Product Overview
The ABB TU805 is a 16-channel 50 V terminal unit engineered for the S800 I/O family, specifically pairing with DI801 and DO801 modules. As a passive distribution unit, the TU805 routes external process power to field devices with minimal complexity. Its compact form factor mounts directly onto the I/O module, eliminating extra space requirements and simplifying cabinet layouts.
This terminal unit enables both 2-wire and 3-wire connections of process signals, offering flexibility for various sensor and actuator configurations. With a maximum current of 1 A per I/O channel and support for solid or stranded wires from 0.2 to 1.5 mm² (24–16 AWG), the TU805 accommodates standard industrial wiring practices.
Key Features & Benefits
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Direct mounting: Attaches directly to the I/O module, saving panel space.
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Passive design: No active components, ensuring high reliability.
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Versatile wiring: Supports 2- and 3-wire process signal connections.
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Wide environmental tolerance: Operates from 0 to +55 °C (approvals for +5 to +55 °C) and stores from -40 to +70 °C.
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Global certifications: CE, cULus (Hazardous Location), ATEX Zone 2, DNV-GL marine approval.
Technical Specifications
| Parameter |
Value |
| Model |
ABB TU805 |
| Article Number |
3BSE035990R1 |
| Channels |
16 |
| Voltage |
50 V |
| Maximum Current per Channel |
1 A |
| Wire Size (Solid) |
0.2 – 1.5 mm² |
| Wire Size (Stranded) |
0.2 – 1.5 mm², 24–16 AWG |
| Dielectric Test Voltage |
500 V a.c. |
| Process Connections |
2 x 2 Process power terminals, 2 x 16 Process power distribution terminals |
| Operating Temperature |
0 to +55 °C (+32 to +131 °F); approvals for +5 to +55 °C |
| Storage Temperature |
-40 to +70 °C (-40 to +158 °F) |
| Relative Humidity |
5 to 95 %, non-condensing |
| Protection Class |
IP20 per IEC 60529 |
| Dimensions (W x D x H) |
86.1 x 40.5 x 40.5 mm |
| Weight |
0.3 kg |
Applications
The ABB TU805 excels in discrete control applications where reliable signal distribution is critical. Typical use cases include:
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Process automation: Connecting limit switches and proximity sensors to DI801 input modules in chemical or pharmaceutical plants.
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Machine building: Wiring solenoid valves and indicator lamps to DO801 output modules in packaging machinery.
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Material handling: Distributing power to sensors on conveyor systems, ensuring consistent operation in dusty environments.
Its hazardous location certifications (C1 Div 2, Zone 2, ATEX) make it suitable for oil & gas and other potentially explosive atmospheres.
Installation Guidance
Mount the ABB TU805 directly onto the S800 I/O module using the provided locking mechanism. Ensure the terminal unit is firmly seated to guarantee proper electrical contact. For wiring, strip wires to the recommended length and insert into the spring-cage terminals. Use a screwdriver to open the clamp, insert the wire, and release. Verify each connection by gently pulling the wire. The terminal unit requires no additional space beyond the I/O module footprint, so plan panel layout accordingly.
Maintenance & Reliability
The passive design of the TU805 minimizes maintenance needs. Periodically inspect the terminal connections for tightness, especially after thermal cycling. Keep the terminal unit free of dust and moisture to maintain its IP20 rating. In corrosive environments, the ISA-S71.04 G3 corrosion protection ensures long-term reliability. Regular visual checks every 6 to 12 months are sufficient for most installations.
Compatibility & Integration
The ABB TU805 is designed exclusively for use with S800 I/O modules DI801 (digital input) and DO801 (digital output). It integrates seamlessly into ABB's S800 system, which supports various fieldbus protocols (e.g., PROFIBUS DP, Foundation Fieldbus) via corresponding communication interfaces. The terminal unit distributes external process power to field devices, enabling a clean and organized wiring scheme.
Selection Guide
Before purchasing, verify that your I/O modules are DI801 or DO801 and that your system voltage does not exceed 50 V. The TU805 accepts wire sizes up to 1.5 mm², so confirm your cable gauge fits. For large installations, consider ordering the TU805K01 kit, which includes 10 pieces of the TU805, offering cost savings and convenient stocking. PLC Source PRO provides genuine ABB parts with fast worldwide shipping, ensuring minimal downtime for your operations.