Description

ABB TU838 3BSE008572R1 Extended Module Termination Unit

Configured for direct field termination and process connection distribution, the ABB TU838 3BSE008572R1 (TU838 Extended Module Termination Unit) provides physical I/O termination for ABB automation systems. It supports 16 channels, 50 V rated voltage, and up to 3 A per I/O channel. The unit uses terminal block connections and supports mounting in both directions.

Hardware Specifications

Parameter	Specification
Model	TU838 3BSE008572R1
Brand	ABB
Product Type	Extended Module Termination Unit
Type	Extended
Origin	Sweden
Weight	0.3 kg
Dimensions	Estimated shipping size: 12.7 x 7.6 x 12.7 cm
Operating Temp	0 to +55 deg C; approvals issued for +5 to +55 deg C
Storage Temp	-40 to +70 deg C
Relative Humidity	5 to 95 %, non-condensing
Connection	Terminal block
Rated Voltage	50 V
I/O Channels	16
Mounting	Both directions
I/O Configuration	Single I/O
Maximum Current per I/O Channel	3 A
Maximum Current at Process Connection	10 A
Dielectric Test Voltage	500 V AC
Marine Certification	ABS, BV, DNV-GL, LR

ABB I/O Termination and Channel Density

The TU838 provides 16 physical I/O channels through terminal block connections. Therefore, the unit accommodates a relatively high number of field connections within its extended termination configuration. Each I/O channel permits a maximum current of 3 A, while the process connection has a maximum current rating of 10 A.

The 50 V rating defines the stated process-side voltage limit. In addition, the 500 V AC dielectric test voltage specifies the supplied insulation test level. The single I/O configuration does not indicate a redundant termination arrangement in the supplied specifications.

The unit supports mounting in both directions, which allows the installer to select the orientation appropriate to the cabinet or mounting arrangement. Marine approvals include ABS, BV, DNV-GL, and LR.

Frequently Asked Questions

Q: How many I/O channels does the ABB TU838 provide?

A: The TU838 provides 16 I/O channels through terminal block connections.

Q: What current can each I/O channel handle?

A: Each I/O channel has a maximum specified current of 3 A. The maximum current at the process connection is 10 A.

Q: What environmental temperature range does the TU838 support?

A: The specified operating range is 0 to +55 deg C. Storage temperature ranges from -40 to +70 deg C. Approval conditions are specified for +5 to +55 deg C.

Field Installation Guidelines

Install the TU838 in the specified cabinet or mounting location with adequate mechanical support. Verify terminal identification before connecting field wiring, and keep signal wiring separated from high-voltage or high-current conductors where applicable.

Use wiring and protective devices suitable for the connected load and the stated 50 V rating. Do not exceed the 3 A maximum current per I/O channel or the 10 A process connection limit.

Maintain appropriate separation between signal conductors and power conductors to reduce electromagnetic interference. Where shielded cables are used, terminate shields according to the system grounding design and avoid unintended ground loops.

Before energization, inspect terminal tightness, conductor routing, polarity, and insulation condition. Confirm that the installed temperature and humidity conditions remain within the specified operating limits.

Specifications

• Brand: ABB

Advantages

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