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The ABB TU842 (3BSE020850R1) is a redundant, horizontal Module Termination Unit (MTU) designed for the S800 I/O system. It provides a robust interface for connecting field signals to I/O modules while facilitating the distribution of the ModuleBus and process power.
| Model | TU842 / 3BSE020850R1 |
| Channels | 16 |
| Max Voltage | 50 V |
| Max Current (per channel) | 3 A |
| Max Current (process connection) | 10 A |
| Dielectric Test Voltage | 500 V AC |
| Operating Temperature | 0 to +55 degC |
| Storage Temperature | -40 to +70 degC |
| Mounting | Horizontal, DIN Rail |
It is a redundant, horizontal Module Termination Unit (MTU) designed for the ABB S800 I/O system, used for connecting field signals to I/O modules and distributing the ModuleBus.
The unit supports up to 16 I/O channels, with each channel featuring two I/O connections and one ZP connection.
The MTU uses four mechanical keys (two for each I/O module) with six positions each, allowing for 36 different mechanical configurations to prevent incorrect module insertion.