Previous in Forum: electrical power in power generation   Next in Forum: Energy resource
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
5 comments
Rate Comments: Nested
conveo
Active Contributor

Join Date: Dec 2008
Location: Ha Noi - Viet Nam
Posts: 20

Choosing Circuit Breaker

08/28/2009 6:14 AM

Hi everybody.

Now, i have a project. I have to choose a circuit breaker for distribution system. I have a circuit breaker catalog of Siemens, in this catalog i see two parameters that i can't discriminate them:

- Rate short circuit breaking current.

- Rate short circuit making current.

Anybody helps me to explain what they mean.

Thank you very much.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Choosing circuit breaker.

08/28/2009 6:25 AM

The first is the maximum current that the device will experience when the contacts open. It is available from the Prospective Fault Current, which should be available from the installer's test certificate for the cabling.

The second is the maximum current that the device will experience when the contacts close.

The two currents should be the same.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
2
msamad
Guru

Join Date: Feb 2009
Location: Houston, USA
Posts: 946
Good Answers: 244
#2
In reply to #1

Re: Choosing circuit breaker.

08/28/2009 9:44 AM

Please see the previous thread http://cr4.globalspec.com/thread/37632 and you will find the detail answer.

- MS

__________________
 "All my technical advices in this forum must be consulted with and approved by a local registered professional engineer before implementation" - Mohammed Samad (Linkedin Profile: http://www.linkedin.com/in/msamad)
Register to Reply Good Answer (Score 2)
No more Good Answers. Go to first "Almost" Good Answer
conveo
Active Contributor

Join Date: Dec 2008
Location: Ha Noi - Viet Nam
Posts: 20
#3
In reply to #2

Re: Choosing circuit breaker.

08/29/2009 3:09 AM

thank you very much
Register to Reply
DRFREON
Power-User

Join Date: Nov 2008
Posts: 158
Good Answers: 1
#4

Re: Choosing Circuit Breaker

08/29/2009 7:33 AM

Sorry to inform you of this, but please remember the importance of accuracy:

LEARN ENGLISH FIRST, THEN GRAMMAR, PLEASE !
Register to Reply
capblanc
Guru

Join Date: Jul 2008
Location: Mallorca, Spain
Posts: 567
Good Answers: 15
#5
In reply to #4

Re: Choosing Circuit Breaker

08/29/2009 1:30 PM

DrFreon,

Don't be so rude. Conveo's first language is presumably Vietnamese. How is your Vietnamese? Or any other language for that matter? Tolerance is a virtue. If you do not understand something just ask for clarification.

Chas

__________________
 En la casa del herrero, cuchillos de palo!
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
Register to Reply
Have a Different Question?
5 comments

Good Answers:

These comments received enough positive votes to make them "good answers".

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

capblanc (1); conveo (1); DRFREON (1); msamad (1); PWSlack (1)

Previous in Forum: electrical power in power generation   Next in Forum: Energy resource

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 (53 right now)
Show Members
Advertisement