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ABB TU844 Module Termination Unit

Configured for module termination and field wiring interface functions in ABB S800 I/O installations, the ABB TU844 3BSE021445R1 (TU844 Module Termination Unit) provides the physical termination point between field wiring and the associated I/O module. The supplied data identifies the unit as a compact module termination component and lists it as discontinued by the manufacturer.

Hardware Specifications

Parameter	Specification
Model	TU844
Spare Model	3BSE021445R1
Brand	ABB
Product Type	Module Termination Unit
Product Description	Compact Module Termination Unit
Weight	0.58 kg
Dimensions	Estimated shipping size: 13.5 x 13 x 6.5 cm
Manufacturer Status	Discontinued by manufacturer

ABB S800 I/O Termination Characteristics

The TU844 provides a physical termination interface for an ABB S800 I/O assembly. Therefore, installation should maintain correct mechanical seating and field-wiring routing according to the associated ABB I/O hardware documentation.

The supplied data does not define channel count, terminal assignments, rated voltage, current capacity, isolation characteristics, or backplane electrical consumption. Consequently, these parameters should not be inferred from the TU844 model designation.

For ABB S800 I/O systems, the termination unit forms part of the module-level hardware arrangement. In addition, technicians should verify the compatible I/O module and mounting configuration before replacement or commissioning.

Frequently Asked Questions

Q: What is the primary function of the ABB TU844?

A: The TU844 functions as a Module Termination Unit that provides the physical termination interface for associated ABB S800 I/O hardware.

Q: Does the supplied specification define TU844 electrical ratings?

A: No. The supplied data does not specify operating voltage, current rating, isolation, power consumption, or terminal electrical limits.

Q: Is TU844 a current ABB product?

A: The supplied description identifies TU844, spare number 3BSE021445R1, as discontinued by the manufacturer.

Field Installation Guidelines

1. Verify the exact TU844 model and spare number before installation.
2. Confirm mechanical compatibility with the associated ABB S800 I/O module and mounting arrangement.
3. Isolate the relevant control-system power before removing or installing field termination hardware.
4. Route field wiring separately from high-voltage and high-noise conductors where practical.
5. Maintain secure terminal connections and prevent excessive mechanical loading on connected conductors.
6. Inspect the termination area for damaged terminals, loose conductors, contamination, or mechanical deformation.
7. Follow the ABB system installation documentation for grounding, shielding, terminal assignments, and module-specific wiring requirements.
8. After installation, verify wiring continuity and correct signal identification before returning the associated I/O circuit to service.

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