ABB 3BSE013235R1 TU831V1 MTU 8 Ch 250V

ABB 3BSE013235R1 TU831V1: Extended MTU for High-Power Field Signals

The ABB 3BSE013235R1 belongs to the TU831V1 series of extended Module Termination Units. This MTU handles up to 8 I/O channels with a maximum rated voltage of 250 V. Furthermore, each channel supports a maximum rated current of 3 A. The TU831V1 distributes the ModuleBus to the connected I/O module and forwards it to the next MTU in line. Additionally, it generates the correct address by shifting outgoing position signals to the next unit. You can mount this MTU on a standard DIN rail, and its mechanical latch locks it securely in place.

Greater Connection Area for Larger Wires

One standout feature of the 3BSE013235R1 is its greater connection area for larger wires. Acceptable wire sizes include solid 0.2–6 mm² or stranded 0.2–4 mm², which corresponds to 24–10 AWG. This capacity makes the TU831V1 ideal for applications requiring thicker gauge field wiring. Recommended torque remains at 0.5–0.6 Nm with a stripping length of 7 mm. The dielectric test voltage reaches 2000 V a.c., ensuring robust isolation.

Technical Specifications of the 3BSE013235R1 TU831V1

The ABB TU831V1 provides up to 8 isolated channels of field signals. Process connections total 16, with 2 terminals allocated per channel. The article number is 3BSE013235R1, and the type is Extended. Connection uses a terminal block interface. Rated voltage sits at 250 V, while maximum current per I/O channel is 3 A. This MTU works specifically with I/O modules DI820, DI821, DO820, and DO821. It supports only single I/O configurations, not redundant setups. The extended design offers more wiring space compared to compact alternatives.

Mechanical Dimensions and Mounting Flexibility

The 3BSE013235R1 measures 126 mm in width including the connector, or 120.5 mm edge to edge when installed. Depth reaches 64 mm including terminals, and height is 110 mm. Weight is only 0.22 kg (0.48 lbs). Mounting is possible in both directions, giving you flexible installation options. The maximum ambient temperature is 55 °C (131 °F). Therefore, this MTU suits a wide range of industrial control cabinets.

Environmental Certifications and Compliance

The ABB TU831V1 carries a CE mark and meets multiple electrical safety standards: EN 61010-1, UL 61010-1, EN 61010-2-201, and UL 61010-2-201. It does not carry hazardous location certifications. Marine approvals include ABS, BV, DNV-GL, and LR. Operating temperature ranges from 0 to +55 °C (+32 to +131 °F), though approvals are issued for +5 to +55 °C. Storage temperature spans -40 to +70 °C (-40 to +158 °F).

Pollution degree is 2 according to IEC 60664-1. Corrosion protection meets ISA-S71.04: G3 standards. Relative humidity operates between 5 and 95% non-condensing. Protection class is IP20 per IEC 60529. Mechanical conditions comply with IEC/EN 61131-2. EMC follows EN 61000-6-4 and EN 61000-6-2. Overvoltage categories align with IEC/EN 60664-1 and EN 50178. Equipment class is Class I (earth protected) per IEC 61140. Finally, RoHS compliance follows EN 50581:2012, and WEEE compliance adheres to DIRECTIVE/2012/19/EU.

Installation Guide for the ABB TU831V1 MTU

First, mount the 3BSE013235R1 onto a standard DIN rail. The mechanical latch will lock the unit firmly to the rail. For grounding, the latching device provides an earth connection through the DIN rail. Next, connect the ModuleBus from the previous MTU or controller. The ABB TU831V1 distributes this bus to the I/O module and passes it downstream.

For wiring, strip each conductor to 7 mm and tighten terminals to 0.5–0.6 Nm. Because the TU831V1 accepts up to 10 AWG stranded wire, you can use thicker cables for longer runs or higher current loads. Then, set the mechanical keys according to your specific I/O module (DI820, DI821, DO820, or DO821). This keying prevents insertion of the wrong module type. Finally, attach the I/O module and verify addressing. The 3BSE013235R1 automatically shifts position signals to generate unique addresses for downstream MTUs.

Frequently Asked Questions (FAQ)

1. Can the ABB 3BSE013235R1 be used with DO820 in redundant configurations?
No, the TU831V1 is designed exclusively for single I/O configurations. For redundant setups, please consult ABB's S800 I/O redundant system documentation.

2. What is the maximum wire size the TU831V1 accepts for stranded conductors?
The ABB TU831V1 accepts stranded wire up to 4 mm², which corresponds to 10 AWG. This makes it suitable for longer cable runs or higher current applications.

3. How does the 3BSE013235R1 differ from the TU836V1?
Both are extended MTUs with 8 channels at 250V and 3A. However, the TU831V1 supports larger wires (10 AWG vs 12 AWG) and works with DI820/DI821/DO820/DO821, while the TU836V1 works with DO820/DO821 only.

4. Is the ABB TU831V1 approved for marine environments?
Yes, the 3BSE013235R1 holds marine certifications from ABS, BV, DNV-GL, and LR. Therefore, it is suitable for shipboard and offshore applications.

5. What stripping length is required for wiring the TU831V1?
The ABB 3BSE013235R1 requires a stripping length of exactly 7 mm. Using the correct length ensures proper insertion and reliable clamping within the terminal block.