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This Acti 9 iMSU electrical auxiliary is an overvoltage release. It is dedicated to iC60, iID, iID40, iDPN Vigi, iSW-NA, iC40, iCV40, iC40 XA, iCV40 XA, iCV40 XA, iC60 & iID double terminals, iC60 RCBO, iKQE RCBO. It provides a protection of equipment against overvoltages on the electrical network (neutral conductor break) and voltage monitoring between phase and neutral conductors.