Aircraft Circuit Breaker Rating and Design Margins 2

[kontiki99]

Anyone know of a good reference or specification for selection of aircraft circuit breaker type and recomendations for capacity safety margins.

FAA 4313 states the obvious, breaker has to be rated to trip below rated current capacity of wires or current requirement of load which ever is lowest.

I'm trying to figure out what typical safety factor should be. If I could find a reference on breaker types and considerations for intermittant load types that would be helpful too.



In theory, there is no difference between theory and practice; experience suggests that in practice, there is.

 

[thruthefence]

Here's an advisory circular with refs to the certification rules.

http://rgl.faa.gov/Regulatory_and_G...yCircular.nsf/list/AC 25-16/$FILE/ac25-16.pdf

 

[WKTaylor]

kontiki99..

SAE ARP1199 Selection, Application, and Inspection of Electric Overcurrent Protective Devices [replaces MIL-STD-1498 CIRCUIT BREAKERS, SELECTION AND USE OF]

Numerous circuit breaker specs SAE ASxxxx

Following may be useful...

SAE ARP4101/5 Aircraft Circuit Breaker and Fuse Arrangement

SAE TP 2006-01-2419 Arc Fault Protection, Application Techniques for Aircraft Circuit Breakers

MIL-HDBK-411 POWER AND THE ENVIRONMENT FOR SENSITIVE DoD ELECTRONIC EQUIPMENT

Regards, Wil Taylor

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[kontiki99]

Thank, both references have some interesting information. I'm sure there's more, but I'm at a loss for finding it.

In theory, there is no difference between theory and practice; experience suggests that in practice, there is.