Author Topic: Circuit Protection  (Read 814 times)

Offline abstruse1

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Circuit Protection
« on: October 15, 2021, 10:49:10 PM »
Greetings.  I've been using varistors to protect power supplies from high voltage spikes.  As I understand it, these things go from very high resistance to very low resistance when their "varistor voltage" is reached, and they shunt the spike to ground.  i just blew one up (sounded like small firecracker) that was across the output of a 50 v. benchtop DC power supply set to 10 VDC.  Dunno what caused this.

Are there such devices that work the opposite, namely going from low resistance to high resisitance when a spike comes along?  Like a fuse.
Abstruse1
   Been working with electricity for 60 years and still getting a tingle!

Offline klugesmith

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Re: Circuit Protection
« Reply #1 on: October 17, 2021, 01:49:47 AM »
Quote from: abstruse1
...Are there such devices that work the opposite, namely going from low resistance to high resistance when a spike comes along?  Like a fuse.
What does an un-operated fuse, or any low resistance device in series with your power supply, know of voltage?

There are things that switch to high resistance upon overcurrent, analogous to those switching to low resistance upon overvoltage.    Over by what ratio, how rapidly does the stress rise, how fast must the device operate, etc.?

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Re: Circuit Protection
« Reply #1 on: October 17, 2021, 01:49:47 AM »

 


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