What protective measures on the affected sub-circuits - MCBs and fuses probably won't operate on a lost neutral, even if the phase to flying neutral voltage goes up to 300+. You may have more joy with an RCD, but even then if the fault comes on gently, as far as the RCD is concerned , L and N current are still in balance.
The only sure fire safety mechanism would be shunt trip whose actuating coil is operated by an over-voltage detector wired L-N.
What protective measures on the affected sub-circuits - MCBs and fuses probably won't operate on a lost neutral, even if the phase to flying neutral voltage goes up to 300+. You may have more joy with an RCD, but even then if the fault comes on gently, as far as the RCD is concerned , L and N current are still in balance.
The only sure fire safety mechanism would be shunt trip whose actuating coil is operated by an over-voltage detector wired L-N.
