ABB TU837/TU837V1 Compact MTU (3BSE013238R1)

Description

The TU837/TU837V1 is an 8-channel, 250V Extended Module Termination Unit (MTU) designed for the ABB S800 I/O system. It is a passive unit that connects field wiring to I/O modules and integrates with the ModuleBus for data and signal distribution. The MTU distributes the ModuleBus to the I/O modules and subsequent MTUs, while also generating the correct address for each I/O module.

The unit can handle up to 8 I/O channels, with a maximum rated voltage of 250V and a current of 3A per channel. Additionally, the MTU is equipped with a mechanical locking mechanism and a mechanical keying system for proper module configuration. The process signal terminals are divided into two isolated groups, with each group containing fused load terminals and signal return connections.

The TU837 can be mounted on a standard DIN rail with the included mechanical latch that secures the MTU in place. This latch can be released using a screwdriver for easy module replacement or maintenance.

Features

250 Volt Applications: Designed for use with DO820 and DO821 I/O modules.
8 I/O Channels: Provides up to 8 isolated channels for field signals.
Fused Load Power Terminals: Each channel includes a fused load outlet terminal and a signal return terminal.
Dual Power Common Terminals: Includes 2 x 6 power common terminals for process power connections.
Mechanical Keying: Prevents incorrect I/O module insertion with 36 different configuration options.
Process Signal Isolation: Two groups of isolated I/O channels for signal return.
Mechanical Locking Mechanism: Secures the I/O module in place and maintains its initialization state until locked.

Technical Data

Item	Value
Process Connections	28 (up to 8 I/O channels, 2 terminals per channel)
Power Common Terminals	2 x 6 terminals for process power
Maximum Current per I/O Channel	3 A
Maximum Current for Process Connection	10 A
Wire Sizes (Signal Connections)	Solid: 0.2 – 6mm², Stranded: 0.2 – 4mm² (24 – 10 AWG)
Wire Sizes (Return Connections)	Solid: 0.2 – 4mm², Stranded: 0.2 – 2.5mm² (24 – 12 AWG)
Recommended Torque	0.5 – 0.6 Nm
Stripping Length (Signal)	8 mm
Stripping Length (Return)	7 mm
Dielectric Test Voltage	2000 V a.c.
Mechanical Keys	36 different combinations
I/O Module Lock	Yes, locks module in place
Protection Rating	IP20 (IEC 60529)
Rated Insulation Voltage	250 V
Dielectric Test Voltage	2000 V a.c.
Width	126 mm (5”) including connector, 120.5 mm (4.74”) edge to edge installed
Depth	64 mm (2.52”) including terminals
Height	110 mm (4.3”)
Weight	0.26 kg (0.57 lbs)

Environmental and Certification Data

CE Mark: Yes
Electrical Safety: EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
Marine Certification: ABS, BV, DNV-GL, LR
Operating Temperature: 0 to +55 °C (+32 to +131 °F), approvals issued for +5 to +55 °C
Storage Temperature: -40 to +70 °C (-40 to +158 °F)
Pollution Degree: Degree 2 (IEC 60664-1)
Corrosion Protection: ISA-S71.04: G3
Relative Humidity: 5 to 95%, non-condensing
Protection Class: IP20 (IEC 60529)
EMC Compliance: EN 61000-6-4, EN 61000-6-2
Overvoltage Categories: IEC/EN 60664-1, EN 50178
Equipment Class: Class I (earth protected)
RoHS Compliance: EN 50581:2012
WEEE Compliance: DIRECTIVE/2012/19/EU

Mounting and Installation

Mounting: Compatible with standard DIN rails (both horizontal and vertical installations are supported).
Mechanical Locking: The MTU includes a mechanical latch that locks it securely to the DIN rail, ensuring grounding and stability.