Is RCD Type B Better Than RCD Type A + RDC-DD at EV Charging?

Both RCD Type-B and a combination of RCD type A and RDC-DD provide sufficient protection at EV AC charging.

IEC61851-1: 2017 and IEC60364-7-222:2018 specify the protective measures against the residual current for Mode-3 EV AC charging systems as following

Option 1: RCD Type B complying with IEC62423 or IEC60947-2

Option 2: RCD Type A complying with IEC61008-1, IEC61009-1, or IEC60947-2 and RDC-DD complying with IEC62955

People might ask what the difference between the two protective measures is.

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Shanghai, China

Shanghai Bituo Electric Co., Ltd.

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