How to switch on a POWER SUPPLY w/o sparks

I got some of those AC/DC supplies for charging big batteries. Those Kingpan, whatsoever named types. I guess most of you know them. Come in different wattages and are quite capable.

I now use one to power a programmable desk power supply that takes 60V as input and needs up to 600W, so the PS is ideal for that.

But I don't want it powered on all day long. They have a little switch on the side, but this is bad quality and tends to melt. The PS has big capacitors that cause my USV to start when I plug it into the wall socket. The power surge seems to be quite immense.

So I'm looking for a proper way to turn those on and off.

Any ideas?

Normally I see a NTC inrush limiter in series with the bridge rectifier or AC line to soften the turn-on.

Here is an application note:
https://product.tdk.com/info/en/pro...ent/ntc-limiter/technote/apn-ntc-limiter.html

Thanks fechter. How would I size this NTC? We got 220V and the PS has a 800W rating. So the NTC has to withstand 5A?

This one is ONE Ohm and 20A. Would that suit? It's quite pricey though as well

https://www.conrad.at/de/p/tdk-b57464s0109m000-ntc-temperatur-waechter-einschaltstrombegrenzer-1-s464-radial-bedrahtet-419752.html

or 10pcs of it from aliexpress for the same price

https://www.aliexpress.com/item/1047795580.html?spm=a2g0o.productlist.0.0.4c0241f1vA42VC&algo_pvid=602659ea-1f78-450c-98c6-693f49ea87b9&algo_expid=602659ea-1f78-450c-98c6-693f49ea87b9-0&btsid=0b0a556316034345304254230ec522&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

There are some formulas you can use to see what size is recommended. I think the one you linked to will work but may be overkill size wise, which would be OK. The thing I linked to had a PDF link but you need to request it with a form.

Here is another selection guide:
https://www.powerelectronics.com/community/article/21860750/how-do-you-choose-the-right-type-of-ntc-thermistor-to-limit-inrush-current-for-capacitive-applications