What do you think of this? 9500A with safety glasses only.

https://www.youtube.com/watch?v=CkqdzyQ0350

I'd trust those breakers before I'd trust this window film like these guys are:

https://www.youtube.com/watch?v=bAiD2VKh8z8

Thanks for sharing.

I'll have to see if those are in the latest SKM library.

I would be very curious about the clearing time of this device. With no spark it seems clearing would have to be pretty close to T=0. Even very fast current limiting fuses allow some current and resulting incident energy.

Also wonder what the upper limit of available short circuit current would be - i.e. device interrupting rating.

Thanks for sharing!

Other's thoughts?

From their website:

3 uS and 100 kA.

That's 1/5556 Cycles at 60 Hz by my math. Even if they can really sample that fast (I don't see a sampling rate), I'm not sure that fault current looks much different from load in that time.

The other question is leakage current. Are they rated as isolation devices or is a separate disconnect required for isolation? Since they have semiconductor in series with contact (air gap) what is the method to prove that the air gap is actually open and effective?

SS devices are very fast. Certainly under 1/2 cycle and potential under a millisecond. The main source of time is sensing and the decision making required to cause a trip not the clearing itself. I know of MEMS technology that can interrupt, for all intends and purposes, an infinite amount of prospective short circuit amperes (AC or DC) in microseconds... it has to do it that fast. As you get to these alternate technologies the rules are different!