ABB TU840（3BSE020846R1 ）Termination Unit

ABB TU840（3BSE020846R1 ）Termination Unit

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The insulation test voltage in the datasheet as mentioned in Figure 38 is measured before and after reliability tests of the power module and is furthermore part of failure criteria of such stress tests. 

The insulation voltage of the NTC inside the IGBT fulfills a functional isolation requirement only. In case of failures, for example of the gate driving circuit, a conducting path can be formed by moving bond wires that change their position during the failure event or by a plasma path forming as a consequence of arcing during failure. 

Therefore, if insulation requirements higher than a functional insulation have to be achieved, additional insulating barriers have to be added externally. The torque for the mechanical mounting of the module is specified in the datasheet as noted in Figure 42. These values are important to ensure the proper clamping force of the module to the heat sink. For modules with screwable power terminals, an additional mounting torque for terminal connection is given in the datasheet to ensure a reliable mechanical and electrical connection of bus-bars. 

ABB TU840（3BSE020846R1 ） Technical drawing:

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