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Siemens 3SK1121-2CB41

SKU: 3SK1121-2CB41
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Siemens 3SK1121-2CB41 | SIRIUS Safety Relay – Basic Unit

Overview

The Siemens 3SK1121-2CB41 is a safety relay basic unit from the SIRIUS 3SK1 series, designed for safety-related applications up to SIL 3 / PL e / Category 4. It operates at 24V DC, includes 3 normally open (NO) and 1 normally closed (NC) contacts, and uses spring-loaded terminals for secure wiring. Ideal for simple and efficient safety integration in machines and automation systems.


Key Features

  • Input Voltage: 24V DC

  • Output Contacts: 3 NO + 1 NC

  • Terminal Type: Spring terminals

  • Operating Mode: Basic unit (standalone or expandable with modules)

  • Safety Standards:

    • SIL 3 (IEC 62061)

    • PL e / Cat. 4 (EN ISO 13849-1)

  • Status LEDs: For input/output and diagnostics

  • Housing Width: 22.5 mm

  • Mounting: DIN rail


Technical Specifications

  • Catalog Number: 3SK1121-2CB41

  • Contact Switching Capacity: Up to 6 A (resistive load)

  • Max Switching Voltage: 250V AC / 24V DC

  • Electrical Life: >100,000 operations

  • Mechanical Life: >10 million operations

  • Power Consumption: Approx. 1.5 W

  • Ambient Operating Temperature: -25°C to +60°C

  • Protection Class: IP20

  • Dimensions (W x H x D): 22.5 mm x 100 mm x 120 mm

  • Certifications: CE, UL, TUV, RoHS

  • Country of Origin: Germany


Applications

  • Emergency Stop Circuits

  • Guard Door Monitoring

  • Two-Hand Safety Controls

  • Light Curtain Integration

  • Machine Safety Compliance (EN ISO 13849)


Why Choose the 3SK1121-2CB41?

  • Reliable Functional Safety: Certified up to SIL 3 and PL e

  • Space-Saving Design: Slim 22.5 mm width

  • Spring Terminals: Quick, vibration-proof wiring

  • Diagnostic LEDs: Visual feedback for fast troubleshooting

  • Flexible Use: Works as a standalone unit or expandable


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New & Genuine Products – Factory Sealed At PLCpartssolution, all our products are 100% new, genuine, and come in original factory-sealed packaging. We guarantee authentic components that meet the highest industry standards for performance and reliability.
1-Year Warranty Included All new products sold by PLCpartssolution come with a 1-year warranty. We stand behind the quality and reliability of our parts, ensuring coverage against manufacturing defects under normal operating conditions.
Disclaimer: PLCpartssolution is an independent supplier of surplus and refurbished industrial automation products. We are not an authorized distributor, reseller, or representative of the brands listed on this website. All trademarks, brand names, and logos are the property of their respective owners. PLCpartssolution is not affiliated with, endorsed by, or approved by ABB, Fanuc, B&R, Rockwell Automation, Schneider Electric, Siemens, or any other manufacturers mentioned.

Description

Siemens 3SK1121-2CB41 | SIRIUS Safety Relay – Basic Unit

Overview

The Siemens 3SK1121-2CB41 is a safety relay basic unit from the SIRIUS 3SK1 series, designed for safety-related applications up to SIL 3 / PL e / Category 4. It operates at 24V DC, includes 3 normally open (NO) and 1 normally closed (NC) contacts, and uses spring-loaded terminals for secure wiring. Ideal for simple and efficient safety integration in machines and automation systems.


Key Features

  • Input Voltage: 24V DC

  • Output Contacts: 3 NO + 1 NC

  • Terminal Type: Spring terminals

  • Operating Mode: Basic unit (standalone or expandable with modules)

  • Safety Standards:

    • SIL 3 (IEC 62061)

    • PL e / Cat. 4 (EN ISO 13849-1)

  • Status LEDs: For input/output and diagnostics

  • Housing Width: 22.5 mm

  • Mounting: DIN rail


Technical Specifications

  • Catalog Number: 3SK1121-2CB41

  • Contact Switching Capacity: Up to 6 A (resistive load)

  • Max Switching Voltage: 250V AC / 24V DC

  • Electrical Life: >100,000 operations

  • Mechanical Life: >10 million operations

  • Power Consumption: Approx. 1.5 W

  • Ambient Operating Temperature: -25°C to +60°C

  • Protection Class: IP20

  • Dimensions (W x H x D): 22.5 mm x 100 mm x 120 mm

  • Certifications: CE, UL, TUV, RoHS

  • Country of Origin: Germany


Applications

  • Emergency Stop Circuits

  • Guard Door Monitoring

  • Two-Hand Safety Controls

  • Light Curtain Integration

  • Machine Safety Compliance (EN ISO 13849)


Why Choose the 3SK1121-2CB41?

  • Reliable Functional Safety: Certified up to SIL 3 and PL e

  • Space-Saving Design: Slim 22.5 mm width

  • Spring Terminals: Quick, vibration-proof wiring

  • Diagnostic LEDs: Visual feedback for fast troubleshooting

  • Flexible Use: Works as a standalone unit or expandable


Order Now

Available for fast global shipping.

Condition

New & Genuine Products – Factory Sealed At PLCpartssolution, all our products are 100% new, genuine, and come in original factory-sealed packaging. We guarantee authentic components that meet the highest industry standards for performance and reliability.

Warranty

1-Year Warranty Included All new products sold by PLCpartssolution come with a 1-year warranty. We stand behind the quality and reliability of our parts, ensuring coverage against manufacturing defects under normal operating conditions.

Disclaimer

Disclaimer: PLCpartssolution is an independent supplier of surplus and refurbished industrial automation products. We are not an authorized distributor, reseller, or representative of the brands listed on this website. All trademarks, brand names, and logos are the property of their respective owners. PLCpartssolution is not affiliated with, endorsed by, or approved by ABB, Fanuc, B&R, Rockwell Automation, Schneider Electric, Siemens, or any other manufacturers mentioned.
Siemens 3SK1121-2CB41

Siemens 3SK1121-2CB41

$2,100.00
Add to wishlist
Siemens 3SK1121-2CB41

Siemens 3SK1121-2CB41

Your Price:
$2,100.00
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