3SK1121-1CB42

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$305.01
$305.01
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The Siemens 3SK1121-1CB42 is a SIRIUS series safety relay designed as a basic unit with advanced features ideal for industrial automation safety applications. It features an adjustable time delay ranging from 0.5 to 30 seconds and operates at 24 V DC via secure screw terminals. This compact device provides 2 instantaneous normally open (NO) and 2 delayed NO safety contacts, making it suitable for critical safety monitoring tasks. With an IP20 protection rating, it is designed for finger-safe operation and reliable performance in harsh environments with temperatures from -25 to +60 °C. Certified to SIL 3 and PL e standards, the 3SK1121-1CB42 ensures high reliability for complex safety control systems requiring advanced time-delay safety circuits. The relay’s compact DIN-rail mount design optimizes panel space, while its rugged construction supports vibration and shock resistance, making it a dependable choice for machine and process safety controls.

Key Features of Siemens 3SK1121-1CB42

  • Adjustable time delay from 0.5 to 30 seconds for flexible safety timing
  • Two instantaneous and two delayed normally open contacts for versatile safety outputs
  • 24 V DC control voltage with screw terminal connection for secure wiring
  • Compact DIN-rail mount design suitable for control panel integration
  • IP20 finger-safe enclosure for operator safety during installation and maintenance
  • Certified to SIL 3 (IEC 61508) and PL e (ISO 13849) for highest safety integrity
  • Robust construction with resistance to vibration (5-500 Hz) and shock (10g/11 ms)
  • Reliable insulation voltage rating up to 300 V and surge voltage resistance of 4,000 V
  • Complies with EMI standards IEC 60947-5-1 for electromagnetic compatibility

Technical Specs of 3SK1121-1CB42

Explore Siemens 3SK1121-1CB42 specifications covering voltage, I/O, and communication to ensure system compatibility.

Parameter Value
Control Supply Voltage 24 V DC
Time Delay Range 0.5 to 30 seconds
Safety Contacts 2 instantaneous NO, 2 delayed NO
Mounting DIN-rail
Protection Class IP20
Operating Temperature -25 to +60 °C
Safety Certifications SIL 3, PL e
Insulation Voltage 300 V
Surge Voltage Resistance 4,000 V

Applications / Use Case

This Siemens 3SK1121-1CB42 is commonly used in industrial automation for ensuring safe control of emergency stops, light barriers, protective doors, and safety scanners. Its configurable time delay feature provides adaptable protection timing needed in production line systems, packaging operations, and factory control panels where precise safety interlock sequences are critical. The relay supports SIL 3 and PL e safety standards, making it suitable for applications requiring high reliability and compliance with international safety regulations. It integrates seamlessly into machine automation setups that demand robust and certified safety control components.

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3SK1121-1CB42

$305.01

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Does it come with a warranty?

Yes, All products are offered wth 1-Year warranty.

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