3SK1121-1AB40
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The Siemens 3SK1121-1AB40 is a premium SIRIUS safety relay designed for autonomous safety applications in industrial automation. It features three safety-related normally open (NO) contacts for enabling circuits and one normally closed (NC) contact for signaling, offering highly reliable circuit monitoring and emergency stop circuit functions. Engineered with high Safety Integrity Level (SIL3) and Performance Level (PL e) standards compliance, this advanced basic unit provides robust protection in complex control environments. Its compact IP20-rated housing withstands operating temperatures from -25°C to +60°C, making it suitable for diverse industrial settings. The 3SK1121-1AB40 supports cascade and feedback inputs, enhancing safety circuit flexibility and diagnostics. This model ensures safe failure tolerance and is cross-circuit-proof, ideal for safety-critical machinery and process control applications.
Key Features of Siemens 3SK1121-1AB40
- Three safety-related NO relay outputs and one NC signaling output
- Designed for standard-compliant emergency stop and enabling circuits
- Safety integrity level SIL3 (IEC 61508) and performance level PL e (EN ISO 13849-1)
- Cross-circuit-proof and hardware fault tolerant with a safe failure fraction (SFF) of 99%
- Operating voltage of 24 V DC with screw terminal electrical connection
- Compact design for DIN rail mounting with IP20 protection
- Operating temperature range: -25°C to +60°C for versatile environments
- Support for cascading inputs and feedback loops to enhance safety monitoring
- Clear LED status and diagnostic indicators for ease of troubleshooting
Technical Specs of 3SK1121-1AB40
Explore Siemens 3SK1121-1AB40 specifications covering voltage, I/O, and communication to ensure system compatibility.
| Parameter | Specification |
|---|---|
| Product Brand | SIRIUS (Siemens) |
| Safety Category | 4 |
| Safety Outputs | 3 NO (relay contacts) |
| Signaling Outputs | 1 NC (relay contact) |
| Electrical Connection | Screw terminals |
| Operating Voltage | 24 V DC |
| Protection Rating | IP20 |
| Dimensions (WxHxD) | 22.5 x 100 x 121.6 mm |
| Operating Temperature | -25 to +60 °C |
| Safety Integrity Level | SIL3 (IEC 61508) |
| Performance Level | PL e (EN ISO 13849-1) |
Applications / Use Case
This Siemens 3SK1121-1AB40 is commonly used in industrial automation for reliable safety-related monitoring. Typical applications include emergency stop circuits, machine enabling functions, and control panel safety circuits in factory automation, packaging and conveyor operations, and process control systems. Its robust design and advanced diagnostics also enable integration in motion control setups where safety and quick response are critical. This relay is ideal for engineers looking to meet stringent safety standards without compromising system uptime.
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