Andy Burns wrote in news:i40pbeF758iU1
@mid.individual.net:

ARW wrote:

Andy Burns wrote:

PeterC wrote:

What's the point of big RCBOs?

I think the first generation RCBOs were taller, then they managed to
shrink them to MCB size in secondÂ* generation, so I don't think
there's any 'point' as such to the tall ones.

The small ones often do not have the functional earth fly lead.

Apparently Chint can squeeze a 3-ph RCBO into a single-width module ...

https://screwfix.com/c/c/c/cat7230024#&brand=chint


Seems Screwfix is becoming quite the specialist electrical supplier with
33 of their 105 RCBOs now 3ph and a choice of 3 makes on offer.

The Chint is both 3ph & 1 pole, neat space saving trick.

They're doing pre-stripped (as opposed to striped) earth wire too, that
will save some work.

More seriously, it's good to see that 3ph RCBOs are becoming available
(Hager etc), a pal had a holiday cottages setup with swimming pool and he
had a hell of a job tracking down some nuisance trips through all of the
water based elements running off single RCDs. I wanted to suggest
converting his board to 3ph RCBOs but I couldn't find any (this was a
while ago).