Transformer inrush current

[Jc1996]

Is there a way you can calculate inrush current in a transformer I’ve got a 230-110v 3Kva transformer that’s I think has been installed on a breaker that is too small (16amp type c)

 

[SLX]

I believe you can apply a rule of thumb calc. Multiply the rated current by 80%. (current x 0.8). Add that result to the nominal current to allow for in rush.

 

[Andy™]

if it trips, its probably using too much...

 

[Murdoch]

If the circuit tests out OK, then a change to a 20A type D MCB should be considered.......

 

[Jc1996]

if it trips, its probably using too much...

It held up and I think it was then drawing under an amp on my clamp meter so the reason why I asked

 

[Jc1996]

I believe you can apply a rule of thumb calc. Multiply the rated current by 80%. (current x 0.8). Add that result to the nominal current to allow for in rush.

So 23 ish amps inrush