ABB TU831/TU831V1 Compact MTU (3BSE036714R1)

Description

The TU831/TU831V1 is an 8-channel, 250V extended Module Termination Unit (MTU) designed for ABB’s S800 I/O system. It acts as a passive unit, connecting field wiring to I/O modules while also carrying part of the ModuleBus. This MTU can handle up to 8 I/O channels, with a maximum rated voltage of 250V and a maximum current of 3A per channel. It also manages the distribution of the ModuleBus to the I/O module and the next MTU, and configures the address for the I/O module.

The MTU uses mechanical keys for configuring I/O modules and features an easy-to-release mechanical latch for securing to a DIN rail. The configuration is done mechanically via keys that ensure compatibility with different I/O modules. This system allows up to 36 possible configurations.

Features

250V Applications: Compatible with DI820, DI821, DO820, and DO821 I/O modules.
Greater Connection Area: Supports larger wire sizes.
8 Isolated Channels: Provides 8 isolated I/O channels with two terminals per channel.
ModuleBus Distribution: Distributes power and signals between I/O modules.
Mechanical Keying: Prevents incorrect I/O module insertion.
DIN Rail Mounting: Secure attachment and grounding with a mechanical latch.
I/O Module Lock: Locks modules into position, ensuring correct initialization.

Technical Data

Item	Value
Process Connections	16 (2 terminals per channel)
Max Current per I/O Channel	3 A
ModuleBus Distribution (5V)	1.5 A
ModuleBus Distribution (24V)	1.5 A
Wire Sizes	Solid: 0.2 – 6mm², Stranded: 0.2 – 4mm², 24 – 10 AWG
Recommended Torque	0.5 – 0.6 Nm
Stripping Length	7 mm
Mechanical Keys	36 different combinations
I/O Module Lock	Yes, locks the module in place
Equipment Class	Class I (earth protected)
Protection Rating	IP20 (IEC 60529)
Rated Insulation Voltage	250 V
Dielectric Test Voltage	2000 V a.c.
Dimensions	Width: 126 mm, Depth: 64 mm, Height: 110 mm
Weight	0.22 kg

Differences Between TU831 and TU831V1

Both the TU831 and TU831V1 are expansion module termination units (MTUs) in the ABB S800 series, designed to connect I/O modules and provide signal connections and power distribution. While the two products are very similar in functionality, there are some subtle differences between them.

Key Differences:

1. Version Difference

TU831V1 can be considered an upgraded version of TU831. In the TU831V1, ABB likely made optimizations or improvements in performance, compatibility, or features. These improvements might be related to component reliability, efficiency, or ease of integration with other devices in the system.

2. Hardware Differences

While both models appear similar in terms of external design and functionality, there might be differences in the internal hardware, such as the components used, the circuit board layout, or other design aspects. These differences could potentially affect performance or behavior in specific applications.

3. Software Support

Due to the version change, TU831V1 may receive longer and more extended technical support and software updates. ABB typically provides firmware updates and software support for newer versions, meaning TU831V1 is likely to have longer support availability compared to the older TU831.

Common Features:

Expansion Module Termination Unit: Both models serve as termination units for expanding I/O modules, offering signal connections and power distribution.
8×2 Terminals: Both models feature 8 groups of double terminals for connecting I/O modules.
Rated Voltage: Both units have a rated voltage of 250V.
Applications: They are primarily used for connecting 120/230 V AC/DC binary modules, providing field power distribution.

How to Choose:

Project Requirements: If your project requires higher performance, enhanced compatibility, or specific functional improvements, the TU831V1 would be a better choice.
Existing Systems: If your system is already using TU831, you may prefer to stick with the same model for consistency and compatibility.
ABB Recommendations: It’s best to consult ABB’s technical support for personalized advice based on your specific needs.

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