Type -A:
Protects against special forms of residual pulsating DC which have not been smoothed.
Type -S:
Selective residual current device sensitive to AC, type -S. Compulsory for systems with surge arresters downstream of the RCD.
Type -G:
High reliability against unwanted tripping. Compulsory for any circuit where personal injury or damage to property may occur in case of unwanted tripping.
Type -G/A:
Additionally protects against special forms of residual pulsating DC which have not been smoothed. Special types for X-ray application PFIM-...-R.
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