In household a properly designed electrical diagram should also include overvoltage protection. This overvoltage protection saves complete household against over voltage, which comes from the grid, when thunderstorm or something similar is in the nearby and causes voltage peaks. This household (external) overvoltage cuts the peak in more levels ( Class I, Class II, Class III) of the overvoltage and ensures that voltage in household grid stays in normal value. This overvoltage protection must be installed on all phases. See some instructions about that topic on site:
httphttps://www.tsipower.com/sites/default/uploadsfiles/white-papers/WP-IEC-61312-Surge-Protective-Device-Coordination-2012-06-14.pdf
Residual current protection and over current protection do not protect your household against over voltage.
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