Description

Product Analysis Report

Product Description

The ABB TK850 is a robust and versatile terminal block designed for the seamless connection of electrical signals within industrial control panels, particularly those housing Programmable Logic Controllers (PLCs) and Distributed Control Systems (DCS). Engineered for reliability in demanding environments, the ABB TK850 (product link: ABB TK850) serves as a critical interface point between field wiring from sensors and actuators and the internal wiring of the automation system. It belongs to a comprehensive terminal block family that prioritizes modularity and safety. The primary function of the ABB TK850 is to provide a secure, organized, and easily maintainable connection point, facilitating circuit testing, isolation, and modification without disturbing the core system wiring. Its design is integral to building a well-structured and serviceable control cabinet, making the ABB TK850 a preferred choice for panel builders and system integrators.

Product Parameters

• Manufacturer: ABB.
• Product Series: TK (Terminal Block) series.
• Model: TK850 (Specific type within the series).
• Type: Typically a feed-through, disconnect, or fuse terminal block (exact function depends on the suffix/model variant, e.g., TK850 F for fuse terminal).
• Rated Voltage: Commonly rated up to 800V.
• Rated Current: Typically rated for 32A or 41A, depending on the specific variant and conductor size.
• Connection Technology: Screw clamp connection for secure and reliable conductor termination.
• Cross-Sectional Area: Accommodates a wide range of conductor sizes, typically from fine-wire up to 10mm² or 12AWG to 2AWG.
• Mounting: Designed for snap-on mounting on DIN-rail (EN 60715 standard: 35mm x 7.5mm or 35mm x 15mm).
• Material: Flame-retardant thermoplastic housing (typically Polyamide PA6.6), copper alloy current bar.
• Standards: Complies with international standards such as IEC/EN 60947-7-1, UL 1059, and CSA.

Advantages and Features

• High Reliability & Safety: The screw clamp technology ensures a vibration-proof, gas-tight connection that maintains contact force over time, preventing overheating and failures.
• Modular Design & Flexibility: The ABB TK850 is part of a modular system, allowing for easy combination with other TK series blocks (bridges, end covers, markers) to create custom terminal assemblies.
• Excellent Organization: Clear marking areas and the ability to group related terminals improve cabinet layout, simplify wiring, and enhance maintenance and troubleshooting efficiency.
• Robust Construction: High-quality materials ensure resistance to environmental factors like temperature, humidity, and chemicals, guaranteeing long-term performance.
• Global Acceptance: As a product from a global leader, the ABB TK850 is widely available, recognized, and accepted by electrical inspectors and engineers worldwide.

Application Cases in Key Fields

• Factory Automation (PLC Panels): Used as the primary interface terminal for digital and analog I/O modules in Siemens, Allen-Bradley, or ABB PLC systems, connecting field devices like limit switches, solenoids, and transmitters.
• Process Industry (DCS Panels): Employed in marshalling cabinets to organize thousands of field instrument loops before they are connected to system I/O cards.
• Power Distribution & Motor Control Centers (MCCs): Serves as control terminal blocks for connecting start/stop signals, overload relay contacts, and indicator lights.
• Machinery & OEM Equipment: Integrated into control panels for packaging machines, presses, and conveyors to provide reliable and accessible connection points for all machine wiring.

Comparisons with Competing Products

The ABB TK850 competes directly with other high-quality DIN-rail terminal block series such as Phoenix Contact‘s UKD or WAGO‘s 2000 series. Compared to basic or economy terminal blocks, the ABB TK850 typically offers a higher current rating, superior material quality, and a more robust clamping mechanism. Its main advantages are ABB’s strong brand reputation for industrial electrical products and the comprehensive nature of its accessory system (markers, test plugs, etc.). When compared to spring-clamp competitors like WAGO, the ABB TK850‘s screw clamp may be preferred in applications subject to high vibration or where field technicians are more familiar with screw-based terminations.

Selection Suggestions and Precautions

• Determine the Exact Type: The base model ABB TK850 is often a feed-through terminal. Identify if you need a specific variant such as a fuse terminal (TK850 F), disconnect terminal (TK850 S), or ground terminal for the correct functionality.
• Verify Current and Voltage Ratings: Ensure the selected variant’s ratings exceed the maximum expected circuit values with an appropriate safety margin.
• Select Proper Conductor Type/Sizes: Confirm the terminal is rated for the type (stranded/solid) and size (mm² or AWG) of the wires you will be using.
• Consider Accessories: Plan for necessary accessories like end covers, partition plates, marker strips, and test plugs to build a complete, safe, and identifiable terminal assembly.
• Follow Torque Specifications: Always use a calibrated torque screwdriver to terminate wires. Under-tightening can lead to high resistance and overheating; over-tightening can damage the terminal or the conductor.

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