Previous in Forum: Neutral to Ground Voltage   Next in Forum: Battery Outgassing
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
4 comments
Rate Comments: Nested
ramydiab
Active Contributor

Join Date: Jan 2008
Posts: 24

Circuit Breaker Rating

01/30/2012 3:07 PM

i wanna know what is the difference between iu and in. i have a circuit breaker that has the following nameplate in=63 A , iu= 160A
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15603
Good Answers: 982
#1

Re: circuit breaker rating

01/30/2012 3:29 PM

If you want an accurate answer without any guessing I'd look at the manufacturer's website for application notes and your specific part specifications.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply
SolarEagle
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#2

Re: circuit breaker rating

01/30/2012 4:04 PM

in=63A is the max current at specified temp, and I believe that the iu=160A is probably short circuit max current, but I could be wrong..

__________________
 All living things seek to control their own destiny....this is the purpose of life
Register to Reply
wareagle
Guru
United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#3

Re: Circuit Breaker Rating

01/30/2012 4:56 PM

Could that be Ui in volts?

http://www.electrical-installation.org/enwiki/Circuit-breaker
Register to Reply
JRaef
Guru
United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 4665
Good Answers: 804
#4

Re: Circuit Breaker Rating

01/30/2012 6:13 PM

From IEC 60947-3

Rated uninterrupted current (Iu)

The rated uninterrupted current of an equipment is a value of current, stated by the

manufacturer, which the equipment can carry in uninterrupted duty.

__________________
 ** All I every really wanted to be, was... A LUMBERJACK!.**
Register to Reply
Register to Reply
Have a Different Question?
4 comments
Copy to Clipboard

Users who posted comments:

JRaef (1); redfred (1); SolarEagle (1); wareagle (1)

Previous in Forum: Neutral to Ground Voltage   Next in Forum: Battery Outgassing

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (77 right now)
Show Members
Advertisement