Very Fast response fuse required...

Posted by bbkv_tom on February 16, 2009, 2:05 pm

-------------------------------------
I was doing a Certification test for my product which has three 20A fuses
(Littlefuse make, 324020P) connected in parallel at the input lines (phase
and neutral).
i was doing short circuit test which always trips the main Circuit breaker
rather blowing the fuse..
The CB(BQ3B050, Siemens) is rated for 50A..i tried providing 15A in
parallel for the product still CB trips..
Short circuit current seems to be of approx 900A and the CB trips within
3-5mS.
when looked at the datsheet of CB and Fuse..CB seems to have better
response time than the fuse..Is there any type of fuse available which is
very fast acting..and can be available at 20A and 240VAC ratings..and will
not blow if tests like surge test( high current for very short duration)
is done..

Thanks in advance

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Posted by zero on February 16, 2009, 2:40 pm

> -------------------------------------

> I was doing a Certification test for my product....

Oh really?

> when looked at the datsheet of CB and Fuse..CB seems to have better
> response time than the fuse..Is there any type of fuse available which is
> very fast acting..and can be
<snip>

If you know that little about circuit breakers (or do
you mean CB Radios?) I would not pass your
"Certification Test".

....Oh, EVERYONE reading this knows you're trying to fix
a problem you're having. And the whole "test" story
is lame and weak.

Why don't you guys just stick to stuccoing stuff?

Good luck, though.

-zero

> Thanks in advance
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> alt.hvac - 28082 messages and counting!
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Posted by bbkv_tom on February 16, 2009, 3:11 pm

bbkv_tom had written this in response to
http://www.thestuccocompany.com/hvac/Re-Very-Fast-response-fuse-required-37026-.htm
:

-------------------------------------
zero wrote:

> message

>> -------------------------------------

>> I was doing a Certification test for my product....

> Oh really?

>>yes...i'm indeed doing it since i'm a part time contractor working as a

testing person..i dint do the design or good in designing..i was asked to do
some testing for which some procedures were given..
i thot of understanding a little bit of what was actually going
wrong...the few details which i gave was my findings in the last few
days..yet not able to find a solution..sorry if i posted this in the wrong
place..
thanks for your response anyway..

>> when looked at the datsheet of CB and Fuse..CB seems to have
>> better
>> response time than the fuse..Is there any type of fuse available
>> which is
>> very fast acting..and can be

> If you know that little about circuit breakers (or do
> you mean CB Radios?) I would not pass your
> "Certification Test".

> ....Oh, EVERYONE reading this knows you're trying to fix
> a problem you're having. And the whole "test" story
> is lame and weak.

> Why don't you guys just stick to stuccoing stuff?

> Good luck, though.

> -zero

>> Thanks in advance
>> ##-----------------------------------------------##
>> Delivered via http://www.thestuccocompany.com/
>> Building Construction and Maintenance Forum
>> Web and RSS access to your favorite newsgroup -
>> alt.hvac - 28082 messages and counting!
>> ##-----------------------------------------------##

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