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ABB TU840 3BSE020846R1 Termination Unit

Configured for redundant I/O termination in the ABB Modulebus architecture, the ABB TU840 3BSE020846R1 (TU840 Termination Unit) provides the physical and electrical interface for a 1+1 TB840 configuration. It includes a power supply connector and TB807 Modulebus terminator interface.

Hardware Specifications

Parameter	Specification
Model	TU840 3BSE020846R1
Base Model	TU840
Spare Model	3BSE020846R1
Product Type	Termination Unit
Manufacturer	ABB
Origin	Sweden
Weight	0.42 kg
Dimensions	Estimated shipping size: 18.5 x 12.2 x 4.7 cm
Application	For 1+1 TB840
I/O Configuration	Supports redundant I/O
Communication Protocol	Modulebus
Power Input	24 VDC
Mounting	Vertical or horizontal
Modulebus Current Distribution	Maximum 5 V, 1.5 A; 24 V, 1.5 A
Mechanical Keys	36 different combinations
Rated Insulation Voltage	50 V
Dielectric Test Voltage	500 VAC
Power Dissipation	2.0 W
Operating Temperature	0 to +55 deg C; approvals issued for +5 to +55 deg C
Storage Temperature	-40 to +70 deg C
Relative Humidity	5 to 95 %, non-condensing
Tariff Code	8537101190
Place of Shipment	Xiamen, China

ABB Modulebus and Redundant I/O Interface

The TU840 terminates and distributes electrical connections associated with a 1+1 TB840 redundant I/O arrangement. The unit provides a dedicated power supply connector and accepts the TB807 Modulebus terminator.

Furthermore, the specified Modulebus current distribution reaches 1.5 A at 5 V and 1.5 A at 24 V. Therefore, installation planning should keep the connected module load within these stated distribution limits.

The mechanical keying system provides 36 different combinations. This feature controls physical module positioning and helps prevent incompatible module or termination-unit combinations during installation.

Frequently Asked Questions

Q: What TB840 configuration does the TU840 support?
A: The TU840 is specified for a 1+1 TB840 configuration and supports redundant I/O.

Q: What power distribution does the TU840 provide?
A: The specified maximum Modulebus current distribution is 1.5 A at 5 V and 1.5 A at 24 V.

Q: What mounting orientations are permitted?
A: The supplied specification permits both vertical and horizontal mounting.

Field Installation Guidelines

1. Verify the complete part number TU840 3BSE020846R1 before installation.
2. Confirm that the termination unit matches the intended 1+1 TB840 redundant configuration.
3. Install the unit in the specified vertical or horizontal orientation.
4. Connect the 24 VDC power input with correct polarity and suitable industrial wiring practices.
5. Keep the connected Modulebus load within the specified 5 V and 24 V current distribution limits.
6. Install the TB807 Modulebus terminator at the designated interface.
7. Use the mechanical keying arrangement to prevent an incorrect module combination.
8. Route power and communication wiring to minimize unnecessary coupling with high-current or high-noise conductors.
9. Verify terminal tightness and connector seating before energizing the assembly.
10. Confirm that the installation environment remains within the specified temperature and humidity limits.

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