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From: Kari Laine on 18 Jul 2010 15:38
Hi,

it is the thunder season here in Finland so I got interested how these
surge protectors are built - which say they will save you hardware from
spikes - yeah....

Are there avalanche diodes and coils?

I have a dim feeling I have asked this before...


Best Regards
Kari


--
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http://www.byvac.com
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From: Nobody on 18 Jul 2010 15:54
On Sun, 18 Jul 2010 22:38:25 +0300, Kari Laine wrote:

> it is the thunder season here in Finland so I got interested how these
> surge protectors are built - which say they will save you hardware from
> spikes - yeah....
>
> Are there avalanche diodes and coils?

A voltage-dependent resistor, usually.

From: John Doe on 18 Jul 2010 21:22
Kari Laine <klaine8(a)gmail.com> wrote:

> Hi,

Lo

> it is the thunder season here in Finland so I got interested how
> these surge protectors are built - which say they will save you
> hardware from spikes - yeah....

High voltage causes a MOV (metal oxide varistor) to close. Both
the input and output points become the same voltage, preventing
current flow through the circuit.
--





















>
> Are there avalanche diodes and coils?
>
> I have a dim feeling I have asked this before...
>
>
> Best Regards Kari
>
>

From: Michael A. Terrell on 18 Jul 2010 23:40

Kari Laine wrote:
>
> Hi,
>
> it is the thunder season here in Finland so I got interested how these
> surge protectors are built - which say they will save you hardware from
> spikes - yeah....


You have a season? It's pretty much year round in Florida.


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
From: pimpom on 19 Jul 2010 01:15
Kari Laine wrote:
> Hi,
>
> it is the thunder season here in Finland so I got interested
> how these
> surge protectors are built - which say they will save you
> hardware
> from spikes - yeah....
>
> Are there avalanche diodes and coils?
>
> I have a dim feeling I have asked this before...
>

A common surge protection device is a Voltage-Dependent Resistor
(VDR), also called a Metal Oxide Varistor (MOV) or simply a
varistor. It acts rather like two zener diodes back to back. It's
placed across the power line and does nothing when the voltage is
within normal limits, passing only a small leakage current. When
the line voltage exceeds a certain limit, the varistor breaks
down and acts as a shunt. It can absorb large amounts of energy
from momentary spikes, but when the high voltage is sustained,
the varistor breaks down permanently. It may burn up or even
explode. Even then, it may have done a useful job by blowing a
fuse.

However, it's a good idea to keep in mind that few, if any,
protection schemes are 100% foolproof. For more details, you may
want to read up on MOVs/VDRs on the net.


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