1ab40--1779031
**Data updated:** 2026-05-22 07:20 (EEST)
**Category:** Control Systems
**Manufacturer:** Siemens
**Manufacturer code:** 3SK1121-1AB40
**EAN:** 4011209913585
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 275.99 €
**Prices and availability valid until:** 2026-07-29 23:59
**Price without VAT (21%):** 228.09 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3sk1121-1ab40--1779031

## 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 3SK1121-1AB40 is a high-reliability safety relay designed for industrial automation and machine safety systems. Operating at 24V DC, this device features 3 normally open (NO) and 1 normally closed (NC) contact configuration. It is engineered to monitor safety circuits and ensure reliable shutdown in emergency situations, providing essential protection for personnel and equipment in demanding industrial environments.

## Long description

The Siemens 3SK1121-1AB40 is a high-performance safety relay engineered to provide reliable monitoring and control within industrial automation and machine safety systems. Operating on a 24V DC power supply, this device is designed to maintain the integrity of safety circuits by ensuring an immediate and secure shutdown during emergency events. Its robust construction makes it an essential component for protecting both personnel and machinery in complex industrial environments.
Advantages
This safety relay offers exceptional reliability and durability, meeting stringent industrial standards for safety-critical applications. Its compact design allows for efficient space utilization within control cabinets, while the standardized contact configuration simplifies integration into existing safety architectures. The device is built to withstand demanding operational conditions, providing consistent performance and long-term stability for automated systems.
Suitable for
Emergency stop monitoring
Safety gate and interlock monitoring
Industrial automation safety circuits
Machine protection systems
This relay may not be suitable for applications requiring high-current switching beyond its rated contact capacity or for environments exceeding its specified temperature and environmental protection ratings. It is also not intended for use in non-safety-related control logic where standard relays would be more cost-effective.
Key specifications
Supply voltage: 24V DC
Contact configuration: 3 normally open (NO) and 1 normally closed (NC)
Application: Safety-related monitoring
Design: Compact industrial housing
To use the Siemens 3SK1121-1AB40, mount the device onto a standard DIN rail within a protected control cabinet. Ensure that all electrical connections are made according to the provided wiring diagrams, paying close attention to the safety circuit requirements. Once installed, perform a functional test to verify that the relay correctly monitors the safety inputs and triggers the appropriate shutdown sequence when an emergency condition is detected.
What to consider before purchase
Verify that the 24V DC supply voltage matches your control system requirements.
Ensure the contact configuration (3NO/1NC) meets the specific safety logic of your machine.
Check that the installation environment complies with the device's technical specifications.
Usage recommendations: Always ensure that the safety relay is installed by qualified personnel in accordance with local electrical regulations. Regularly inspect the device and perform periodic safety function tests to maintain the integrity of your machine safety system.

## FAQ

### How much does the Siemens 3SK1121-1AB40 Safety Relay cost, and is it available for purchase?

The price is 275.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 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 3SK1121-1AB40 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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