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kenryan
Joined: 20 Oct 2009
Posts: 424
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 Posted: Mon Feb 13, 2017 11:42 am Post subject: "slow blow" ? |
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The following statements appear in the (sometimes poorly translated) Rotax 914 installation manual:
"the rectifier-regulator has to be protected by a slow blowing 25A fuse..."
"Each of the two fuel pumps has to be protected by y slow blowing 5A fuse in accordance with wiring diagram..."
"The TCU (turbo control unit) has to be protected by a slow blowing 2A fuse in accordance with the wiring diagram..."
Do you guys think they actually mean to call for slow blow fuses (as opposed to "regular" auto fuses)? Aren't fuses already "slow blow" when compared to breakers? Or did I get that backwards?
Ken
"the rectifier-regulator has to be protected by a slow blowing 50A fuse or a circuit breaker"
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Mon Feb 13, 2017 12:44 pm Post subject: "slow blow" ? |
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Ken;
Fuses are generally "faster" than breakers. "Slow blow" fuses will hold greater overloads for longer before melting, thus the term "slow to blow". They will still usually be faster than an equivalent breaker. The greater the overload magnitude the faster the protective device opens in most all situations whether it be a fuse or a breaker.
Bob McC
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Bob McC
Falco #908
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nuckolls.bob(at)aeroelect
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| Posted: Mon Feb 13, 2017 6:34 pm Post subject: "slow blow" ? |
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At 01:37 PM 2/13/2017, you wrote:
| Quote: | The following statements appear in the (sometimes poorly translated) Rotax 914 installation manual:
"the rectifier-regulator has to be protected by a slow blowing 25A fuse..."
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Use MAX30 + inline holder
| Quote: | | "Each of the two fuel pumps has to be protected by y slow blowing 5A fuse in accordance with wiring diagram..." |
An ATC5 in fuseblock is probably just fine.
| Quote: | | "The TCU (turbo control unit) has to be protected by a slow blowing 2A fuse in accordance with the wiring diagram..." |
An ATC3 in the fuseblock is recommended.
| Quote: | | Do you guys think they actually mean to call for slow blow fuses (as opposed to "regular" auto fuses)? Aren't fuses already "slow blow" when compared to breakers? Or did I get that backwards? |
Compared to breakers, ALL fuses are faster than greased
lightning. Then too, 'slo-blo' fuses are a tiny fraction
of the fuse market and not available in our favorite
plastic package.
If you get nuisance trips, upsize the 'fast' fuse to
one step.
Bob . . .
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kenryan
Joined: 20 Oct 2009
Posts: 424
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| Posted: Mon Feb 13, 2017 7:13 pm Post subject: "slow blow" ? |
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Thanks Bob!
On Mon, Feb 13, 2017 at 4:56 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | At 01:37 PM 2/13/2017, you wrote:
| Quote: | The following statements appear in the (sometimes poorly translated) Rotax 914 installation manual:
"the rectifier-regulator has to be protected by a slow blowing 25A fuse..."
|
Use MAX30 + inline holder
| Quote: | | "Each of the two fuel pumps has to be protected by y slow blowing 5A fuse in accordance with wiring diagram..." |
An ATC5 in fuseblock is probably just fine.
| Quote: | | "The TCU (turbo control unit) has to be protected by a slow blowing 2A fuse in accordance with the wiring diagram..." |
An ATC3 in the fuseblock is recommended.
| Quote: | | Do you guys think they actually mean to call for slow blow fuses (as opposed to "regular" auto fuses)? Aren't fuses already "slow blow" when compared to breakers? Or did I get that backwards? |
Compared to breakers, ALL fuses are faster than greased
lightning. Then too, 'slo-blo' fuses are a tiny fraction
of the fuse market and not available in our favorite
plastic package.
If you get nuisance trips, upsize the 'fast' fuse to
one step.
Bob . . .
|
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