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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
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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
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Mounting: DIN rail
Technical Specifications
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Catalog Number: 3SK1121-2CB41
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Contact Switching Capacity: Up to 6 A (resistive load)
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Max Switching Voltage: 250V AC / 24V DC
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Electrical Life: >100,000 operations
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Mechanical Life: >10 million operations
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Power Consumption: Approx. 1.5 W
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Ambient Operating Temperature: -25°C to +60°C
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Protection Class: IP20
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Dimensions (W x H x D): 22.5 mm x 100 mm x 120 mm
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Certifications: CE, UL, TUV, RoHS
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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.
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.