Siemens Sirius Safety relay, single channel, 3 safety contacts, 24VDC Part number 3SK1122-1AB40

Product Overview

The Siemens 3SK1122-1AB40 is a SIRIUS 3SK1 safety relay basic unit (Advanced series) designed for a single‐channel enabling circuit with three safety contacts and one signalling circuit. It operates at a control supply voltage of 24 V DC and is intended for safety monitoring and automation system protection tasks.

Key Features

• Safety relay basic unit, Advanced series (3SK1) with one enabling circuit
• Three safety contacts (relays) for safe switching of actuators or machine functions
• One electronic signalling circuit for system diagnostics or status indication
• Control supply voltage: 24 V DC (screw terminal connection)
• Designed to support safety-performance levels up to PL e / SIL 3 in compliant applications

Technical Specifications

• Product Series: SIRIUS 3SK1 Advanced basic units
• Article Number: 3SK1122-1AB40
• Supply Voltage (Us): 24 V DC
• Safety Contacts: 3 (relays) in output for enabling circuit
• Signalling Circuit: 1 electronic output for status or diagnostics
• Terminal Type: Screw-type terminals
• Degree of Pollution: 3
• Protection Class: IP20 (installed)

Compliance & Certifications

• Designed and manufactured by Siemens in accordance with relevant industrial safety relay standards
• Supports safety control system design up to PL e (ISO 13849-1) and SIL 3 (IEC 62061) in suitable configurations

Applications

Ideal for use in machine safety control systems, automation panels, production lines and safety-related shutdown circuits where an enabling function with diagnostic signalling is required. Commonly used for monitoring safety gates, emergency stop systems, two-hand control systems and other safety functions in manufacturing and infrastructure installations.