RCMP20-03 Series Current Monitoring Module

Littelfuse's RCMP20-03 series is an AC/DC sensitive residual current monitoring module that monitors ground fault, residual, or leakage currents in single- or multiple-phase installations. The series is suitable for integration into in-cable control and protection devices, according to IEC 62752. Fault currents in AC and DC may occur in EV charging stations. Common Type A residual current devices (RCDs) do not detect DC currents, and this type of fault current can blind the protection device, exposing the user to the possibility of electrical shock. It is required to install the RCMP20-03 series as an AC/DC fault sensor in Mode 2 charging stations to work in combination with a Type A RCD.

The RCMP20-01 series is a residual direct current monitoring module (RDC-M module) that monitors ground fault, residual, or leakage currents in single- or multiple-phase installations. The RCMP20-01 series is suitable for integration into Mode 3 electric vehicle charging, according to IEC 62955. Fault currents in AC and DC may occur in EV charging stations. Common Type A RCDs do not detect DC currents, and this type of fault current can blind the protection device, exposing the user to the possibility of electrical shock. It is required to install the RCMP20-01 series as a DC fault sensor in Mode 3 charging stations to work in combination with a Type A RCD.

Mode 2

A portable in-cable control and protection device (IC-CPD) is used for Mode 2 electric vehicle charging. The RCMP20-03 series simultaneously performs the functions of AC/DC residual current detection and opening the protected circuit when the residual current exceeds the specified value, according to IEC 62752. The Mode 2 charging station standard (IEC 62752) requires both AC and DC fault current detection to guard against inadequate protection at the supply IC-ICP connection (i.e., Type A RCD).

Mode 3

Permanently connected AC electric vehicle charging stations are considered Mode 3 charging, according to IEC 61851-1 and IEC 60364-7-722. The RCMP20-01 series monitors the residual direct current that Type A RCD protection does not detect.

Function

The RCMP20-03 series continuously monitors AC and DC residual currents. When failure current exceeds the threshold values, the device sends a tripping signal. When coupled with an appropriate switching device, the module will meet the requirements of an IEC62752 IC-CPD.