Siemens Safety relay, basic unit, spring, 3NO + 1NC, 110 - 240VAC/DC

Product Overview

The 3SK1111-2AW20 is a SIRIUS safety relay basic unit from the standard series, designed to provide reliable safety monitoring and control functions in industrial applications. This compact safety relay features 3 NO contacts for enabling circuits plus 1 NC contact for signaling circuit, operating on a wide voltage range of 110-240 V AC/DC at 50/60 Hz. The device incorporates spring-type terminals with push-in technology for quick and secure connections without the need for tools. As a basic unit in the SIRIUS 3SK1 series, this safety relay provides essential safety functions for machinery protection, emergency stop circuits, and safety interlock systems where reliable switching and monitoring capabilities are critical for personnel and equipment protection.

Key Features & Specifications

• Safety Relay Type: Basic unit from SIRIUS standard series
• Contact Configuration: 3 NO (Normally Open) enabling circuits + 1 NC (Normally Closed) signaling circuit
• Supply Voltage: 110-240 V AC/DC, 50/60 Hz (wide voltage range)
• Terminal Type: Spring-type terminals with push-in technology
• Connection Method: Tool-free push-in terminal connections
• Series Classification: Standard series basic unit
• Compact Design: Space-efficient design for control panel installation
• Enabling Circuits: 3 NO contacts for multiple safety circuit enabling
• Signaling Circuit: 1 NC contact for status indication and monitoring

Technical Data

• Supply Voltage Range: 110-240 V AC/DC
• Frequency: 50/60 Hz
• Net Weight: 0.261 kg
• Packaging Dimensions: 36.00 x 109.00 x 152.00 mm
• Terminal Technology: Spring-type push-in terminals
• Housing: Compact industrial housing design
• Mounting: Standard DIN rail mounting capability
• Operating Temperature: Industrial temperature range
• Contact Material: High-grade contact materials for reliability

Contact Performance

• Enabling Circuit Contacts:
  • 3 Normally Open (NO) contacts
  • High switching capacity for safety applications
  • Reliable contact operation under load conditions
• Signaling Circuit Contact:
  • 1 Normally Closed (NC) contact
  • Status monitoring and feedback capability
  • Diagnostic and signaling functions
• Contact Life: Extended electrical and mechanical life
• Switching Reliability: Proven reliability in safety applications

Safety Features

• Safety Relay Function: Provides essential safety monitoring and control
• Multiple Enabling Circuits: 3 NO contacts for comprehensive safety enabling
• Status Monitoring: NC contact for signaling and diagnostic purposes
• Wide Voltage Range: Operates reliably across 110-240 V AC/DC range
• Fail-Safe Design: Ensures safe state in case of power failure
• Spring Terminal Technology: Secure, vibration-resistant connections
• Tool-Free Installation: Push-in terminals eliminate wiring errors
• Compact Form Factor: Maximizes control panel space utilization

Standards & Compliance

• Safety Standards: Designed for 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: Manufactured to Siemens industrial quality standards

Applications

The 3SK1111-2AW20 is ideal for a wide range of industrial safety applications including emergency stop systems, safety interlock circuits, machinery protection systems, and process safety monitoring. Common applications include manufacturing equipment safety controls, conveyor system protection, automated production line safety, packaging machinery interlocks, and industrial process monitoring. The wide voltage range makes it suitable for global applications with different power systems. The multiple enabling circuits allow for complex safety logic implementation, while the signaling contact provides essential status feedback for control systems and operator interfaces.

Important Notes

• Supply Voltage: Compatible with 110-240 V AC/DC power systems
• Terminal Type: Spring-type push-in terminals for tool-free installation
• Contact Configuration: 3 NO enabling + 1 NC signaling contacts
• Installation: Standard DIN rail mounting for control panel integration
• Wiring: Push-in terminals eliminate need for screwdrivers or special tools
• Safety Function: Designed for safety-critical applications requiring reliable operation
• Frequency Range: 50/60 Hz operation for global compatibility

Package Information

• EAN: 4011209913530
• 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, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol, and 4,4'-isopropylidenediphenol (Bisphenol A, BPA). 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