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ABB TB820-1 3BSE008556R1 terminal unit

1. Product Description

The ABB TB820-1 3BSE008556R1 is a high-reliability terminal unit designed for industrial automation systems, serving as a dedicated wiring interface between ABB AC 800M DCS modules (e.g., I/O modules, communication modules) and field devices. It acts as a centralized 转接 hub for signal and power wiring, simplifying the connection process between the control system backplane and on-site sensors, actuators, or communication devices. The terminal unit features standardized terminal blocks, clear wiring labels, and industrial-grade insulation materials, ensuring secure signal transmission and easy maintenance. With a compact DIN rail-mounted design and compatibility with various AC 800M module types, it provides a neat, organized wiring solution for industrial control cabinets, reducing wiring errors and improving system maintainability.

2. Detailed Parameters

Parameter Category	Specifications
Model Number	TB820-1 (Order Code: 3BSE008556R1)
Terminal Type	Screw-type terminal blocks (for copper conductors)
Number of Terminals	32 terminals (16 pairs for signal/power wiring)
Rated Voltage	250 V AC/DC (max)
Rated Current	10 A per terminal (continuous operation)
Conductor Size	0.2 - 2.5 mm² (solid or stranded copper wire, with ferrule recommended for stranded wire)
Insulation Material	Polyamide (PA), flame-retardant (UL94 V-0)
Operating Temperature	-40°C to +85°C
Dimensions (W×H×D)	48.3 × 100 × 60 mm
Mounting Method	DIN rail mounting (compatible with standard 35 mm DIN rails, EN 50022)
Compatibility	ABB AC 800M series modules (AI801, DI801, CI858K01, etc.)
Certification	CE, UL, IEC 60947-1 (industrial control equipment safety standard)

3. Advantages & Features

Simplified Wiring Management: 32 standardized screw-type terminals provide centralized wiring for signal and power, replacing scattered point-to-point connections and reducing wiring complexity in control cabinets.

High Safety Performance: Flame-retardant polyamide insulation (UL94 V-0) and 250 V AC/DC rated voltage ensure safe operation even in high-voltage industrial environments; 10 A terminal current capacity meets most field device wiring needs.

Strong Compatibility: Specifically designed for ABB AC 800M series modules, it perfectly matches the pinout and wiring requirements of I/O and communication modules, avoiding compatibility issues with non-standard terminals.

Easy Maintenance: Clear terminal numbering and labeling positions allow quick identification of wiring connections; screw-type terminals enable tool-free wire replacement (with standard screwdriver), reducing maintenance time.

Wide Temperature Adaptability: Operates in -40°C to +85°C temperature range, adapting to extreme temperature fluctuations in industrial sites such as steel mills, cold storage, or outdoor control cabinets.

4. Application Fields

Industrial Control Cabinet Wiring: Serving as a dedicated terminal interface for AC 800M I/O modules (e.g., AI801, DO801) in control cabinets, connecting modules to field sensors (temperature, pressure) and actuators (valves, motors).

Communication Module Connection: Matching with AC 800M communication modules (e.g., CI858K01, CI853K01) to 转接 RS485/Ethernet signals between modules and field communication devices (HMIs, barcode scanners).

Power Distribution in Control Systems: Distributing 24 V DC power from the system power supply to multiple AC 800M modules via dedicated power terminals, ensuring stable power supply for each module.

Harsh Environment Control Systems: Used in high-temperature (e.g., metallurgical plants) or low-temperature (e.g., food cold storage) control systems, providing reliable wiring connections under extreme temperatures.

5. Precautions

Wire Selection: Use copper conductors with 0.2-2.5 mm² cross-sectional area; for stranded wires, install wire ferrules to prevent wire strands from loosening and causing poor contact.

Torque Control: Tighten terminal screws to the recommended torque (0.8-1.2 N·m) during wiring; over-tightening may damage terminals, while under-tightening may lead to poor contact and overheating.

Voltage/Current Limits: Do not exceed the terminal’s rated voltage (250 V AC/DC) or current (10 A); overloading may cause terminal insulation damage or fire risks.

Insulation Check: Before power-on, use a multimeter to check the insulation resistance between terminals (≥10 MΩ at 500 V DC) to avoid short circuits caused by insulation failure.

Environmental Protection: Install the terminal unit in a dustproof, waterproof control cabinet (IP54 or higher) in humid or dusty environments; avoid direct exposure to oil, chemicals, or water droplets.

The structure and details of the product：

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