ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
fuse rejectors
by NORCAL. 03/29/17 01:44 AM
Old decora style outlets
by NORCAL. 03/29/17 01:41 AM
NFPA stuff
by gfretwell. 03/28/17 08:08 PM
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,882 Are you busy
166,762 Re: Forum
160,878 Need opinion
Who's Online Now
0 registered members (), 90 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#2039 - 06/16/01 12:46 PM How breaker works?  
Mike Shn  Offline
Member
Joined: Jun 2001
Posts: 25
New York
Hello
Can someone explain to me or give me a link to about breaker?
Thanks


Work Gear for Electricians and the Trades

#2040 - 06/16/01 03:25 PM Re: How breaker works?  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I don't know of any links, so I'll give this a shot.

most breakers that you're likely to encounter are thermal-magnetic.

The thermal part has a bi-metallic strip. Since the 2 metals expand & contract at different rates, the strip will bend as it heats up. If it bends enough, it will engage a trip mechanism and turn off the current. This is for overloads.

The magnetic part consists of a small coil in series with the load. When enough current flows, the magnetic field is strong enough to acuate the trip mechanism. This part is for short circuits, ground faults or any other large current flow.

Tom


Few things are harder to put up with than the annoyance of a good example.

#2041 - 06/16/01 03:45 PM Re: How breaker works?  
RICK 44  Offline
Junior Member
Joined: Jun 2001
Posts: 5
http://www.tpub.com/neets/book3/8i.htm
Mike
Look around in this site, think youll find more info than you want.


#2042 - 06/17/01 12:05 PM Re: How breaker works?  
Phil H  Offline
Member
Joined: Apr 2001
Posts: 21
Tujunga, CA
Square D has this about breakers: Overcurrent Protection
The 23 page adobe acrobat file is about 1.4mb.

[This message has been edited by Phil H (edited 06-17-2001).]



Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.010s Queries: 14 (0.002s) Memory: 0.7571 MB (Peak: 0.8884 MB) Zlib enabled. Server Time: 2017-03-30 18:27:07 UTC