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Siemens 3TK2821-1CB30 | SIRIUS Safety Relay for Emergency Stop and Safety Monitoring Functions
Overview
The Siemens 3TK2821-1CB30 is a SIRIUS safety relay designed to ensure functional safety in machines and systems. It supports up to SIL 3 (IEC 62061) and PL e / Category 4 (ISO 13849-1) applications and is ideal for emergency stop buttons, safety door switches, and two-hand control systems. Operating at 24V DC, it provides 3 normally open (NO) and 1 normally closed (NC) safety-rated relay outputs.
Key Features
-
Control Voltage: 24V DC
-
Safety Outputs:
-
3 NO safety contacts
-
1 NC signaling contact
-
-
Safety Ratings:
-
SIL 3 (IEC 62061)
-
PL e / Cat. 4 (ISO 13849-1)
-
-
Function Types: E-stop, safety gate monitoring, two-hand operation
-
Reset Options: Automatic or manual reset
-
Mounting: DIN rail (EN 60715)
-
Status Indication: LED indicators for diagnostics
-
Housing Width: 45 mm
-
Connection: Screw-type terminals
-
Protection Class: IP20
Technical Specifications
-
Part Number: 3TK2821-1CB30
-
Series: SIRIUS Safety Integrated
-
Outputs: 3 NO (safety), 1 NC (monitoring)
-
Input Type: Dual-channel
-
Max Switching Voltage: 250V AC
-
Output Current: 6A @ 230V AC
-
Response Time: < 20 ms
-
Operating Temperature: -25°C to +60°C
-
Dimensions (HxWxD): Approx. 100 × 45 × 120 mm
-
Certifications: CE, UL, TUV, cULus, RoHS
Applications
-
Emergency stop circuits
-
Guard door safety monitoring
-
Light curtain integration
-
Two-hand control panels
-
Functional safety systems in industrial automation
Why Choose the 3TK2821-1CB30?
-
Meets Highest Safety Standards: SIL 3 / PL e / Cat. 4 compliant
-
Compact & Flexible: 45mm housing for narrow panels
-
Multiple Outputs: Supports complex machine safety architectures
-
LED Diagnostics: Clear status indication for fast troubleshooting
-
Reliable Siemens Engineering: Designed for critical safety functions
Order Now
The Siemens 3TK2821-1CB30 is available and ready for international delivery.
Description
Siemens 3TK2821-1CB30 | SIRIUS Safety Relay for Emergency Stop and Safety Monitoring Functions
Overview
The Siemens 3TK2821-1CB30 is a SIRIUS safety relay designed to ensure functional safety in machines and systems. It supports up to SIL 3 (IEC 62061) and PL e / Category 4 (ISO 13849-1) applications and is ideal for emergency stop buttons, safety door switches, and two-hand control systems. Operating at 24V DC, it provides 3 normally open (NO) and 1 normally closed (NC) safety-rated relay outputs.
Key Features
-
Control Voltage: 24V DC
-
Safety Outputs:
-
3 NO safety contacts
-
1 NC signaling contact
-
-
Safety Ratings:
-
SIL 3 (IEC 62061)
-
PL e / Cat. 4 (ISO 13849-1)
-
-
Function Types: E-stop, safety gate monitoring, two-hand operation
-
Reset Options: Automatic or manual reset
-
Mounting: DIN rail (EN 60715)
-
Status Indication: LED indicators for diagnostics
-
Housing Width: 45 mm
-
Connection: Screw-type terminals
-
Protection Class: IP20
Technical Specifications
-
Part Number: 3TK2821-1CB30
-
Series: SIRIUS Safety Integrated
-
Outputs: 3 NO (safety), 1 NC (monitoring)
-
Input Type: Dual-channel
-
Max Switching Voltage: 250V AC
-
Output Current: 6A @ 230V AC
-
Response Time: < 20 ms
-
Operating Temperature: -25°C to +60°C
-
Dimensions (HxWxD): Approx. 100 × 45 × 120 mm
-
Certifications: CE, UL, TUV, cULus, RoHS
Applications
-
Emergency stop circuits
-
Guard door safety monitoring
-
Light curtain integration
-
Two-hand control panels
-
Functional safety systems in industrial automation
Why Choose the 3TK2821-1CB30?
-
Meets Highest Safety Standards: SIL 3 / PL e / Cat. 4 compliant
-
Compact & Flexible: 45mm housing for narrow panels
-
Multiple Outputs: Supports complex machine safety architectures
-
LED Diagnostics: Clear status indication for fast troubleshooting
-
Reliable Siemens Engineering: Designed for critical safety functions
Order Now
The Siemens 3TK2821-1CB30 is available and ready for international delivery.