Component's Name [Case: In Deffibrilator/DC Shock Board]

Hey, recently my friends and I tear down a defibrilator machine or a DC shock. We found some strange components that we never seen.
I mark the components with red line.


can you guys tell me what is the name of the component? and what it is for?
The designated name for those components are VSP

Thank you!
regards, 
nug

They look like spark gap surge arresters.

OldSteve:
They look like spark gap surge arresters.

thank you for the hint, i guess the article from wikipedia (Spark gap - Wikipedia) will explain its functions.

Thankyou
:slight_smile: :slight_smile:

Maybe this is better. They are gas discharge protection devices.

Which are probably specialized neon bulbs. [ With a well-behaved breakdown voltage and high current capacity. ]

MarkT:
Which are probably specialized neon bulbs. [ With a well-behaved breakdown voltage and high current capacity. ]

… and this technology was in common use before the zener diode :slight_smile:
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