Hi guys

As the title, what is this? thanks guys!

 

Here you go.

 

It's a gas discharge tube- transient voltage protector.

 

transient arrestor

 

also sometimes called surge arrestor

 

you should google all variants:

transient arrester, transient arrestor
surge arrester, surge arrestor

according to wikipedia, there are many kinds:
http://en.wikipedia.org/wiki/Surge_arrester

But arrestor is more common actually.

 

transient voltage surge suppressor
http://en.wikipedia.org/wiki/Surge_protector

 

A device similar, is used in non-thyristor electronic photo strobes, and there called a "quench tube"... part of the charge on the main capacitor that isn't used for the flash, turned off by a phototransistor circuit, is redirected to the quench tube, and does not illuminate the photo...

 

Hi guys

As the title, what is this? thanks guys!

View attachment 74708

Looks like a professional grade phone equipment surge arrestor, the cheaper glass tube variety are often found in CDI gas igniters.

I have some larger ones rated a few kV that were found protecting the focus circuitry on a Hitachi Studio 19 Sun monitor.

The phone ones are usually rated around 220 - 230V ish.