Protection against shock and fire hazards during EV charging requires detection of AC and DC residual fault currents. This can be achieved by the use of dedicated RCDs, or by a combination of DC and/or AC residual current monitors with an A Type RCD or some other switching device. The following are the relevant IEC product standards covering protective devices for use in Mode 2, Mode 3 and Mode 4 EV charging.
The Type B RCD and the EV RCD are two stand alone devices that have the ability to detect AC and DC residual fault currents in Mode 3 charging applications and therefore the EV installation does not require additional monitoring for fault currents.
The Type EV RCCB has been developed specifically for EV charging systems and can detect AC and DC residual currents in accordance with the requirements of IEC62955. This provides a lower cost option to the Type B RCD, and has been designed specifically for use in Mode 3 and Mode 4 EV charging applications.