"Andrew Gabriel" wrote in message
.. .
In article ,
"BillP" writes:
Short Version.

Does anyone know if you can replace MEM type 1 M6 5A 51QEB circuit
breaker
with a 6A type C. Will it fit the DIN rail and not foul the cover?

They're obsolete (part of the old British Standard range), and
Type 1 breakers were too sensitive for most uses, and there is
no equivalent rating in the new EN range. Type B is (roughly)
Type 2, and Type C is (roughly) Type 3. I always use Type C
breakers for domestic lighting circuits, but even they can
trip when a lamp arcs across internally when it dies, depending
on cable lengths and how near you are to the supply. If you
really want to prevent this, a 5A BS1361 cartidge fuse carrier
would be a better prospect.

I can't comment on the ability to fit breakers into older CU's,
which is a separate matter. You would need to say what model
CU you have, and someone may then know. MEM have changed their
ranges over the years.

--
Andrew Gabriel

I'll get hold of a 6A mcb and offer it up and see.

Thanks Andrew