"It is not manufactured as an assembly to BS EN 61439-3 as it is not a consumer unit "



Interesting - I thought most would have considered a switchfuse as coming under the heading of 'similar swicthgear' - being pretty much identical in function to a 1-way CU (DP incomer, feeding one OPD, suitable for use at the origin of an installation and so on).

Like a shark AJ ?


It , the KMF, is not manufactured as an assembly to BS EN61439-3, as it is not a consumer unit.


However, if there is only a KMF and no consumer unit- unlikely- then the intended use changes and would not be in the spirit of 421 etc.


There are no steel moulded 800KMFs; though there briefly was, though to what BS is lost in time.


Some may chose to manufacture a switch fuse to 61439-3, as opposed to the specific KMF.


In the KMF, you cannot change the fuse holder. It is all in a moulded assembly. You could change the fuse, but that is not resetting a device as you would in a consumer unit. For most intended use the KMF is providing HRC fuse  protection usually upstream of a DBO  in a domestic. It is usually not touched by ordinary persons; they would be accessing the consumer unit. The KMF is just a bigger, beefier device than your 13 amp switch fuse connection unit and we do not usually require those to be steel.

"It is not manufactured as an assembly to BS EN 61439-3 as it is not a consumer unit "



Interesting - I thought most would have considered a switchfuse as coming under the heading of 'similar swicthgear' - being pretty much identical in function to a 1-way CU (DP incomer, feeding one OPD, suitable for use at the origin of an installation and so on).

Like a shark AJ ?


It , the KMF, is not manufactured as an assembly to BS EN61439-3, as it is not a consumer unit.


However, if there is only a KMF and no consumer unit- unlikely- then the intended use changes and would not be in the spirit of 421 etc.


There are no steel moulded 800KMFs; though there briefly was, though to what BS is lost in time.


Some may chose to manufacture a switch fuse to 61439-3, as opposed to the specific KMF.


In the KMF, you cannot change the fuse holder. It is all in a moulded assembly. You could change the fuse, but that is not resetting a device as you would in a consumer unit. For most intended use the KMF is providing HRC fuse  protection usually upstream of a DBO  in a domestic. It is usually not touched by ordinary persons; they would be accessing the consumer unit. The KMF is just a bigger, beefier device than your 13 amp switch fuse connection unit and we do not usually require those to be steel.