4 Pole RCCB, in addition to normal AC, can detect high frequency AC and pure DC earth leakage currents. Reducing the risk of fire and/or electrocution through automatic disconnection of the electrical supply relies on the selection of the correct type of RCCB.
4 Pole RCCB Applications requiring ‘B’ types include
EV & PV installations
High-frequency power converters
Building site power supply cabinets