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#201258 - 05/23/11 07:05 AM Are US breakers typically thermal-magnetic?  
Texas_Ranger  Offline
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Joined: Dec 2001
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Vienna, Austria
Over on the German board the question arose, whether US breakers for residential use are typically equipped with both a thermal and an electromagnetic tripping device or only either of them.

In all countries that use DIN rail equipment they seem to alyways have both, is that true for the US too?


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#201259 - 05/23/11 08:47 AM Re: Are US breakers typically thermal-magnetic? [Re: Texas_Ranger]  
renosteinke  Offline
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Blue Collar Country
The statement is true for breakers found in the typical panel.

There are some breakers used in motor control centers that lack the magnetic function.


#201265 - 05/23/11 02:37 PM Re: Are US breakers typically thermal-magnetic? [Re: Texas_Ranger]  
Texas_Ranger  Offline
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Vienna, Austria
Thanks a lot! For motor controls, omitting the magnetic trip makes sense since the short-circuit protection can be achieved by a much larger fuse upstream.


#201325 - 05/28/11 05:32 AM Re: Are US breakers typically thermal-magnetic? [Re: Texas_Ranger]  
frenchelectrican  Offline
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Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
Originally Posted by Texas_Ranger
Over on the German board the question arose, whether US breakers for residential use are typically equipped with both a thermal and an electromagnetic tripping device or only either of them.

In all countries that use DIN rail equipment they seem to alyways have both, is that true for the US too?


It the same in France we have both thermal and magatic breakers as well but few of the breakers may not have magatic at all I know I have ran into hydrallic breaker { kinda oddball item }

Merci.
Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


#201326 - 05/28/11 07:36 AM Re: Are US breakers typically thermal-magnetic? [Re: Texas_Ranger]  
Texas_Ranger  Offline
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Joined: Dec 2001
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Vienna, Austria
The hydraulic surely wasn't the typical 10, 16 or 20A household type, was it?

I'm interested in what you'd typically find in an apartment or single family home, as that was what the original discussion was concerned with.


#201338 - 05/28/11 10:17 PM Re: Are US breakers typically thermal-magnetic? [Re: Texas_Ranger]  
harold endean  Offline
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Boonton, NJ
Reno,


Are we talking about FPE breakers? smile


#201342 - 05/28/11 10:27 PM Re: Are US breakers typically thermal-magnetic? [Re: Texas_Ranger]  
gfretwell  Online Content


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Joined: Jul 2004
Posts: 9,086
Estero,Fl,usa
This is a SqD QO GFCI I cut open to see what was inside.I was really interested in the GFCI part but you can see the breaker part too. It looks like it is thermal only.

[Linked Image]


Greg Fretwell

#201343 - 05/28/11 10:29 PM Re: Are US breakers typically thermal-magnetic? [Re: Texas_Ranger]  
renosteinke  Offline
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Harold, I cannot even attempt to explain the engineering miracle represented by FPE and their breakers.

Imagine ... a breaker that works so well in Canada that it's sold by Schneider Electric (alongside their competing Square D line), yet somehow fails to perform 'south of the border.'

Perhaps us hapless Yanks are simply not sophisticated enough to use these advanced devices laugh


#201348 - 05/28/11 10:53 PM Re: Are US breakers typically thermal-magnetic? [Re: Texas_Ranger]  
harold endean  Offline
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Joined: Feb 2002
Posts: 2,233
Boonton, NJ
Reno,

I believe the FPE breakers actually worked well with a thermal overload. It was those quick short circuit faults that they didn't seem to see.


#201410 - 05/31/11 12:48 PM Re: Are US breakers typically thermal-magnetic? [Re: renosteinke]  
JBD  Offline
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Joined: Jul 2001
Posts: 599
WI, USA
Originally Posted by renosteinke
There are some breakers used in motor control centers that lack the magnetic function.


Nope.

The "typical" breaker in a motor control center is Magnetic only. The thermal function is handled by the motor starter's overload relay.


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