Hello,

I have accidentally applied 230VAC to a 24VAC valve (an external fuse was blown). The valve has a control board and it can be controlld via 4...20mA and gives feedback as well. There are 2 PCB connected with wires as you can see in the images added.
I opened it up and I can only find one burnt element on it, which for me seems to be a transient voltage suppressor. It now measures short, but the traces around it are connected. The writing on the element is "AUTO K30 1741" - I could not find a part like this online.
When now applying 24VAC to the valve...

Re: 230VAC PSU connected to 400VAC

Thank you everyone for your replies! I added more pictures so the board is better visible.
To answer your questions:
@stj
The fuse is ceramic. You can see it in one of the pictures.
A complete noob question, but can I try to just pull out the fuse or are fuse holders like this meant to be desoldered to replace the fuse?

@budm
I have a decent soldering station, solder wick and a multimeter. Do you recommend any other tools?...

I accidentally connected a 230 VAC to 24 VDC PSU to 400 VAC. After about 5 seconds there was a spark and then the mains circuit breaker tripped. I have added the pictures of how the damage on the PSU looks in the attachments. The PSU's model is PULSE QS10.241.
I don't have much experience in fixing electronics and no PSUs at all. How should I go about fixing this? The varistor clearly needs to be changed and the big capacitor most likely as well. I don't see anything else visibly damaged, could changing just these 2 parts fix the PSU? Are there any tests that can be done before I connected...

Re: New Members - please post your introductions here

Hello everyone!
My name is Ivars and I am from Latvia.
I work as an electrician and sometimes do some hobbyist electronics with Arduino.