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#7451 - 02/06/02 12:20 AM thermal trip settings on breakers  
menegt  Offline
Member
Joined: Jan 2002
Posts: 34
sacramento, ca
What is the rule of thumb in setting the trip settings and time delay trip on a breaker? Any help would be appreciated.


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#7452 - 02/06/02 09:39 AM Re: thermal trip settings on breakers  
JBD  Offline
Member
Joined: Jul 2001
Posts: 599
WI, USA
What type of breaker? Molded case with adjustable thermal-magnetics? Molded case with complete solid-state trip elements covering long, short and instantaneous trips? Air-frame power style with withstand ratings?

On large projects the trip settings are usually determined by some type of time-current coordination study.

On small projects the manufacturer usually has typical settings for solid-state trip elements that will mimic thermal-magnetic curves.



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