>1. The W31 breakers are not now specified in reguards to shock
>tripping. The old spec. used to be 15 to 25 G's. The low Amp. breakers
>up to about 4 Amps were good for 15 G's, above 4 Amps were good for 25
>G's. Rapping on your hand is not a valid test.
>2. From date code 9550 to present should be returned to your supplier
>for replacement!!!! There is a manufacturing defect that has, as of
>today, not been corrected. When the breakers trip, they can NOT be
>reset. Breakers made before date code 9550 should be OK.
For what it's worth, circuit breaker switches have very little
practical use in an airplane . . . some builders are thinking
that it makes life simpler because it eliminates the need for
both breaker and switch . . . but keep in mind that breakers
are by definition fed by bus bars. Therefore, you now have
to build a bus bar on the left side just to handle switched
circuits and another bus bar just for breakers where the circuits
have no switches. This is one of the driving factors for
the Fuse Block/Switch Panel architecture we've been writing
about. Your bus bars are purchased already made. ALL circuits
leading from the fuse block are protected and require no special
treatment whether they go to a switch or to some other device
not requiring a switch . . . . I wish Aircraft Spruce and
others would get those breaker-switches out of their
catalog. Buyer beware . . . just because someone sells it
doesn't mean they even know if it's a good idea or not . .
Bob . . .
AeroElectric Connection
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