ABB TB820

Description

Product Description

The ABB TB820 is a rugged and modular terminal block system designed for reliable and organized electrical connections in industrial control panels, switchgear, and automation cabinets. As part of ABB’s extensive electrical components range, the TB820 series provides a versatile and high-quality solution for terminating and distributing power, control, and signal wires. The ABB TB820 system is characterized by its robust construction, clear marking options, and flexibility in configuration, allowing for the creation of custom terminal arrangements to suit specific wiring diagrams. For detailed technical data, dimension drawings, and accessory lists, the essential resource is the official ABB Electrification Products catalog for the ABB TB820. Utilizing the TB820 terminal block system ensures a professional, safe, and maintainable wiring infrastructure, which is the foundational backbone of any well-designed control system. Its design prioritizes ease of installation, long-term reliability, and compliance with international electrical standards.

Product Parameters

• Manufacturer / Brand: ABB.
• Series: TB8 Series DIN-Rail Terminal Blocks.
• Model: TB820 (specific variant within the TB8 series, indicating features like number of levels, disconnect function, etc.).
• Type: Modular DIN-rail mounted terminal block. The “TB820” designation may specify a particular type, such as a feed-through, disconnect, or fuse terminal block.
• Rated Voltage: Typically rated for up to 600V.
• Rated Current: Designed for specific current ratings, common values being 20A, 32A, or higher, depending on the exact variant.
• Wire Range: Accommodates a defined range of conductor cross-sections (e.g., 0.2 mm² to 10 mm² or 12 AWG to 8 AWG).
• Connection Technology: Uses screw clamp connections for secure and reliable wire termination.
• Material: Housing made of flame-retardant polyamide (PA 6.6); clamp and current bar made of copper alloy.
• Mounting: Snap-on mounting on standard 35mm DIN rail (EN 60715).
• Marking: Features integrated marking areas for wire numbering and identification.
• Accessories: Compatible with a wide range of accessories including end covers, marking systems, test plugs, and bridge connectors.

Advantages and Features

• High Reliability and Safety: Robust screw clamps ensure vibration-resistant and gas-tight connections, minimizing the risk of hot spots and loose wires. Complies with relevant IEC/UL standards.
• Modular Flexibility: The system allows for the creation of custom terminal rows by snapping together different block types (feed-through, fuse, disconnect, grounding) to match the exact circuit requirements.
• Easy Installation and Maintenance: Clear marking, easy access to screws, and the ability to add or remove blocks without dismantling the entire row significantly reduce wiring time and simplify future modifications.
• Excellent Organization: Creates a clean, professional, and logical layout in the control panel, which is crucial for troubleshooting and safety during maintenance.
• Proven Quality: As an ABB product, it offers the assurance of consistent manufacturing quality, material integrity, and global availability.

Application Cases in Industry

• PLC and DCS Control Panels: The ABB TB820 system is used to organize all field wiring (sensor 24V DC, analog signals, digital I/O) and internal power distribution for controllers, power supplies, and relays.
• Motor Control Centers (MCCs): Provides the termination points for motor power cables, control circuit wiring, and interlocking signals within MCC buckets.
• Power Distribution Cabinets: Used for distributing main AC power to various branches, creating organized tap points for circuit breakers and contactors.
• Machine Control Cabinets: Forms the central wiring hub for all electrical connections on industrial machinery, bringing signals from operator stations, sensors, and drives to the central controller.
• Process Instrumentation Panels: Organizes connections for 4-20mA signal loops, thermocouple wires, and RTD cables from field transmitters to the process control system.

Comparison with Competing Products

Competing products are modular terminal block systems from other major electrical component manufacturers, such as Phoenix Contact (CLIPLINE series), WAGO (TOPJOB® S), and Weidmüller (W Series). The ABB TB820 differentiates itself through its strong brand reputation in power and automation and its integration within ABB’s broader panel-building ecosystem. Compared to basic, non-modular terminal strips, the TB820 system offers superior flexibility, safety features (like disconnects), and organization. Its primary advantage for many engineers is the consistency and one-stop-shop convenience when specifying other ABB components like circuit breakers, contactors, and drives for a complete panel solution.

Selection Suggestions and Precautions

• Selection Suggestions:
  1. Select the ABB TB820 system based on the specific electrical requirements of each circuit: choose the correct current rating, voltage rating, and functional type (e.g., standard feed-through, fused, disconnectable, grounding).
  2. Plan the terminal layout in the panel carefully. Group terminals logically (e.g., all DC power together, all analog inputs together) and leave space for future expansion.
  3. Utilize the full system by selecting appropriate accessories like bridge connectors for commoning terminals, end covers for safety, and a clear marking system.
• Precautions:
  1. Correct Torque: Always use a calibrated torque screwdriver to tighten the terminal screws to the manufacturer’s specified value. Over-tightening can damage the clamp or wire, while under-tightening leads to high-resistance connections and overheating.
  2. Wire Preparation: Strip wires to the correct length. Ensure no stray strands are present that could cause a short circuit. Use ferrules on fine-stranded wires for best results.
  3. Separation of Circuits: Maintain proper separation between terminals carrying different voltage levels or signal types (e.g., high-voltage AC and low-level analog signals) according to electrical code and good practice to prevent noise and safety hazards.
  4. DIN Rail Grounding: Ensure the DIN rail itself is properly grounded if required by the terminal block design or local regulations.
  5. Sourcing and Compatibility: Source ABB TB820 blocks and accessories from authorized distributors to ensure authenticity. When building rows, ensure all blocks are from the same series for proper mechanical fit and electrical characteristics. Always refer to the official ABB catalog for the exact technical data of the specific TB820 variant you are using.

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