Type A RCDs only detect AC residual currents, and need to be used with a DC residual current detector for EV charging.
The DC monitor will detect an unsafe DC residual current and cause activation of a device to disconnect the supply to the EV. The disconnecting device may be an RCD, a circuit breaker or a contactor.
The Residual Current Monitor (RCM) range is intended for the detection of DC and/or AC residual currents in AC or DC installations. These RCMs are ideally suited for use with Electric Vehicle charging cables (Mode 2 Protection) and EV charging stations (Mode 3 Protection). Residual current detection options for IEC based requirements are 30mA AC or 6mA DC or both, and are 20mA AC & 6mA DC for UL requirements.
IEC 62752 In-cable control and protection device for mode 2 charging of electric road vehicles (IC-CPD).
IEC 62955 Residual Direct Current Monitoring Device to be used for Mode 3 charging of Electric Vehicle.
The Residual Current Monitor (RCM) module is connected in series with the AC supply to an EV and will provide an output if a DC current ≥ 6mA DC flows in the circuit. This output can be used to operate an RCD, a circuit breaker or a contactor to remove the supply to the EV.
Residual Current Monitior Advantages
The RCM20 provides all of the features of the RCM14, but has a 20mm aperture which can accommodate larger conductors.
The RCM01 range of residual current monitors is intended for the detection of DC and/or AC residual currents in 50Hz/60Hz AC or DC installations (see model options below).
(Mode 2) & UL2231