Thanks Scott.
My stuff is electronic with no mothers etc, just input filter caps
and inductors. The manufacturer gives various trip curves and they address
just these issues. So I think I am covered on that. These seem to be a bit
pricey if you ask me so I am going to look at the thermals as well, but
these are for outdoor boxes with sun loading and all of that. So heat is a
concern - but then seems to be alot of industrial equipment made by others
that would fall into the outdoor category as well, so I may be a bit over
cautious here. The search goes on. Thanks for the input
Gary
-Original Message-
From: Scott Lacey [mailto:sco...@world.std.com]
Sent: Sunday, October 21, 2001 6:09 AM
To: Gary McInturff
Cc: emc-p...@ieee.org
Subject: RE: high temperature circuit breaker
Gary, Kris,
If these are indeed magnetic breakers, one point of caution should be
advised. An ordinary magnetic breaker is very sensitive to high inrush
currents from motors and transformers. They will often trip from these
(normal) inrush currents. In such cases a motor rated version needs to be
specified. They have additional damping to delay response time.
Scott Lacey
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Gary McInturff
Sent: Friday, October 19, 2001 1:36 PM
To: 'kristiaan.carpent...@alcatel.be'; emc-p...@majordomo.ieee.org
Subject: RE: high temperature circuit breaker
Neither endorsing or rejecting these breakers I just happen to be
doing a little research of my own and have a spec sheet open in front of me
on these things.
Square D has a Multi-9 series of breakers that shows an operating
temperature of -30 to -70 C. and tropical treatment 2 for 95% rh of 95% at
55C.
I haven't looked any further to see if they are Listed/Certified to
those temperatures or if those are just the marketing numbers so you'll want
to follow-up on that.
They have a wider range of amperage ratings than the others I have
quickly reviewed. I happen to be looking at a 2 amp breaker and typically
those have only been Listed for Supplemental Protectors rather than Branch
Circuit protection.
You also want to consider whether they are thermal or magnetic
breakers. If your worried about high temperatures you probably want to look
at the magnetic breakers because they are less heat sensitive.
Here is a link
http://www.squared.com/us/products/circuit_breakers.nsf/unid/B7E8BB545346010
D85256AA30051A705/$file/multi9ul489breakersFrameset.htm
Good luck
Gary
-Original Message-
From: kristiaan.carpent...@alcatel.be
[mailto:kristiaan.carpent...@alcatel.be]
Sent: Friday, October 19, 2001 7:24 AM
To: emc-p...@majordomo.ieee.org
Subject: high temperature circuitbreaker
Hello group,
Circuit breakers and residual current operated circuitbreakers for
house-hold applications are typically cetified at 40 degree Celcius.
If these types are built into other products, they do not comply with their
temperature rating as specified in the safety certificate.
Does any-one know about references to circuit-breakers(230V ac, 10A) that
can work safely at higher temperatures (70...90 degrees)
Regards,
Kris Carpentier
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