Description

ABB TU845 3BSE021447R1 Module Termination Unit

Configured for terminal-level I/O termination in ABB control hardware, the ABB TU845 3BSE021447R1 (TU845 Module Termination Unit) provides an 8-channel physical connection interface. It uses a terminal block connection and supports redundant configurations with a maximum 50 V operating voltage.

Hardware Specifications

Parameter	Specification
Model	TU845 3BSE021447R1
Spare Model	3BSE021447R1
Brand	ABB
Product Type	Module Termination Unit
Origin	Sweden
Weight	0.58 kg
Dimensions	18.5 x 13 x 6.2 cm estimated shipping size
Type	Redundant
Connection	Terminal block
Channels	8
Maximum Voltage	50 V
Maximum Current per I/O Channel	2 A
Maximum Current at Process Connection	5 A
Dielectric Test Voltage	500 V AC
Operating Temperature	0 to +55 deg C
Storage Temperature	-40 to +70 deg C

ABB I/O Termination and Backplane Interface

The TU845 provides terminal-level termination for eight I/O channels. Therefore, field wiring connects directly through the terminal block rather than through a separate signal termination assembly.

The unit supports a maximum 50 V voltage level and limits each I/O channel to 2 A. In addition, the process connection supports a maximum current of 5 A. These limits define the electrical loading conditions for connected field circuits.

The supplied data identifies the TU845 as a redundant termination unit. However, the data does not specify a backplane communication protocol, communication velocity, firmware dependency, or I/O module compatibility matrix. These parameters should therefore be verified against the associated ABB I/O system documentation before installation.

The specified 500 V AC dielectric test voltage provides the stated insulation test level between applicable electrical sections. Installation should maintain the manufacturer's wiring and insulation requirements.

Frequently Asked Questions

Q: How many I/O channels does the TU845 provide?
A: The TU845 provides 8 terminal connections for I/O channels.

Q: What are the stated current limits?
A: Each I/O channel supports a maximum current of 2 A, while the process connection supports a maximum current of 5 A.

Q: What operating temperature range does the TU845 support?
A: The specified operating range is 0 to +55 deg C. The storage range is -40 to +70 deg C.

Field Installation Guidelines

1. Mount the TU845 according to the mechanical arrangement specified for the associated ABB control system.
2. Verify terminal assignments before connecting field conductors.
3. Keep signal wiring separated from high-voltage and high-current power conductors where the cabinet design permits.
4. Confirm that connected circuits remain within the 50 V maximum voltage specification.
5. Limit individual I/O channel current to 2 A and process connection current to 5 A.
6. Route shielded signal cables according to the cabinet grounding design. Avoid creating unintended ground loops through multiple shield termination points.
7. Inspect terminal tightening and conductor seating before energizing the circuit.
8. Confirm the dielectric and insulation requirements of the complete installation before commissioning.
9. Maintain the specified operating temperature range during service.
10. Do not infer hot-swap capability, backplane current consumption, or firmware compatibility unless the associated ABB system documentation explicitly confirms those functions.

Specifications

• Brand: ABB

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems