Siemens Sirius Safety relay, basic unit, spring, 3NO + 1NC, 24VDC Part number 3SK1121-2AB40

Product Overview

The 3SK1121-2AB40 is a SIRIUS safety relay basic unit from the advanced series, designed for sophisticated 24 V DC safety applications requiring enhanced functionality and performance. This advanced safety relay provides 3 NO contacts for relay enabling circuits plus 1 NC contact for relay signaling circuit, offering superior safety monitoring and control capabilities. The device incorporates spring-type terminals with push-in technology for rapid, tool-free installation and secure connections. As part of the advanced series, this safety relay delivers enhanced features beyond standard models, making it ideal for complex safety systems, multi-zone monitoring, and applications requiring advanced safety logic and diagnostic capabilities.

Key Features & Specifications

• Safety Relay Type: Basic unit from SIRIUS advanced series (enhanced functionality)
• Contact Configuration: 3 NO (Normally Open) enabling circuits + 1 NC (Normally Closed) signaling circuit
• Supply Voltage: 24 V DC (dedicated low-voltage safety operation)
• Terminal Type: Spring-type terminals with push-in technology
• Connection Method: Tool-free push-in terminal connections
• Series Classification: Advanced series with enhanced capabilities
• Enabling Circuits: 3 NO contacts for multiple safety circuit enabling
• Signaling Circuit: 1 NC contact for status indication and diagnostics
• Advanced Features: Enhanced functionality beyond standard series models
• Compact Design: Efficient space utilization in control panels

Technical Data

• Supply Voltage: 24 V DC
• Net Weight: 0.261 kg
• Packaging Dimensions: 36.00 x 109.00 x 152.00 mm
• Terminal Technology: Spring-type push-in terminals
• Housing: Advanced series industrial housing design
• Mounting: Standard DIN rail mounting capability
• Operating Temperature: Industrial temperature range
• Series: Advanced series for enhanced performance
• Contact Material: High-grade materials for extended reliability

Contact Performance

• Enabling Circuit Contacts:
  • 3 Normally Open (NO) contacts
  • Enhanced switching capacity for advanced safety applications
  • Superior contact reliability under varying load conditions
• Signaling Circuit Contact:
  • 1 Normally Closed (NC) contact
  • Advanced status monitoring and feedback capability
  • Enhanced diagnostic and signaling functions
• Contact Life: Extended electrical and mechanical life cycle
• Switching Performance: Advanced series reliability and precision
• Load Handling: Optimized for diverse safety application requirements

Safety Features

• Advanced Series Technology: Enhanced safety functionality beyond standard models
• Multiple Enabling Circuits: 3 NO contacts for comprehensive safety enabling
• Enhanced Status Monitoring: Advanced NC contact for signaling and diagnostics
• 24 V DC Operation: Safe low-voltage operation for personnel protection
• Fail-Safe Design: Advanced fail-safe mechanisms for critical safety applications
• Spring Terminal Technology: Vibration-resistant, secure connections
• Tool-Free Installation: Push-in terminals prevent wiring errors and reduce installation time
• Advanced Diagnostic Capabilities: Enhanced monitoring and feedback features
• Compact Form Factor: Maximizes control panel space efficiency

Standards & Compliance

• Safety Standards: Designed for advanced industrial safety applications
• Product Lifecycle: PM300 Active Product status
• Export Control: AL: N / ECCN: N classification
• Environmental: RoHS directive compliance since 05.11.2012
• Waste Management: WEEE (2012/19/EU) Take-Back Obligation compliant
• Country of Origin: Germany
• Product Classification: Class A standard product with return eligibility
• Quality Standards: Advanced series quality and performance standards
• Advanced Series: Enhanced capabilities beyond standard series models

Applications

The 3SK1121-2AB40 is ideal for advanced 24 V DC safety applications requiring enhanced functionality and multiple enabling circuits. Common applications include sophisticated manufacturing equipment safety systems, multi-zone safety monitoring, complex automated production line protection, advanced packaging machinery interlocks, and process safety systems requiring enhanced diagnostic capabilities. The advanced series features make it particularly suitable for applications demanding superior performance, advanced safety logic, and comprehensive monitoring capabilities. The 3 NO enabling circuits allow for complex safety configurations while the enhanced signaling circuit provides advanced status feedback for control systems and operator interfaces.

Important Notes

• Advanced Series: Enhanced functionality beyond standard series models
• Supply Voltage: Specifically designed for 24 V DC operation
• Contact Configuration: 3 NO enabling + 1 NC signaling contacts
• Terminal Type: Spring-type push-in terminals for tool-free installation
• Installation: Standard DIN rail mounting for control panel integration
• Enhanced Features: Advanced series provides superior capabilities and diagnostics
• Multiple Enabling: Three enabling circuits for complex safety logic implementation
• Low Voltage: 24 V DC operation for enhanced personnel safety

Package Information

• EAN: 4011209913622
• UPC: Not available
• Packaging Dimensions: 36.00 x 109.00 x 152.00 mm
• Packaging Quantity: 1 piece
• Net Weight: 0.261 kg

REACH Compliance Information

This product contains substances from the REACH candidate list in concentrations higher than 0.1% weight by weight: Lead, Lead monoxide, 2,2',6,6'-tetrabromo-4,4'-isopropylidenediphenol, 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol, 4,4'-isopropylidenediphenol (Bisphenol A, BPA), and Lead titanium zirconium oxide. Based on current available information, these substances do not pose any risk when the product is used as intended, including disposal.

Download existing graphical data for this product:

• Product Details - Siemens Industry Mall
• Technical Data Sheet (PDF)
• Product Support - Siemens Industry Online Support