I simply use a contactor to engage my pfc bank. I have 500 uFd worth, which will draw a whopping 42 amps with no inductive load from the pure capacitive reactance. They definitely do tend to reduce the wall plug current draw when the heavy inductive load of the big transformer is online, though. I don’t think it really matters whether or not you engage them “under load” or not.
David Rieben
Sent from my iPhone
> On Aug 29, 2019, at 7:51 AM, Daniel Kunkel <dankunkel@xxxxxxxxx> wrote:
>
> I am building a power supply cabinet to handle my next build and I would
> like to incorporate a gang of PFC caps with switches to be able to enable
> them at will.
>
> Specs:
> Supply current will be 240VAC @ 25amps
> PFC will be 276uF according to JavaTC
>
> Questions:
> 1) I need to buy some switches but I am not sure how robust they need to
> be. How much current will the switches actually need to handle?
> 2) My assumption is that I should not turn the switches on/off while the
> coil is running. True?
>
> Thanks,
> ~Dan
> Kansas City area
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