ABB TU837V1 Module Termination Unit

Description

ABB TU837V1 Module Termination Unit

Product Overview

The ABB TU837V1 (Article Number: 3BSE013238R1) is an extended Module Termination Unit (MTU) designed for the ABB System 800xA S800 I/O system. It acts as the physical and electrical base interface for up to 8 high-voltage relay/digital output I/O modules, primarily the DO820 and DO821.

The TU837V1 routes the internal ModuleBus signals, generates automatic I/O module addressing, provides individual fused isolation per channel, and features a 28-terminal block interface for field signal connections.

Technical Specifications

• Return: Solid 0.2–4 mm² / Stranded 0.2–2.5 mm² (24–12 AWG) | | Terminal Torque & Strip Length | 0.5–0.6 Nm; 7–8 mm strip length | | Mechanical Keying | 2 mechanical key positions (36 configuration combinations) | | IP Protection / Environment | IP20 (IEC 60529); Pollution Degree 2; ISA-S71.04 G3 corrosion protection | | Operating Temperature | 0 °C to +55 °C (32 °F to 131 °F) | | Dimensions & Weight | 120.5 mm (W) × 110 mm (H) × 64 mm (D); Approx. 0.26 kg (0.57 lbs) |

Key Advantages

• Individual Channel Fusing: Each of the 8 output channels includes a dedicated fuse, isolating faults to single channels without interrupting power to neighboring outputs.
• High Electrical Isolation: Rated for up to 250 V AC/DC and tested to 2000 V AC dielectric strength, rendering it suitable for driving heavy AC relay contacts or switching high-voltage plant devices.
• Automatic Module Bus Addressing: Automatically shifts outgoing position signals to generate the correct bus address for the next MTU along the DIN rail.
• Mechanical Keying Security: Includes dual 6-position mechanical keying dials to prevent maintenance personnel from accidentally plugging an incorrect I/O module type into the termination unit.
• DIN Rail Grounding & Latching: Features a tool-released mechanical latch that locks the unit securely to standard 35 mm DIN rails while establishing chassis ground connections.

Important Usage & Installation Precautions

• Fuse Replacement Verification: Always check and replace blown fuses with correctly rated, fast-acting fuses compatible with your downstream field load before re-energizing the channel.
• Current and Thermal Limits: Do not exceed the 3 A per channel rating or the overall 10 A total MTU process connection limit to prevent overheating of the terminal tracks.
• Cabinet Environment: Rated to IP20. It must be housed inside an IP54-rated or higher enclosure when deployed in harsh, dusty, or high-moisture industrial settings.
• Mechanical Key Alignment: Set the two key dials to the exact positions designated for the DO820/DO821 module before inserting the module for the first time.
• Safe Wiring Practices: De-energize both field process power and the ModuleBus power supply prior to installing, removing, or re-wiring field connections on the terminal blocks.

Product Applications

• Process Automation Systems (DCS): Installed in S800 I/O switchgear cabinets for ABB System 800xA, Compact HMI, or Freelance control architectures.
• Heavy Relay Signal Isolation: Used to interface control system digital outputs directly with high-voltage field actuators, solenoid valves, and motor starter coils operating at up to 250 V.
• Power Plants & Substations: Ideal for switching 110 V / 220 V DC trip signals, alarms, and breaker status indicators requiring fused isolation.
• Critical Process Control: Deployed in chemical, petrochemical, oil & gas, and water treatment automation where single-channel short circuits must not compromise the entire I/O card.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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