Siemens Sirius Safety relay, output expansion, 4NO + 1NC, 24VAC Part number 3SK1211-1BB00

Product Overview

The 3SK1211-1BB00 is a SIRIUS safety relay output expansion unit (4RO) designed to extend the output capabilities of safety relay systems. This output expansion module provides 4 NO contacts for relay enabling circuits plus 1 NC contact for relay signaling circuit, operating at 24 V AC with reliable screw terminal connections. The unit is specifically designed to work in conjunction with SIRIUS safety relay basic units, providing additional output contacts when more switching capacity is required for complex safety applications. This expansion capability allows for comprehensive safety system design where multiple actuators, contactors, or signaling devices need to be controlled from a single safety relay system.

Key Features & Specifications

• Product Type: Output expansion unit (4RO) for SIRIUS safety relay systems
• Contact Configuration: 4 NO (Normally Open) enabling circuits + 1 NC (Normally Closed) signaling circuit
• Supply Voltage: 24 V AC
• Terminal Type: Screw terminals for secure field connections
• Expansion Function: Extends output capabilities of safety relay basic units
• Enabling Circuits: 4 NO contacts for multiple actuator control
• Signaling Circuit: 1 NC contact for status indication and monitoring
• System Integration: Designed to work with SIRIUS safety relay basic units
• Compact Design: Space-efficient expansion solution for control panels
• Industrial Grade: Robust construction for harsh industrial environments

Technical Data

• Supply Voltage: 24 V AC
• Net Weight: 0.231 kg
• Packaging Dimensions: 36.00 x 109.00 x 152.00 mm
• Terminal Technology: Screw terminals for reliable field connections
• Housing: Industrial-grade housing design
• Mounting: Standard DIN rail mounting capability
• Operating Temperature: Industrial temperature range
• Expansion Type: 4RO (4 relay outputs) configuration
• Connection Method: Screw terminal connections for field wiring

Contact Performance

• Enabling Circuit Contacts:
  • 4 Normally Open (NO) contacts
  • High switching capacity for multiple actuator control
  • Reliable contact operation for safety applications
• Signaling Circuit Contact:
  • 1 Normally Closed (NC) contact
  • Status monitoring and feedback capability
  • Diagnostic and signaling functions
• Contact Life: Extended electrical and mechanical life
• Switching Reliability: Proven performance in safety applications
• Load Handling: Optimized for diverse safety actuator requirements

Safety Features

• Output Expansion: Provides additional output contacts for complex safety systems
• Multiple Enabling Circuits: 4 NO contacts for comprehensive actuator control
• Status Monitoring: NC contact for signaling and diagnostic purposes
• 24 V AC Operation: Reliable AC operation for industrial environments
• Expansion Capability: Allows scaling of safety systems without additional basic units
• Screw Terminal Connections: Secure, vibration-resistant field connections
• System Integration: Seamless integration with SIRIUS safety relay basic units
• Fail-Safe Design: Ensures safe state in case of power failure or fault conditions
• Compact Form Factor: Efficient use of control panel space

Standards & Compliance

• Safety Standards: Designed for industrial safety applications
• Product Lifecycle: PM300 Active Product status
• Export Control: AL: N / ECCN: N classification
• Environmental: RoHS directive compliance since 05.11.2012
• Waste Management: WEEE (2012/19/EU) Take-Back Obligation compliant
• Country of Origin: Germany
• Product Classification: Class A standard product with return eligibility
• Quality Standards: Manufactured to Siemens industrial quality standards

Applications

The 3SK1211-1BB00 is ideal for expanding the output capabilities of safety relay systems where multiple actuators, contactors, or signaling devices need to be controlled. Common applications include large manufacturing systems with multiple safety contactors, conveyor systems with distributed actuators, packaging machinery with numerous safety devices, automated production lines requiring extensive output control, and process systems with multiple safety-related outputs. The 4 NO enabling circuits make it perfect for controlling multiple motor contactors, solenoid valves, brake releases, or other safety actuators, while the NC signaling circuit provides essential status feedback to control systems and operator interfaces.

Important Notes

• Expansion Unit: Designed to work with SIRIUS safety relay basic units
• Supply Voltage: 24 V AC operation for industrial compatibility
• Contact Configuration: 4 NO enabling + 1 NC signaling contacts
• Terminal Type: Screw terminals for secure field wiring connections
• Installation: Standard DIN rail mounting for control panel integration
• System Design: Requires safety relay basic unit for complete system operation
• Output Expansion: Provides additional switching capacity for complex safety systems
• Multiple Outputs: Four enabling circuits for comprehensive actuator control

Package Information

• EAN: 4011209913745
• UPC: Not available
• Packaging Dimensions: 36.00 x 109.00 x 152.00 mm
• Packaging Quantity: 1 piece
• Net Weight: 0.231 kg

REACH Compliance Information

This product contains substances from the REACH candidate list in concentrations higher than 0.1% weight by weight: Lead and Lead monoxide (lead oxide). Based on current available information, these substances do not pose any risk when the product is used as intended, including disposal.

Download existing graphical data for this product:

• Product Details - Siemens Industry Mall
• Technical Data Sheet (PDF)
• Product Support - Siemens Industry Online Support