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thermal trip settings on breakers #7451
02/05/02 11:20 PM
02/05/02 11:20 PM
M
menegt  Offline OP
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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Re: thermal trip settings on breakers #7452
02/06/02 08:39 AM
02/06/02 08:39 AM
J
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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