The idea is to ensure the supply does not draw more than 100A and blow the main fuse having to call in the provider, as heavy appliances may be fitted. So, from incomer to 100 mcb and to the rest of the CU (RCD, etc), all inside the CU, not having the 100A mcb outside the CU in a separate casing.
100A mcb
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Which is probably more than the "contract to supply" allows to be taken.
With a 100A fuse and a 100A MCB, there are no guarantees as to which will disconnect first. It depends on the extent of the overload and for how long.
For more uncertainty, old fuses which have been overloaded in the past may fail sooner than expected. Old overloaded MCBs may do likewise. Or not.
For more uncertainty, old fuses which have been overloaded in the past may fail sooner than expected. Old overloaded MCBs may do likewise. Or not.
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Do they exist, 100amp would more likely be a MCCB, these would normally fit in place of a Main switch in a more industrial type board, for a new install you would more likely use a 3 or 4 pole , but you can fit an incomer kit to link out for single phase
don't count on it.
They may have a company fuseholder with "100A" printed on it.
What's inside might be quite different.
Looked and Schneider appear to do them:
https://www.schneider-electric.co.uk/en/product-range/61088-c120/
https://www.schneider-electric.co.uk/en/product-range/61088-c120/
See my post and link
That means having to buy a Schneider CU.
SP, 100A MCB
Won't they fit a Chint CU then?
If (like everyone else's) their MCBs are the same height as the main switches, there's probably a 2- or 4-unit wide switch enclosure to fit.
Here's an old example.
View media item 820
the same switch as is found in
View media item 6822
More modern enclosures tend to be bigger and sturdier (large cables may exert twisting force)
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