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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3SK1121-1AB40 |
| Alternative Part Number | 3SK11211AB40 |
| Manufacturer | Siemens |
| Category | General Automation |
| Product Type | Safety Relay |
| Supply Voltage | 24 V DC |
| Terminal Type | Screw Terminal |
| Protection Class IP | IP20 |
| Insulation Voltage Rated Value | 300 V |
| Ambient Temperature (Operation) | -25 ... +60 °C |
| Ambient Temperature (Storage) | -40 ... +80 °C |
| Air Pressure | 90 kPa ... 106 kPa |
| Relative Humidity During Operation | 10 ... 95 % |
| Installation Altitude | Up to 2,000 m above sea level |
| Vibration Resistance | 5 ... 500 Hz: 0.75 mm |
| Shock Resistance | 10g / 11 ms |
| Surge Voltage Resistance | Rated value 4,000 V |
| EMC | Suitable for Class A environments only |
| Safety Integrity Level (SIL) | SIL3 according to IEC 61508 |
| Performance Level (PL) | PL e according to EN ISO 13849-1 |
| Category | Category 4 according to EN ISO 13849-1 |
| Safe Failure Fraction (SFF) | 99 % |
| PFHD | 0.0000000025 1/h |
| PFDavg | 0.000007 |
| T1 Value for Proof Test Interval | 20 years |
| Hardware Fault Tolerance | According to IEC 61508: 1 |
| Safety Device Type | Type B according to IEC 61508-2 |
| Number of Safety-Related Outputs | 3 NO contacts for safety-related instantaneous contact |
| Number of Signalling Outputs | 1 NC contact for signalling function |
| Weight | 0.280 kg |
| Commodity Code | 85364900 |
The Siemens Safety Relay, with the part number 3SK1121-1AB40, is a sophisticated and reliable component designed for seamless integration into various industrial safety systems. This advanced relay is part of the SIRIUS product range, renowned for its high-quality automation solutions.
Crafted to ensure the utmost safety, the 3SK1121-1AB40 operates with a 24 V DC control supply voltage and features a robust screw terminal connection for secure and stable wiring. The relay is equipped with three normally open (NO) contacts for enabling circuits, plus one normally closed (NC) contact for signalling purposes, providing flexibility and adaptability to a wide array of safety applications.
With an insulation voltage rated at 300 V and a protection class of IP20, this safety relay is designed to be finger-safe, preventing accidental electrical shocks. It is capable of withstanding a wide range of ambient temperatures from -25 to +60 °C during operation, ensuring reliability in diverse working environments.
The 3SK1121-1AB40 is specifically engineered for Class A environments, adhering to stringent EMC requirements to minimise radio-frequency interference in residential areas. It boasts an impressive mechanical service life with typical switching cycles up to 10 million, highlighting its durability and longevity.
This safety relay is also parameterisable, offering features such as sensor floating/non-floating, monitored start/autostart, and cross-circuit detection. It supports both single-channel and two-channel sensor connections, enhancing its versatility in monitoring safety switches, floating sensors, non-floating sensors, and magnetically operated switch monitoring.
The 3SK1121-1AB40 is a testament to Siemens' commitment to functional safety, with certifications that include Safety Integrity Level (SIL) 3 according to IEC 61508, Performance Level (PL) e according to EN ISO 13849-1, and Category 4 according to EN ISO 13849-1. These credentials ensure that the relay meets the highest standards of safety and reliability for machinery and safety-related circuits.
In summary, the Siemens 3SK1121-1AB40 Safety Relay is an essential component for any industrial safety system, offering advanced features, robust construction, and compliance with international safety standards. It is an ideal choice for those seeking a dependable solution to manage and enhance the safety of their automated processes.
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Frequently Asked Questions
What is the purpose of this safety relay?
The Siemens Safety Relay is designed for monitoring and controlling safety functions within an automation environment. It ensures that machines and processes operate safely by initiating the necessary responses when a safety event occurs.
Can this safety relay be used for emergency stop applications?
Yes, it is suitable for use in emergency stop applications, as well as safety gate monitoring and light curtain integration, among other safety functions.
What type of power supply is required for this safety relay?
This safety relay requires a 24 V DC power supply for operation.
What are the environmental operating conditions for this safety relay?
The relay operates within an ambient temperature range of -25 to +60 degrees Celsius and can be stored in temperatures ranging from -40 to +80 degrees Celsius. It is also designed to withstand certain levels of vibration and shock.
What is the significance of the SIL rating for this relay?
The Safety Integrity Level (SIL) rating indicates the reliability of the safety functions performed by the relay. This relay has a SIL3 rating, which means it is suitable for high-risk applications where a high level of safety integrity is required.
How does this safety relay contribute to a machine's Performance Level?
The relay is rated to Performance Level e (PL e) according to EN ISO 13849-1, which is the highest level of performance for controlling safety-related parts of a control system.
What type of terminals does this safety relay have?
It comes equipped with screw terminals, which provide a secure and reliable connection for wiring.
Is this safety relay suitable for use in residential areas?
This product is intended for Class A environments, which are typically industrial settings. It may cause radio-frequency interference in residential environments, so appropriate measures should be taken if used in such areas.
What is the maximum installation altitude for this safety relay?
The maximum installation altitude for this relay is 2000 meters above sea level.
Can this safety relay be used in a safety system with both single-channel and dual-channel wiring?
Yes, it supports both single-channel and two-channel safety-related wiring, allowing for flexibility in safety system design.
