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ABB TU842 3BSE020850R1 Module Termination Unit

Configured for redundant I/O termination in ABB S800 I/O systems, the ABB TU842 3BSE020850R1 (TU842 Module Termination Unit) provides terminal-block connections for up to 16 I/O channels. It supports 50 V operation, horizontal mounting, and separate process-connection current limits.

Hardware Specifications

Parameter	Specification
Model	TU842 3BSE020850R1
Spare Model	3BSE020850R1
Brand	ABB
Product Type	Module Termination Unit
Configuration	Redundant
Connection	Terminal block
Channels	16
Voltage	50 V
Maximum Current per I/O Channel	3 A
Maximum Current Process Connection	10 A
Dielectric Test Voltage	500 VAC
Mounting	Horizontal
Mounting Detail	55 deg
Operating Temp	0 to +55 deg C; approvals issued for +5 to +55 deg C
Storage Temp	-40 to +70 deg C
Weight	0.6 kg
Dimensions	Estimated shipping size: 18.5 x 13 x 6 cm
Power Consumption	Not specified in the supplied data
Origin	Sweden

S800 I/O Termination and Redundancy

The TU842 uses a terminal-block connection structure for field-side I/O wiring. Its redundant configuration supports installations where the associated I/O architecture requires redundant termination.

The unit provides 16 channels and accepts up to 50 V. Meanwhile, the specified maximum current reaches 3 A per I/O channel and 10 A at the process connection. Therefore, field wiring must remain within both limits.

The dielectric test voltage is specified as 500 VAC. Installers should verify the associated I/O module, terminal arrangement, and system configuration before energizing the circuit.

Frequently Asked Questions (FAQ)

Q: How many I/O channels does the ABB TU842 3BSE020850R1 support?
A: The TU842 provides 16 I/O channels through its terminal-block connection arrangement.

Q: What are the specified current limits for the TU842?
A: The maximum current is 3 A per I/O channel and 10 A for the process connection.

Q: Can the TU842 operate across the full specified storage temperature range?
A: No. The operating range is 0 to +55 deg C, while the storage range is -40 to +70 deg C. The two ranges apply to different operating conditions.

Field Installation Guidelines

1. Mount the TU842 horizontally and secure it according to the mechanical requirements of the associated S800 I/O installation.
2. Verify the terminal-block identification before connecting field conductors.
3. Keep each I/O channel within the specified 3 A maximum current.
4. Keep the process connection within the specified 10 A maximum current.
5. Route field wiring separately from high-voltage or high-noise conductors where the installation requires signal separation.
6. Connect cable shields according to the system grounding design and applicable site electrical standards.
7. Check terminal tightness and conductor seating before applying power.
8. Confirm that the ambient operating temperature remains within 0 to +55 deg C.
9. Do not treat the -40 to +70 deg C storage range as an operating temperature range.
10. Verify the associated redundant I/O configuration before commissioning the termination assembly.

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