ABB 1SDA038344R1 SACE Emax/E1/E6/Tmax Series T8 Circuit Breakers

ABB 1SDA038344R1 SACE Emax/E1/E6/Tmax Series T8 Circuit Breakers

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The maximum junction temperature Tvj,max is the maximum allowed value for the specific device to be reached during the temperature cycles shown in the power-cycling diagram. The higher the maximum junction temperature Tvj,max, the higher is the stress on the device, which results in a reduced number of cycles. 

The turn-on time ton is the period during which power losses are generated in the device, resulting in a steady temperature rise of Tvj e.g. during the acceleration phase of a motor drive. The longer the turn-on period, the higher the temperature rise and the corresponding stress to the device, which results in a reduced number of cycles during lifetime. This can be explained by the viscoplastic deformation energy in the material layers that undergo thermomechanical cycling for longer turn-on periods. For instance, for industrial power modules, a typical ton time for the short cycle PCsec test is 1.5 s. 

ABB 1SDA038344R1 Technical drawing:

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