The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
Yesterday at 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 15
HotLine1 10
Trumpy 8
Texas_Ranger 8
sparkyinak 7
Who's Online
0 registered (), 107 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#2039 - 06/16/01 09:46 AM How breaker works?
Mike Shn Offline
Member

Registered: 06/13/01
Posts: 26
Loc: New York
Hello
Can someone explain to me or give me a link to about breaker?
Thanks

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#2040 - 06/16/01 12:25 PM Re: How breaker works?
Tom Offline
Member

Registered: 01/01/01
Posts: 1069
Loc: 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.

Top
#2041 - 06/16/01 12:45 PM Re: How breaker works?
RICK 44 Offline
Junior Member

Registered: 06/08/01
Posts: 5
http://www.tpub.com/neets/book3/8i.htm
Mike
Look around in this site, think youll find more info than you want.

Top
#2042 - 06/17/01 09:05 AM Re: How breaker works?
Phil H Offline
Member

Registered: 04/14/01
Posts: 24
Loc: 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).]

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals