Danfoss VLT Series Design Manual page 123

VLT ® HVAC Drive Design Guide 5. How to Install
If a ground fault appears, a DC content may develop in the faulty current.
If RCD relays are used, you must observe local regulations. Relays must be suitable for protection
of 3-phase equipment with a bridge rectifier and for a brief discharge on power-up see section
Ground Leakage Current for further information.
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MG.11.B4.22 - VLT ® is a registered Danfoss trademark.