ABB BT50 Safety Relay/Expansion Relay

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1. Product Overview

The ABB BT50 is a safety relay / expansion relay used in industrial automation and machine safety control systems. It provides reliable emergency stop (E-Stop), two-hand control, light curtain, and safety door monitoring functions. The BT50 can be used with a main safety controller to extend safety circuit outputs, supporting multi-point safety control. It features fast response, compact design, easy installation, and configuration, widely applied in industrial production and automation.

2. Technical Specifications

• Model: BT50

• Product Type: Safety Relay / Expansion Relay

• Supply Voltage: 24 V DC

• Input Type: Safety switch inputs (E-Stop, two-hand control, light curtain, etc.)

• Output Type: Safety relay contacts (SIL 3 / PL e)

• Number of Poles: 2~4 safety output contacts (depending on model)

• Response Time: ≤ 20 ms

• Mechanical Life: ≥ 10,000,000 operations

• Electrical Life: ≥ 100,000 operations

• Mounting: DIN rail

• Protection Class: IP20

• Operating Temperature: -25 ℃ to +55 ℃

• Standards Compliance: IEC 61508, IEC 62061, ISO 13849-1

• Features: Fast response, safety reliability, modular expansion, easy commissioning

3. Key Advantages & Features

• High Safety Level – Complies with SIL 3 / PL e standards for high-reliability safety circuits.

• Fast Response – Short response time suitable for emergency stop and high-frequency safety applications.

• Modular Design – Can be used with a main safety controller to extend safety outputs.

• Compact Structure – Space-saving design for DIN rail installation, easy panel wiring.

• Easy Commissioning & Maintenance – Clear LED status indicators for quick circuit monitoring.

• Multi-Functional Compatibility – Can connect to safety switches, two-hand controllers, light curtains, and safety doors.

4. Typical Applications

• Emergency stop and safety protection for industrial production lines

• Safety control for automated machinery

• Robotics and assembly line safety monitoring

• Machine tools, packaging machines, and automation equipment safety

• Multi-point safety circuit expansion in industrial automation

• Safety circuits for light curtains, safety doors, and two-hand operation

5. Installation & Usage Notes

• Input and Output Matching – Ensure input device type matches relay input, output contacts do not exceed rated load.

• Proper Installation – Install securely on DIN rail to prevent loosening due to vibration.

• Power Supply Matching – Use compliant 24 V DC supply to avoid over-voltage or under-voltage affecting operation.

• Periodic Inspection – Check relay outputs and LED indicators regularly to ensure proper safety circuit operation.

• Environmental Requirements – Avoid prolonged use in high humidity, high temperature, or corrosive environments; use protective measures if necessary.