what is the expected maximum temperature rise within the terminals of Tesys D contactors?
All contactors are designed with respect to IEC 60947 (Low-voltage switchgears and controlgears - Contactors and Motor Starters) standard. This standard defines maximum permitted temperature rise depending on the contactor part. Please refer to the attached extract from IEC 60947.
Temperature rise means difference in temperature between the product part (e.g. terminals) and ambient temperature.
For example maximum thermal rise for copper is 60 K (see extract), which means if ambient temperature is 30°C, then maximum temperature of copper terminal can be 30 + 60 = 90°C. If ambient temperature is 40 degrees, temperature measured on copper terminal can be up to 100°C. (attached is the relevant page)