Overvoltage Protection - Siemens SINAMICS S120 Combi Equipment Manual

Line-side power components

3.5 Overvoltage protection

Derating characteristics
Figure 3-3
3.5 Overvoltage protection
To protect the units against line-side surge voltages, install an overvoltage protection device
(surge arrester) directly at the infeed point. For use in Canada, to comply with the
requirements of CSA C22.2 No. 274, a UL category VZCA7 or VZCA8 surge arrester is
absolutely mandatory. The Raycap company has suitable surge arresters.
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The rated current and tripping current depend on the ambient temperature for rated
residual currents over 100 mA
SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5