Hi Curt:
A quick Google search comes up with a lot of manufacturers'
data curves:
http://www.accontrols.com/Typical%20Circuit%20Breaker%20Trip%20Curve.pdf
http://ecatalog.squared.com/pubs/Ci
cuit%20Protection/Molded%20Case%20Circu
t%20Breakers/Thermal%20Magnetic%20Molde
%20Case%20Circuit%20Breakers/FA-FC-FH/0600DB0105.pdf
One of these references suggests UL 489 is one "basic"
standard for circuit breakers:
http://ulstandardsinfonet.ul.com/tocs/tocs.asp?doc=s&fn=0489.toc
http://literature.rockwellautomatio
.com/idc/groups/literature/documents/td/1489-td001_-en-p.pdf
http://aero-defense.ihs.com/document/abstract/BXHHFBAAAAAAAAAA
Here is a comparison between UL 489 and ANSI C37:
http://ecatalog.squared.com/pubs/Ci
cuit%20Protection/Low%20Voltage%20Power
20Circuit%20Breakers/Masterpact%20NT%20
L%201066-ANSI%20Circuit%20Breakers/0613DB9902.pdf
Here is some explanatory material:
http://www.gcf-inc.com/GCF_Explains_UL_489.pdf
Hope these references answer your questions.
Good luck!
Rich
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Bender,
Curtis
Sent: Friday, August 21, 2009 1:54 PM
To: [email protected]
Subject: Standard for AC breaker trip curve - [safety]
Greetings members.
Can someone point me to the “basic” standard that would be the
foundation
for household circuit breaker trip curves? 120V (North America) and 230V
(Internationally) specifically. I saw on one curve the NEMA AB-2 which does
not exist on the NEMA site.
Typical abnormals in UL standards are done at the points listed below
which
seems to indicate where the curve would need to safely reside.
110% - 7 hours
135% - 1 hour
200% - 2 minutes.
Can one of you fine people refer me to where the requirement(s) would
come
from? NEMA, IEC, NEC LMNOP?
Curt
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