The ABB TU838 (3BSE008572R1) is an S800 I/O Extended Module Termination Unit designed for ABB distributed control systems. It provides the electrical and mechanical interface between field wiring and S800 I/O modules within System 800xA architectures.
This MTU distributes process power, routes ModuleBus signals, and supports up to 16-channel I/O configurations. It is widely used in process automation environments where stable signal termination and modular expansion are required.
The TU838 supports fused transducer power outputs, redundant L+ / L- supply paths, and mechanical coding to prevent incorrect module installation.
16-channel S800 I/O termination unit
Compatible with ABB System 800xA and Advant OCS
Integrated fused transducer power distribution
Mechanical keying system prevents incorrect module insertion
DIN rail mounting with integrated grounding latch
Redundant L+ / L- process power support
Automatic ModuleBus sequential addressing
Designed for industrial process automation systems
| Parameter | Specification |
|---|---|
| Brand | ABB |
| Model | TU838 |
| Product ID | 3BSE008572R1 |
| System Series | S800 I/O (System 800xA / Advant OCS) |
| Type | Extended Module Termination Unit |
| Channels | 16 I/O channels |
| Max Voltage | 50 V DC |
| Max Current | 3 A per channel |
| Total Current | 10 A max |
| Process Power | L+ / L- redundant |
| Fuse Type | 100 mA fast-blow (up to 3.5 A field replaceable) |
| ModuleBus Rating | 1.5 A @ 5 V / 24 V |
| Mounting | 35 mm DIN rail |
| Protection | IP20 (IEC 60529) |
| Dimensions | 58.5 × 64 × 170 mm |
| Weight | 0.375 kg |
| Origin | Sweden |
| HS Code | 85369095 |
The TU838 operates as a passive termination and distribution module within S800 I/O systems. It does not process signals but provides structured routing between field devices and I/O modules.
ModuleBus communication uses sequential slot detection, allowing automatic addressing without software configuration. Each MTU passes position signals to the next unit in the DIN rail chain.
The unit also distributes process power through fused output groups, protecting connected field instruments from overload conditions.
Proper installation is required for stable system performance.
Mount the unit on a 35 mm DIN rail in a horizontal position. Ensure the DIN rail is properly grounded using low-impedance bonding to the cabinet earth system.
Maintain a wire stripping length of 7 mm and tighten terminal screws to 0.5–0.6 Nm. Use proper separation between signal wiring and AC power lines to reduce electromagnetic interference.
Field wiring is divided into 16 signal channels with grouped fused transducer outputs. Some configurations allow shared fuse groups depending on module design.
The TU838 includes a dual mechanical keying system with six selectable positions per key, enabling 36 configuration combinations.
This prevents incorrect insertion of S800 I/O modules such as AI810, DI810, or DO814. The system ensures mechanical compatibility and protects internal circuits from incorrect field voltage exposure.
Stable operation requires proper grounding and EMC design.
The DIN rail acts as a functional earth connection through the integrated latching mechanism. The cabinet must be connected to a low-impedance grounding system using copper braid.
Signal cables should be separated from power cables to minimize noise coupling. Avoid long parallel routing between high-voltage and low-voltage lines.
The ABB TU838 is used in:
Industrial process automation systems
Oil and gas control systems
Power generation plants
ABB System 800xA DCS architectures
Large-scale factory automation
Safety-critical instrumentation networks
Product ID: 3BSE008572R1
ABB Type: TU838
System: S800 I/O
Minimum Order Quantity: 1 piece
What is the function of TU838 in S800 I/O systems?
It provides signal termination, power distribution, and ModuleBus routing between field wiring and I/O modules.
Does TU838 require software configuration?
No. Module addressing is handled automatically through sequential ModuleBus signaling.
Can the fuses be replaced?
Yes. Fuses are field replaceable and can be upgraded depending on application requirements.
What happens if grounding is incorrect?
Improper grounding may lead to EMC interference, unstable signals, or system communication errors.
Global Express Shipping
Returns & Warranty
Manufacturer: ABB
Product No.: TU838 3BSE008572R1
Country of origin:Switzerland
Product Type: TU838 Extended Module Termination Unit
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 375g
Dimensions: 58.5 × 64 × 170 mm
Shipping port: Xiamen
Warranty: 12 months
The ABB TU838 (3BSE008572R1) is an S800 I/O Extended Module Termination Unit designed for ABB distributed control systems. It provides the electrical and mechanical interface between field wiring and S800 I/O modules within System 800xA architectures.
This MTU distributes process power, routes ModuleBus signals, and supports up to 16-channel I/O configurations. It is widely used in process automation environments where stable signal termination and modular expansion are required.
The TU838 supports fused transducer power outputs, redundant L+ / L- supply paths, and mechanical coding to prevent incorrect module installation.
16-channel S800 I/O termination unit
Compatible with ABB System 800xA and Advant OCS
Integrated fused transducer power distribution
Mechanical keying system prevents incorrect module insertion
DIN rail mounting with integrated grounding latch
Redundant L+ / L- process power support
Automatic ModuleBus sequential addressing
Designed for industrial process automation systems
| Parameter | Specification |
|---|---|
| Brand | ABB |
| Model | TU838 |
| Product ID | 3BSE008572R1 |
| System Series | S800 I/O (System 800xA / Advant OCS) |
| Type | Extended Module Termination Unit |
| Channels | 16 I/O channels |
| Max Voltage | 50 V DC |
| Max Current | 3 A per channel |
| Total Current | 10 A max |
| Process Power | L+ / L- redundant |
| Fuse Type | 100 mA fast-blow (up to 3.5 A field replaceable) |
| ModuleBus Rating | 1.5 A @ 5 V / 24 V |
| Mounting | 35 mm DIN rail |
| Protection | IP20 (IEC 60529) |
| Dimensions | 58.5 × 64 × 170 mm |
| Weight | 0.375 kg |
| Origin | Sweden |
| HS Code | 85369095 |
The TU838 operates as a passive termination and distribution module within S800 I/O systems. It does not process signals but provides structured routing between field devices and I/O modules.
ModuleBus communication uses sequential slot detection, allowing automatic addressing without software configuration. Each MTU passes position signals to the next unit in the DIN rail chain.
The unit also distributes process power through fused output groups, protecting connected field instruments from overload conditions.
Proper installation is required for stable system performance.
Mount the unit on a 35 mm DIN rail in a horizontal position. Ensure the DIN rail is properly grounded using low-impedance bonding to the cabinet earth system.
Maintain a wire stripping length of 7 mm and tighten terminal screws to 0.5–0.6 Nm. Use proper separation between signal wiring and AC power lines to reduce electromagnetic interference.
Field wiring is divided into 16 signal channels with grouped fused transducer outputs. Some configurations allow shared fuse groups depending on module design.
The TU838 includes a dual mechanical keying system with six selectable positions per key, enabling 36 configuration combinations.
This prevents incorrect insertion of S800 I/O modules such as AI810, DI810, or DO814. The system ensures mechanical compatibility and protects internal circuits from incorrect field voltage exposure.
Stable operation requires proper grounding and EMC design.
The DIN rail acts as a functional earth connection through the integrated latching mechanism. The cabinet must be connected to a low-impedance grounding system using copper braid.
Signal cables should be separated from power cables to minimize noise coupling. Avoid long parallel routing between high-voltage and low-voltage lines.
The ABB TU838 is used in:
Industrial process automation systems
Oil and gas control systems
Power generation plants
ABB System 800xA DCS architectures
Large-scale factory automation
Safety-critical instrumentation networks
Product ID: 3BSE008572R1
ABB Type: TU838
System: S800 I/O
Minimum Order Quantity: 1 piece
What is the function of TU838 in S800 I/O systems?
It provides signal termination, power distribution, and ModuleBus routing between field wiring and I/O modules.
Does TU838 require software configuration?
No. Module addressing is handled automatically through sequential ModuleBus signaling.
Can the fuses be replaced?
Yes. Fuses are field replaceable and can be upgraded depending on application requirements.
What happens if grounding is incorrect?
Improper grounding may lead to EMC interference, unstable signals, or system communication errors.
| Product Image | Model Number / Title | Condition | Availability | Action |
|---|---|---|---|---|
|
ABB 3BSE008544R2 AI820-eA S800 I/O Analog Input Module | Original New | In Stock | View Details |
|
ABB 3BSE008546R2 AO820-eA S800 Analog Output Module | Original New | In Stock | View Details |
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Color pattern |
Greyish White
|
| Country of origin |
Switzerland
|
| Power source |
DC Power
|
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