3ph contactor no Neutral

[jmtisme]

Was working on a control pan. The other day noticed the 3phase supply has no Neutral how does the the pull coil work on this type of pannel

 

[stef]

Either with a control transformer (quite common technique on the continent) or 415 V coils (unlikely)

 

[davelerave]

24v ac would be common via a trafo 415/24

a pole of the secondary may be earthed-handy for troubleshooting

 

[Hawk81]

is there a transformer in the panel. Ie 415v to 24v if no transformer then they must be 415v coils which need just 2 phases to work.

 

[jmtisme]

yep its the control transformer it had two transformers inside it that explains it cheers