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ABB 3BSE068891R1 TU819
ABB 3BSE068891R1 TU819 is a Compact Module Termination Unit (MTU) designed for the ABB S800 I/O system. It provides the interface between field wiring and S800 I/O modules, handling signal termination, ModuleBus distribution, and mechanical configuration for compatible I/O modules.
1. Product Overview
The TU819 is a 50 V compact MTU with 32 signal connections. It is a passive termination unit used to connect field devices to S800 I/O modules and includes part of the ModuleBus interface. It distributes ModuleBus communication to the I/O module and the next MTU while providing correct module addressing through position signal shifting.
Product Identification
- Manufacturer: ABB
- Product Type: Compact Module Termination Unit (MTU)
- Model: TU819
- Article Number: 3BSE068891R1
- System: ABB S800 I/O / System 800xA environments
2. Technical Parameters
| Parameter |
Specification |
| Type |
Compact MTU |
| Voltage rating |
50 V |
| Connection type |
25-pin D-sub |
| Number of channels |
32 |
| I/O compatibility |
DI818, DO818 |
| Process connection |
Two 25-pin D-sub connectors (male), up to 32 I/O signals |
| I/O configuration |
Single I/O |
| Mounting |
DIN rail, horizontal or vertical |
| Maximum current per I/O channel |
2.5 A |
| Maximum process connection current |
L1+ max 8 A, L2+ max 8 A |
| Dielectric test voltage |
500 V AC |
3. Structural Composition
The TU819 consists of:
- MTU base assembly
Provides mechanical support and electrical termination.
- D-sub signal connectors
Enables compact connection of field wiring and I/O modules.
- ModuleBus interface section
Provides communication and addressing functions between S800 I/O modules.
- Mechanical keying system
Uses two configurable mechanical keys to prevent incorrect I/O module installation.
- DIN rail mounting latch
Provides secure mounting and grounding connection.
4. Product Features
- Compact installation design for S800 I/O modules
- Supports up to 32 field signals
- Fast connection through 25-pin D-sub interface
- Passive termination design, no external power required
- Mechanical protection against incorrect module insertion
- DIN rail mounting capability
- Suitable for industrial process control applications
5. Dimensions and Environmental Data
| Item |
Specification |
| Width |
64 mm (including connector) |
| Depth |
64 mm |
| Height |
170 mm (including latch) |
| Weight |
Approx. 0.17 kg |
| Operating temperature |
0 to +55 °C |
| Storage temperature |
-40 to +70 °C |
| Protection class |
IP20 |
| Relative humidity |
5–95%, non-condensing |
| EMC compliance |
EN 61000-6-4 / EN 61000-6-2 |
6. Application Fields
The ABB TU819 is commonly used in:
- Process automation systems
- Chemical and petrochemical plants
- Power generation facilities
- Oil & gas control systems
- Water treatment systems
- Manufacturing automation
- ABB System 800xA distributed control system (DCS) installations
It is typically installed together with ABB S800 I/O modules such as DI818 digital input modules and DO818 digital output modules.
7. Conclusion
The ABB 3BSE068891R1 TU819 is a compact, reliable MTU solution for ABB S800 I/O architectures. With 32-channel support, 50 V operation, D-sub connectivity, and DIN rail mounting, it provides a practical interface between field wiring and ABB I/O modules in industrial automation and process control applications.
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