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Siemens 3SK1121-1CB42 safety relay, 24V DC, 3NO + 1NC, SIL 3, PL e, Cat 4, screw terminals, DIN rail mount.

Siemens 3SK1121-1CB42

SKU: 3SK1121-1CB42
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$550.00
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Siemens 3SK1121-1CB42 | SIRIUS 3SK1 Safety Relay – 3NO + 1NC, 24V DC, Basic Unit, SIL 3, PL e

Overview

The Siemens 3SK1121-1CB42 is a SIRIUS 3SK1 safety relay designed for use in safety circuits requiring up to SIL 3 / PL e / Category 4 protection. With 3 normally open (NO) and 1 normally closed (NC) contacts, this basic unit supports 24V DC operation and uses screw terminals for secure wiring. Ideal for emergency stop buttons, light curtains, and safety gates.

Key Features

  • Control Voltage: 24V DC

  • Contact Configuration: 3NO + 1NC

  • Safety Integrity: SIL 3 (IEC 61508), PL e (EN ISO 13849-1), Cat 4

  • Terminals: Screw-type

  • Mounting: DIN rail

  • Diagnostic LEDs: Power, status, and fault indicators

  • Restart Mode: Manual or automatic restart configurable

Technical Specifications

  • Part Number: 3SK1121-1CB42

  • Series: SIRIUS 3SK1 Basic Units

  • Response Time: < 30 ms

  • Operating Temperature: –25°C to +60°C

  • Protection Class: IP20 (housing), IP40 (front)

  • Dimensions (W x H x D): Approx. 22.5 x 100 x 121 mm

  • Weight: Approx. 160 g

  • Certifications: CE, UL, TUV, RoHS compliant

Applications

  • Emergency stop circuits

  • Safety door and interlock monitoring

  • Light curtain and laser scanner integration

  • Two-hand control systems

  • General machine safety logic

Why Choose the 3SK1121-1CB42?

  • High-Level Safety: Meets SIL 3 / PL e / Cat 4 standards

  • Compact Design: Slim 22.5mm width for control cabinets

  • Flexible Wiring: Screw terminals for secure connections

  • Diagnostic LEDs: Fast status feedback for maintenance

  • Proven Reliability: Siemens quality in safety-critical systems

Order Now

The Siemens 3SK1121-1CB42 safety relay is in stock and available for international shipping.

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 3SK1121-1CB42 | SIRIUS 3SK1 Safety Relay – 3NO + 1NC, 24V DC, Basic Unit, SIL 3, PL e

Overview

The Siemens 3SK1121-1CB42 is a SIRIUS 3SK1 safety relay designed for use in safety circuits requiring up to SIL 3 / PL e / Category 4 protection. With 3 normally open (NO) and 1 normally closed (NC) contacts, this basic unit supports 24V DC operation and uses screw terminals for secure wiring. Ideal for emergency stop buttons, light curtains, and safety gates.

Key Features

  • Control Voltage: 24V DC

  • Contact Configuration: 3NO + 1NC

  • Safety Integrity: SIL 3 (IEC 61508), PL e (EN ISO 13849-1), Cat 4

  • Terminals: Screw-type

  • Mounting: DIN rail

  • Diagnostic LEDs: Power, status, and fault indicators

  • Restart Mode: Manual or automatic restart configurable

Technical Specifications

  • Part Number: 3SK1121-1CB42

  • Series: SIRIUS 3SK1 Basic Units

  • Response Time: < 30 ms

  • Operating Temperature: –25°C to +60°C

  • Protection Class: IP20 (housing), IP40 (front)

  • Dimensions (W x H x D): Approx. 22.5 x 100 x 121 mm

  • Weight: Approx. 160 g

  • Certifications: CE, UL, TUV, RoHS compliant

Applications

  • Emergency stop circuits

  • Safety door and interlock monitoring

  • Light curtain and laser scanner integration

  • Two-hand control systems

  • General machine safety logic

Why Choose the 3SK1121-1CB42?

  • High-Level Safety: Meets SIL 3 / PL e / Cat 4 standards

  • Compact Design: Slim 22.5mm width for control cabinets

  • Flexible Wiring: Screw terminals for secure connections

  • Diagnostic LEDs: Fast status feedback for maintenance

  • Proven Reliability: Siemens quality in safety-critical systems

Order Now

The Siemens 3SK1121-1CB42 safety relay is in stock and available for international 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 3SK1121-1CB42

Siemens 3SK1121-1CB42

$550.00
Add to wishlist
Siemens 3SK1121-1CB42

Siemens 3SK1121-1CB42

Your Price:
$550.00
Item Added to Your Cart
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