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What type of RCD is recommended to be used with frequency converters?

Use a Type A Residual Current Device (RCD / GFCI) or a Residual Current Monitor (RCM) for single phase drives connected to a phase and to the neutral conductor.

Use a Type B Residual Current Device (RCD / GFCI) or a Residual Current Monitor (RCM) that has approval for use with frequency converters and is sensitive to all types of current for three-phase devices and for single-phase devices not connected to a phase and the neutral conductor.

Further conditions for use of a residual current device:
  • The drive has an increased leakage current at the moment power is applied. Use a residual current device (RCD / GFCI) or a residual current monitor (RCM) with a response delay.
  • High-frequency currents must be filtered.
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