ABB TB820 3AFE63941450

Description

Product Overview

The ABB TB820 3AFE63941450 is a robust and versatile Terminal Board designed as an accessory for connecting field wiring to ABB’s modular motor starters, particularly those in the Tmax XT series of molded case circuit breakers (MCCBs) or other compatible protection and control devices. This terminal board is a passive, yet critical, hardware interface that provides organized and secure screw terminals for both power and control circuit connections. Its primary function is to serve as an extension and organization point, allowing for the neat termination of incoming power cables, outgoing load cables, and auxiliary control wires (such as shunt trip, under-voltage release, or alarm contacts) directly onto the associated breaker or starter module. For detailed mechanical drawings, wiring diagrams, and compatibility lists, please refer to the official product resource: ABB TB820 3AFE63941450. The ABB TB820 simplifies cabinet wiring, enhances safety by providing clear terminal demarcation, and ensures a reliable connection interface for the motor starter assembly.

Product Parameters and Specifications

• Function: Terminal Board / Connection Interface for Motor Starters (e.g., Tmax XT Breakers).
• Compatibility: Specifically designed to mount onto or adjacent to specific ABB motor starter components, such as the XT1, XT2, XT3, or XT4 series circuit breakers or combination starters.
• Terminal Configuration: Features multiple, high-quality screw-clamp terminals. The configuration typically includes:
  • Main Power Terminals: Large terminals for line (L1, L2, L3) and load (T1, T2, T3) connections.
  • Auxiliary Control Terminals: Smaller terminals for connecting auxiliary contacts (NO/NC), shunt trip coils, under-voltage releases (UV), and alarm signals.
• Material & Construction: Made of flame-retardant, high-strength thermoplastic with metal (often tin-plated copper) current-carrying parts, designed for long-term reliability and corrosion resistance.
• Mounting: Designed for easy mounting on a standard DIN rail (TS35) or direct attachment to the associated breaker/starter unit via a specific mechanical interface.
• Markings & Labeling: Clearly marked with standardized symbols (IEC/NFPA) for each terminal (L1, L2, L3, T1, T2, T3, A1, A2, etc.) and often includes a space for user-applied wire markers.
• Safety & Certification: Complies with relevant international standards for electrical safety and insulation.

Advantages and Key Features

The ABB TB820 3AFE63941450 offers significant practical advantages during panel building and maintenance. Its primary benefit is greatly simplified and organized wiring, reducing installation time and minimizing errors by providing a clear, dedicated point for every connection. The use of secure screw-clamp terminals ensures a reliable, gas-tight connection that can withstand vibration, which is superior to relying on the sometimes-limited terminals on the breaker itself. The terminal board improves safety by providing clear physical separation between power and control circuits and reducing the risk of accidental contact with live parts during maintenance. As a genuine ABB accessory, the TB820 guarantees a perfect mechanical fit and electrical compatibility with the associated starter, ensuring proper alignment and current-carrying capacity. It also facilitates future modifications or troubleshooting by making all connection points easily accessible and identifiable.

Application Cases in Industry

This terminal board is used in virtually every industry where ABB Tmax XT motor starters are deployed in control panels and motor control centers (MCCs). In a Water Treatment Plant, it would be used on the starter for a raw water intake pump. Within a Packaging Factory, it organizes the connections for conveyor motor starters. For a HVAC System in a large building, it is found on the starters controlling chillers and air handling unit fans. The ABB TB820 is also common in Oil & Gas pump control panels and Manufacturing assembly line control cabinets. Any application using a modular ABB starter for motor control from a few to several hundred kilowatts will likely utilize this terminal board.

Comparison with Competing Products

• vs. Connecting Directly to Breaker Terminals: Many breakers have integrated terminals, but these can be cramped, poorly marked, or insufficient for all required auxiliary connections. The TB820 provides a superior, expanded, and organized interface that simplifies the work.
• vs. Generic Terminal Blocks: A panel builder could use a set of individual terminal blocks. However, the ABB TB820 is pre-configured, pre-marked, and designed as a single unit that mounts directly to the starter, offering a cleaner, more professional, and time-saving solution. It also ensures the correct terminal types and ratings are used.
• vs. Other Brand Starter Terminal Kits: Competing manufacturers (e.g., Schneider, Siemens) have similar kits for their starters. The TB820 is distinguished by its exact fit and design optimization for ABB Tmax XT products. It is the recommended and supported accessory.

Selection Suggestions and Precautions

• Selection Advice:
  1. Starter Compatibility is Key: The most critical step is to verify that the ABB TB820 is listed as compatible with the exact model of your circuit breaker or starter (e.g., Tmax XT2S 160). Use ABB’s catalog or configurator tools to confirm.
  2. Auxiliary Function Requirements: Review which auxiliary devices are installed on your starter (e.g., shunt trip, auxiliary contact). Ensure the TB820 has a sufficient number and type of auxiliary terminals to accommodate them all.
  3. Wire Size Verification: Check that the terminal board’s screw terminals accept the wire gauge (both power and control) specified for your application.
  4. Order as a Kit: Often, the terminal board like the TB820 is part of a larger mounting kit that may include other hardware. Verify what is included in the purchase.
• Important Precautions:
  1. Torque Specifications: When terminating wires, always use a calibrated torque screwdriver and follow ABB’s specified tightening torque for each terminal size. Over-torquing can damage the terminal; under-torquing can lead to a high-resistance connection, overheating, and failure.
  2. Use of Ferrules: For stranded wires, always use insulated crimp ferrules on the wire ends before inserting them into the screw terminals. This ensures a solid, reliable connection and prevents stray strands.
  3. Phase Separation and Clearances: When wiring, maintain proper electrical clearance between phases as per codes. The TB820 is designed to provide this, but the installer must ensure wires are dressed neatly.
  4. Labeling: Take the time to label all wires at the terminal board according to the markings. This is invaluable for future troubleshooting and modifications.

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