Fuse carrier for Fusebox

[Taylortwocities]

The primary current of the 1.26kva is about 5.5A.

Yes. Thanks. I know!
Circuit is supply > 20A C curve MCB > 13A FCU > Contactor (operated by Thermostat) > transformer. All wired in 2.5milli T&E.

 

[pc1966]

It might still be inrush currents if the primary of the transformer is switched by some thermostat.

I know that toroidal transformers seem to be worse for inrush than some of the traditional EI style laminated things but not sure why (should look it up some time!). What I have done in the past is to fit NTP thermistors as inrush-suppressors but then you need somewhere to put a box and terminals, etc, for that devices. This sort of thing:

B57127P0509M301 | EPCOS Thermistor, 5Ω Resistance, NTC Type, 31 x 7mm | RS

uk.rs-online.com

However, they are designed to run hot, so they sit at 80-120C when "stable", and any box & terminals has to allow for that. They don't need cooling - kind of defeats their purpose - but we always used ceramic "choc blocks" for fixing them just due to this, and leave a good cm or so of wire between the terminal and device as well. If sleeving use silicone or glass-fibre as PVC won't be happy at those temperatures, but in a sealed box it is not really needed.

 

[Soi disant]

I see Fusebox doesnt do D curve,

Given their domestic market focus that doesn't surprise...

separate box isn’t going to work.

No room anywhere for a small enclosure?

so I’ll investigate alignment of Hager v Fusebox busbar.

Fusebox MCBs will be badge engineered - have a look at other "makes" with the same appearance.

Never looked at one, but will they accomodate a cable as well as a busbar prong?

It’s never easy, is it ?

If it was it wouldn't be fun.

They say.

 

[Soi disant]

For some reason I replied without reading this.

Circuit is supply > 20A C curve MCB > 13A FCU > Contactor (operated by Thermostat) > transformer. All wired in 2.5milli T&E.

If there's that FCU, why have high current MCB -> fuse -> FCU? Why not just put in the bigger MCB. It only has to do fault protection, but you could replace the cable with a larger one.