SIEMENS 3SK1121-1CB42 Sirius Safety Relay 24V

( Brand: Siemens ), ( Manufacturer Part Number: 3SK1121-1CB42 ), ( Part Type: Safety 24v )

Review SIEMENS New Sirius Safety Relay 24v Dc

The Siemens SIrius Siemens 3SK1121-1CB42 safety relay is a versatile and reliable component in safety applications that require 24V DC power. This safety relay, part of Siemens' Sirius range, is designed to provide secure and dependable operation in demanding industrial environments.

The 3SK1121-1CB42 is a compact, plastic-housed device that measures 128.5 x 77 x 29.5 mm. Its dimensions make it an excellent choice for applications where space is at a premium. Despite its small size, this safety relay offers impressive features and capabilities.

This safety relay features up to 16 safe inputs and up to 8 safe outputs. Each input can be configured as normally open (NO) or normally closed (NC), allowing for maximum flexibility in designing your application. The inputs can also be used in conjunction with the integrated contact monitoring function, ensuring that the contacts are closed or open when required.

The 3SK1121-1CB42 safety relay is designed to meet the stringent safety requirements of functional safety standard IEC 61508, SIL 3. This means that it can be used in applications where safety is paramount, such as in the process industry, machine building, or the oil and gas sector.

The safety relay's operation is based on Siemens' proven Safety Technology 3 technology, which ensures that all safety functions are executed reliably and independently of the control system. This technology includes features such as self-testing, diagnostic functions, and redundancy capabilities.

The 3SK1121-1CB42 safety relay can be easily integrated into control systems due to its wide range of communication interfaces. It supports both digital and analog interfaces, including PROFIBUS DP, PROFIBUS PA, and MODBUS.

The safety relay also features an integrated power supply unit, which ensures that the safety functions are always available, even if the control power fails. The integrated power supply unit can be configured to operate in either standalone mode or in parallel with the control power supply, providing an additional layer of safety.

The Siemens SIrius 3SK1121-1CB42 safety relay is designed to provide years of reliable operation in industrial environments. Its robust construction, combined with its advanced safety features and flexible configuration options, make it an excellent choice for applications where safety is a top priority.

Siemens Sirius Safety Relay 3SK1121-1CB42: A Comprehensive Analysis

The Siemens 3SK1121-1CB42 Sirius safety relay is a popular choice for automation applications due to its advanced safety features and reliability. In this analysis, we will discuss the pros and cons of buying this safety relay to help you make an informed decision.

1. High Safety Integrity: The Siemens 3SK1121-1CB42 safety relay conforms to the IEC 61508 standard and SIL 3 rating, ensuring a high level of safety integrity for critical applications.

2. Intuitive Programming: The device features a user-friendly PROFIsafe communication protocol, enabling easy and efficient programming, configuration, and diagnostics.

3. Compact Design: With a small footprint, the safety relay can be easily integrated into various control systems, saving space and installation costs.

4. Robust Construction: The device is built with high-quality components, ensuring long-term reliability and resistance to harsh operating conditions.

5. Wide Input and Output Range: The relay offers a wide range of inputs (16 to 128) and outputs (8 to 64), accommodating various automation requirements.

1. Higher Cost: Compared to standard relays, safety relays, including the Siemens 3SK1121-1CB42, are more expensive due to their advanced safety features and higher safety ratings.

2. Complex Installation: Due to the safety-critical nature of these relays, proper installation, grounding, and wiring are essential to ensure their effective operation.

3. Requires Expert Knowledge: Programming and configuring safety relays requires specialized knowledge and expertise, which may necessitate hiring a professional or investing in extensive training.

4. Limited Fault Tolerance: In the event of a failure, safety relays may require extensive repairs or replacement, leading to downtime and increased maintenance costs.

The Siemens 3SK1121-1CB42 Sirius safety relay offers several advantages, such as high safety integrity, intuitive programming, compact design, robust construction, and a wide input and output range. However, its higher cost, complex installation, requirement for expert knowledge, and limited fault tolerance are potential drawbacks.

If you are looking for a safety relay for critical applications that require a high level of safety integrity and advanced features, the Siemens 3SK1121-1CB42 Sirius safety relay is an excellent choice. However, it is essential to consider the additional costs and complexities associated with its installation and programming before making a purchase. Carefully evaluate your specific application requirements and budget to determine if this safety relay is the right fit for your project.

Details:

Items are not returnable for condition issues commented on or shown in the pictures. NEW Siemens 3SK1121-1CB42 SIRIUS Safety Relay 24V DC. Features an adjustable time delay from 0.5 to 30 seconds for flexible applications. Quick Delivery.

If you ever have any questions or are unsatisfied, for reason please let us know. New Siemens 3SK1121-1CB42 SIRIUS safety relay, Advanced series with time delay. VB Industrial Supply takes great pride to honestly and accurately describe each item listed. Fast Dispatch Service.

VB Industrial Supply offers a huge selection of tools for every trade including new and used electrical, mechanical, hydraulic pneumatic industrial components supplies. Quality Guarantee. Free Shipping. Includes 2 instantaneous normally open NO and delayed NO enabling circuits.

Our listings include many detailed photos.

part #: 3sk11211cb42 prices

• $105.88-$288.00

specifications aiactuato:

• brand: Siemens
• mpn: 3sk1121-1cb42
• part type: Safety 24v

offer aiactuato:

• options: Ship-to-home
• availability: In Stock
• started: August 22, 2025
• sold: 0
• best offers: True
• quantity: 1

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general aiactuato:

• condition: New Open box
• Electrical Equipment Supplies > Relays > Control Machine Tool Relays

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• rating: 99.7%
• city: Ventura, California
• # reviews: 20584

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