RCCBs type A high immunity (HI)

RCCBs type A high immunity grant protection in presence of faults current of both sinusoidal alternate and pulsating type. They are therefore recommended to protect installations where the connectable electric devices have electronic rectifiers or electronic circuits regulating the current wave; furthermore they are designed with an electronic circuit which can discriminate between temporary leakage caused by disturbances on the main and permanent leakage due to proper faults. These devices provide the residual current protection already granted by a standard RCCB, and additionally their installation prevents eventual unwanted tripping in all those cases where service continuity is a must.
RCCBs are suitable to detect earth faults’ currents. In case the installation requires also protection from eventual overload and short-circuits, the RCCBs must be installed in series with MCBs or with fuses.
RCCBs’ functioning is independent from line voltage and the mechanism is trip-free, meaning that RCCBs can also trip when the lever is held on close position. All products can be power supplied from both the top and the bottom terminals. Furthermore “cage” type terminals facilitate connection both through conductors (up to 35mm² rigid and 25mm² flexible) and through busbars (both pin or fork types).