Re: [CAD_CAM_EDM_DRO] Transformer Soft Start

What you need is a surge arrestor. They are a positive temperature
coefficient thermistor designed to reduce switch on surges.

You put the surge arrestor in series with the transformer. When it is cold
it has a reitively high resistance which limits the surge. When you pass
current through it, it heats up and the resistance drops to a very low
level.

Where are you based? I can supply RS components (UK) order codes if that is
any help.

Les

>
> Can anyone in this group advise me on a suitable circuit for soft
> starting a 230v primary, 40v secondary 1000VA toriordal transformer.
>
> I have one I want to use with my Gecko 201's, but it keeps blowing
> the mains fuze on power up.
>
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