Protective device for pump motors on a fire sprinkler systems

Dear all we seem to have gone off topic; The question -

Is there a reason fuse switches are proposed within the main LV switchboard for sprinkler pump supplies, when all other services in the LV SWB use MCCBs, is the specification of a F/S due to a BSEN or IEC standard, if not, why can I not use an MCCB instead of a Fuse switch? 

Dear all we seem to have gone off topic; The question -

Is there a reason fuse switches are proposed within the main LV switchboard for sprinkler pump supplies, when all other services in the LV SWB use MCCBs, is the specification of a F/S due to a BSEN or IEC standard, if not, why can I not use an MCCB instead of a Fuse switch? 

I think the topic drifted because you introduced the possibility of monitoring a MCCB using equipment which may not have sufficient integrity to perform that monitoring function.

For me, a good starting point would be: "Does the MCCB manufacturer have a view on their use in circumstances where mal-operation leading to interruption of supply may result in loss of life?".

Fuse reliability (assuming that you buy them from a reputable source) is generally just whatever it is and the designer can pluck a figure out of a standard.  The reliability of more complex assemblies is harder to determine and published figures can sometimes be wide of the mark.

Do you have the necessary reliability data for fuses / MCCBs to be able to demonstrate that using a MCCB was a sensible decision, especially if fuses have been used traditionally?

In response to the question "is the specification of a F/S due to a BSEN or IEC standard" - The answer is yes it is likely due to a standard.  Which standard may apply would depend.  As an e.g. refer to BS 8519.  LPC Rules also include a requirement and may also apply .