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B&R X20TB52

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B&R X20TB52
May 27, 2026

B&R X20TB52

The B&R X20TB52 is a 12-pin safety-keyed push-in terminal block in the X20 SafeIO series, colored yellow for safety circuit identification. It is designed for tool-free, reliable field wiring of X20 safety I/O modules in high-integrity industrial safety systems. Featuring lever-operated push-in spring technology, it enables fast, secure copper wire connections with low contact resistance. The safety-keyed design ensures mechanical compatibility only with matching X20 safety modules, preventing incorrect mounting and supporting SIL 3 / PL e safety levels. Built for shock and vibration resistance, it offers integrated test ports and individual terminal labeling for easy commissioning and maintenance.

Description

B&R X20TB52

Product Introduction

The B&R X20TB52 is a 12-pin safety-keyed push-in terminal block in the X20 SafeIO series, colored yellow for safety circuit identification. It is designed for tool-free, reliable field wiring of X20 safety I/O modules in high-integrity industrial safety systems. Featuring lever-operated push-in spring technology, it enables fast, secure copper wire connections with low contact resistance. The safety-keyed design ensures mechanical compatibility only with matching X20 safety modules, preventing incorrect mounting and supporting SIL 3 / PL e safety levels. Built for shock and vibration resistance, it offers integrated test ports and individual terminal labeling for easy commissioning and maintenance.

Basic Information

  • Model: X20TB52

  • Brand: B&R (Bernecker + Rainer, ABB Group)

  • Series: X20 System, X20 SafeIO

  • Type: 12-pin safety-keyed push-in terminal block

  • Color: Yellow (safety circuit designation)

  • Rated Voltage: 240 VAC nominal; max. 300 VAC

  • Rated Current: 10 A per contact

  • Connection Technology: Push-in with lever release (tool-free)B& R Industrial Automation

  • Wire Range: 0.08–2.5 mm² (28–14 AWG) solid; 0.25–2.5 mm² (24–14 AWG) fine-stranded; 0.25–1.5 mm² (24–16 AWG) with wire end sleeve

  • Stripping Length: 7–9 mm

  • Contact Resistance: ≤5 mΩ

  • Dimensions: 12 mm × 100 mm × 75 mm

  • Weight: Approx. 0.12 kg

  • Mounting: Snaps onto X20 safety I/O modules (DIN rail mounted)

  • Protection Class: IP20

  • Certifications: CE, UL, CSA, RoHS; compatible with SIL 3 / PL e systemsB& R Industrial Automation

Function and Positioning

The X20TB52 acts as a safety-grade field wiring interface for X20 SafeIO modules, connecting safety-related sensors and actuators to the X20 controller system. Its yellow color and safety-keyed design clearly identify safety circuits and prevent mismating with standard I/O modules, which is critical for maintaining safety integrity. Push-in technology reduces wiring time and errors compared to screw terminals, while lever release allows quick disconnection for troubleshooting. Integrated 2 mm test ports enable easy diagnostics without disconnecting wires, and individual terminal labeling supports clear circuit documentation. Positioned as a high-reliability connection solution for safety systems, it ensures consistent signal integrity in harsh industrial environments and supports hot-swapping of modules.

Core Performance Parameters

  • Safety Compatibility: SIL 3 (IEC 61508), PL e / Cat. 4 (EN ISO 13849-1) with matched safety modulesB& R Industrial Automation

  • Contact Resistance: ≤5 mΩ

  • Insulation Voltage: 500 V (channel-to-bus)

  • Push-in Force: Typ. 10 N per contact

  • Operating Temperature: −25°C to +60°C (horizontal mounting)

  • Storage Temperature: −40°C to +85°C

  • Humidity: 5–95% non-condensing

  • Vibration Resistance: 5 g (10–500 Hz)

  • Durability: ≥500 insertion/removal cycles

  • Contact Spacing: 4.2 mm (horizontal), 10.96 mm (vertical)B& R Industrial Automation

General Compatible Accessories

  • X20 SafeIO modules (e.g., X20SO4110, X20DI4371)B& R Industrial Automation

  • X20BM33 safety-keyed bus module

  • 35 mm standard DIN rail mounting hardware

  • Terminal labeling strips and markers

  • 2 mm standard test probes

  • Redundant 24 VDC power supply units

  • X2X Link communication cables

  • B&R Automation Studio and SafeDESIGNER software

Applicable Equipment Fields

  • Machine Safety: Emergency stop circuits, safety door interlocks, light curtain interfaces

  • Process Automation: Chemical, pharmaceutical, food and beverage safety I/O wiring

  • Automotive: Assembly line safety controls, robot cell safeguarding, press safety systems

  • Packaging Machinery: High-speed line safety actuator and sensor connections

  • Material Handling: Crane, hoist, and conveyor safety circuits

  • Energy: Power plant auxiliary safety, wind turbine control systems

  • General Industrial: High-vibration environments, safety panel building, system retrofitting


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