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ABB TU841 Termination Unit for 1+1 TB840

Configured for redundant TB840/TB840A termination and ModuleBus distribution, the ABB TU841 3BSE020848R1 (TU841 Termination Unit) provides the physical interface for single I/O and single power configurations. It accepts 24 VDC input and supports ModuleBus line redundancy. The unit supports vertical or horizontal mounting and uses mechanical keys for configuration control.

Hardware Specifications

Parameter	Specification
Model	TU841
Spare Model	3BSE020848R1
Article Number	3BSE020848R11
Brand	ABB
Product Type	Termination Unit for 1+1 TB840
Configuration	Redundant TB840/TB840A, Single I/O, Single Power
Communication Protocol	ModuleBus
Master or Slave	N/A
Line Redundancy	Yes
Hot Swap	No
Power Input	24 VDC, 19.2 to 30 V
ModuleBus Current Distribution	Maximum 5 V, 1.5 A; 24 V, 1.5 A
Power Consumption	2.0 W power dissipation
Mounting	Vertical or Horizontal
Mechanical Keys	36 different combinations
Acceptable Wire Size	Solid: 0.2 to 2.5 mm2; Stranded: 0.2 to 2.5 mm2, 24 to 12 AWG
Recommended Torque	0.5 Nm
Rated Insulation Voltage	50 V
Dielectric Test Voltage	500 VAC
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
Maximum Ambient Temperature	55 deg C; 40 deg C for vertical mounting
Ingress Protection	IP20 according to IEC 60529
Equipment Class	Class I according to IEC 60536, earth protected
CE Marking	Yes
Electrical Safety	EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
Hazardous Location	cULus Hazardous Location Class 1 Zone 2, ATEX Zone 2
Marine Certificates	ABS, BV, DNV-GL, LR
RoHS Compliance	EU RoHS, UAE RoHS, CN RoHS
WEEE Compliance	Directive 2012/19/EU
Dimensions	124 x 186 x 47 mm
Height	186 mm including latch
Estimated Shipping Size	185 x 123 x 45 mm
Weight	0.45 kg

ABB ModuleBus and I/O Interface Characteristics

The TU841 distributes ModuleBus power and provides the termination interface for redundant TB840/TB840A configurations. Line redundancy supports the specified redundant ModuleBus arrangement, while the unit itself does not support hot swapping.

The 24 VDC input accepts 19.2 to 30 V. ModuleBus current distribution is rated up to 1.5 A on the 5 V supply and 1.5 A on the 24 V supply.

Furthermore, the TU841 provides 36 mechanical key combinations. These keys support physical configuration control and help prevent incompatible module placement.

The unit supports both vertical and horizontal installation. However, the maximum ambient temperature is reduced to 40 deg C for vertical mounting according to the supplied data.

Frequently Asked Questions (FAQ)

Q: Does the ABB TU841 support hot swapping?
A: No. The supplied specifications identify Hot Swap as "No". Installation and replacement should therefore follow the applicable system shutdown and isolation procedure.

Q: What ModuleBus current can the TU841 distribute?
A: The specified maximum distribution is 1.5 A at 5 V and 1.5 A at 24 V.

Q: Can the TU841 operate with redundant TB840/TB840A configurations?
A: Yes. The specified configuration is redundant TB840/TB840A with single I/O and single power, and the unit supports ModuleBus line redundancy.

Field Installation Guidelines

• Verify the TU841 model and article number before installation.
• Confirm that the supply voltage remains within 19.2 to 30 VDC.
• Mount the unit vertically or horizontally according to the cabinet design and applicable temperature limits.
• Maintain the specified wire range of 0.2 to 2.5 mm2 for field wiring.
• Apply the recommended 0.5 Nm terminal torque where applicable.
• Use the mechanical key configuration specified for the intended module arrangement.
• Connect protective earth according to the cabinet grounding design and applicable electrical standards.
• Separate power and signal wiring where required by the installation design to reduce electrical interference.
• Do not perform hot-swapping because the supplied specification does not support this function.
• Verify ModuleBus connections and redundant line routing before energizing the assembly.
• Maintain the IP20 enclosure requirements by installing the TU841 inside an appropriate protected cabinet or enclosure.

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