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ABB TU838 3BSE008572R1 Extension Module Terminal Unit Product Information

I. Product Description

II. Detailed Technical Parameters

1. Core Terminal & Signal Characteristics

2. Electrical & Mechanical Parameters

• Operating Voltage: Powered by the S800 I/O system backplane (5V DC, supplied by the master terminal unit, e.g., TU845), no external power required.
• Insulation Resistance: ≥100 MΩ (at 500V DC, between terminals and ground), minimizing signal leakage.
• Dielectric Strength: 2.5 kV AC (50/60 Hz) for 1 minute (between terminals and ground), resisting voltage surges.
• Dimensions (W×H×D): 120 mm × 150 mm × 62 mm (compact design, fits standard 35mm DIN rails).
• Weight: ~0.45 kg (lightweight for easy stacking in control cabinets).
• Mounting Type: DIN rail mounting (EN 60715: 35mm, T-profile), enabling fast installation and modular arrangement.

3. Environmental Adaptability

• Operating Temperature: -20°C to +60°C (wide range for cold warehouses, high-temperature process areas).
• Storage Temperature: -40°C to +70°C (suitable for long-term storage in unconditioned warehouses).
• Protection Class: IP20 (dust-proof, protected against solid objects >12mm; ideal for control cabinet installation).
• Vibration Resistance: 5-150 Hz, 0.5g (meets IEC 60068-2-6 standards, stable for machinery-mounted cabinets).
• Humidity Tolerance: 5-95% RH (non-condensing), resisting moisture in food/beverage or chemical plants.

III. Product Advantages & Key Features

1. Modular Expansion & Flexibility

• Seamless S800 I/O Integration: Works as an extension of master terminal units (e.g., TU844, TU845), allowing the S800 I/O system to scale from 8 to hundreds of channels without redesigning the wiring architecture.
• Channel Configurability: Each terminal channel can be freely assigned to analog or digital signals (via software or hardware jumpers), adapting to mixed-signal scenarios (e.g., combining temperature sensors and limit switches).

2. Reliable Signal Transmission

• Tool-Free Spring-Clamp Terminals: Eliminate human error from screw tightening; ensure consistent contact force even under vibration, reducing loose connections—a common cause of industrial downtime.
• Anti-Interference Design: When paired with ABB’s isolated I/O modules, the TU838 minimizes electromagnetic interference (EMI) from nearby motors or power cables, preserving signal integrity for precision control (e.g., process pressure/temperature measurements).

3. Easy Installation & Maintenance

• Centralized Wiring Management: All field wires terminate at the TU838, simplifying cable routing and labeling—technicians can quickly trace signals without disassembling control modules.
• Visual Status Indicators: Integrated LED lights (per channel) for power and signal presence, enabling real-time fault diagnosis (e.g., open circuits, short circuits) and reducing troubleshooting time.

4. Industrial-Grade Durability

• Rugged Housing: Constructed from flame-retardant PC/ABS plastic (UL94 V-0 rating), resisting high temperatures and mechanical impact.
• Conformal Coated PCB: Optional conformal coating (for harsh environments) protects internal circuits from dust, oil, and corrosive gases (common in chemical/petrochemical plants).

The structure and details of the product：

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