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JohnCiolino(at)carolina.r
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 Posted: Wed Jun 21, 2017 12:18 am Post subject: Fuselink vs. blade fuse |
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All,
I am confused over the difference between using a fuselink and a blade fuse. Bob's Z-11 diagram shows a fuselink on the wire between the buss bar and the master switch. The rest of the electrical circuits are protected by blade fuses, why not use a blade fuse here? From Bob's write up on circuit protection in the AeroElectric Connection a fuselink is just another form of circuit protection. Why not just use a blade fuse everywhere?
John Ciolino
Bearhawk Patrol builder
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Wed Jun 21, 2017 4:00 am Post subject: Re: Fuselink vs. blade fuse |
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That fuselink is part of the crowbar over-voltage circuit. Since the crowbar circuit is more likely (than any other circuit) to nuisance trip its over current device, a circuit breaker is used to make it easier to reset. In many aircraft the circuit breaker might be located quite some distance from the main power bus. That long wire needs to be protected on the source end; thus a fuselink. Why not use a fuse? Because a fuse is fast blowing. A fuse, even a much larger fuse, will blow quicker than a smaller circuit breaker in series with it.
I see no reason why the circuit breaker needs to be mounted on the down steam side of the master switch. Connect the circuit breaker directly to and close to the main power bus. Then no fuselink is needed.
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Wed Jun 21, 2017 4:24 am Post subject: Fuselink vs. blade fuse |
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| Quote: | | I see no reason why the circuit breaker needs to be mounted on the down steam side of the master switch. Connect the circuit breaker directly to and close to the main power bus. Then no fuselink is needed. |
Not so much 'down stream' as 'adjacent to'
that switch.
[img]cid:7.1.0.9.0.20170621071626.05cbfe68(at)aeroelectric.com.0[/img]
Fuse blocks are generally mounted out of sight,
out of mind. The necessity for a single breaker
to be part of the mix calls for extending the
bus to the switch location . . . hence protection
more robust than fuses, less robust than
breakers, i.e. fusible link.
Bob . . .
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