Glass HV Fuse - supply ??? dims .. 80mm x 6 mm 500mA glass

fuse is breaking 1700v Dc , looks to be part powder filled

Any ideas as to supply ? trade mark looks to be 'S' in a
rectangular box

Tnx

G ..

In article ,
Graham wrote:
Glass HV Fuse - supply ??? dims .. 80mm x 6 mm 500mA glass

fuse is breaking 1700v Dc , looks to be part powder filled

Any ideas as to supply ? trade mark looks to be 'S' in a
rectangular box


Bussman type HVA is a larger diameter, but the right length and available
in half-amp size with plenty of high voltage interrupting ability.
http://host1.publiquik.com/bussmann_...?familyUid=137
They are fairly common in broadcast transmitters.

Give the Bussman rep a call; he may be able to locate something of a
smaller diameter. You want to talk to the electrical power guys, and
not the electronics guys.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Graham wrote:
Glass HV Fuse - supply ??? dims .. 80mm x 6 mm 500mA glass

fuse is breaking 1700v Dc , looks to be part powder filled

Any ideas as to supply ? trade mark looks to be 'S' in a
rectangular box

Tnx

G ..
check your local electrical supply house. be ready to pay big.


D

On Jan 2, 6:41*pm, "David G. Nagel" wrote:
Graham wrote:
Glass *HV Fuse *- supply ??? * dims .. 80mm x 6 mm * 500mA *glass

fuse is breaking *1700v Dc , looks to be part powder filled

Any ideas as to *supply ? *trade mark looks to *be *'S' in a
rectangular box

Tnx

G ..

check your local electrical supply house. be ready to pay big.

D

Ok thanks for the link , thats very close , this is from a skanti
400 w ssb tx , but as its no longer in production, the makers are not
'helping' looks like the easey way may be to use a 500mA microwave
oven fuse ... but i dont think that will be a 'quick blow' type of
fuse , the pa uses qty 2 4cx250-b in parallel and a big 400hz
invertor psu running from 24 v dc @ 45 amps for the whole set ...

Thank's

Graham ..

Graham wrote:
Ok thanks for the link , thats very close , this is from a skanti
400 w ssb tx , but as its no longer in production, the makers are not
'helping' looks like the easey way may be to use a 500mA microwave
oven fuse ... but i dont think that will be a 'quick blow' type of
fuse , the pa uses qty 2 4cx250-b in parallel and a big 400hz
invertor psu running from 24 v dc @ 45 amps for the whole set ...

Microwave oven fuses are on the transformer primary and are normally
intended for 250VAC maximum use. 3AG types will sustain an arc for a hell
of a long time with 1KVDC across them. Remember, AC arcs will quench a
lot easier than DC.

Call Bussman and see what they can do for you.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

On Jan 2, 10:01*pm, (Scott Dorsey) wrote:
Graham wrote:
Ok thanks for the link , thats very close , this is from a *skanti
400 w ssb tx , but as its no longer in production, the makers are not
'helping' * looks like the easey way may be to *use a 500mA microwave
oven fuse ... but i dont think that will be a 'quick blow' type of
fuse , the pa uses *qty *2 *4cx250-b in parallel and a big *400hz
invertor psu running from 24 v dc @ 45 amps for the whole set ...

Microwave oven fuses are on the transformer primary and are normally
intended for 250VAC maximum use. *3AG types will sustain an arc for a hell
of a long time with 1KVDC across them. *Remember, AC arcs will quench a
lot easier than DC.

Call Bussman and see what they can do for you.
--scott
--
"C'est un Nagra. *C'est suisse, et tres, tres precis."


oK , The fuse ive had to use in the past is 500mA @ 5 Kv , it would
be nicer to fit the original , even the microwave ones are not
cheap !

Ill try them in the moring - tnx - G ..

http://www.signalsuk.com/signalsuk.n...2?OpenDocument

I had always seen ceramic -- instead of glass (fuses) -- in this
applicaiton


"Graham" wrote in message
...
Glass HV Fuse - supply ??? dims .. 80mm x 6 mm 500mA glass

fuse is breaking 1700v Dc , looks to be part powder filled

Any ideas as to supply ? trade mark looks to be 'S' in a
rectangular box

Tnx

G ..

gb wrote:
I had always seen ceramic -- instead of glass (fuses) -- in this
applicaiton

A lot of HV fuses are filled with a ceramic powder or with boric acid to
quench the arc faster when they break. If you do that, there's no reason
to use a glass tube since there's nothing to see inside anyway.

The ceramic cases are also less apt to explode when the fuse blows.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."