In many cases a mini and a standard blade type fuse will fit in the standard holder. If it fits you can use either. I just bought a standard holder and the package instructions indicated this also.
John
2008 Tiffin Allegro Bus 40' QSP
2006 Chevrolet Colorado Toad
BlueOx Aventa LX Tow Bar
SMI Air Force One toad brake
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ratfink09 wrote: Is there a difference? Want to replace the 30 amp fuse in my landing gear power line and I cannot get the reguler blade type fuse in the holder. Dealer said I could use a 30 amp mini fuse. Thanks!
Wow, must a an airplane, right?
Well, the types who would put pennies into a fuse box, or use a 22 long
rifle shell in a 1/4" fuse holder are the norm of the herd.
Think for anything that can fall out of the sky or can't land has a
different metric of safety requirements.
Get the right one spec'd out by your OEM for that fuse holder.
Yes, there are whole school books on fuse application engineering. You
*CAN* sub another, but then you must know enough about this re-engineering
to chose the right one.
Since landing gear, might there be a motor in this circuit?
If so, it has inductive characteristics that has special application
fuse requirements over a regular resistance load that normally is
seen in automotive.
Assume you are the pilot too, so remember the folks who gave you
advice will be nowhere to be found if you need them to check out what
they recommended while you are in the air...
-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...
Quote: Since landing gear, might there be a motor in this circuit?
If so, it has inductive characteristics that has special application
fuse requirements over a regular resistance load that normally is
seen in automotive.
The landing gear (hydraulic levelers) in my motorhome has a motor that drives the hydraulic pump. The slide-out rooms also have motors. Both use the same blade-type fuse as the rest of the circuits.
The purpose of fuses in distribution circuits is to protect the wiring. They are sized in accordance with the current-carrying capacity of the wires, not the characteristics of the load.
* This post was
last
edited 11/08/09 07:13pm by hwybnb *
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JUrban wrote: In many cases a mini and a standard blade type fuse will fit in the standard holder. If it fits you can use either. I just bought a standard holder and the package instructions indicated this also.
John
Interesting as Bussmann does not agree. I was concerned if the ATM would make adequate contact in an ATC holder. I E_Mailed Bussman with the question. Here is their reply.
"Hi John,
Yes, ATC fuse holder will not make enough contact when a ATM series fuse gets mounted to it and hence could not be offered.
The recommended fuse holder for the ATM series would be HHM series.
Kindly go through the attached data sheet link for the HHM series fuse holders.
For the motor application the ATC will work better as it has a slower melt time at higher currents than the ATM. Example with a 30 amp fuse at an impulse load of 200 amps the ATM will melt in 0.03 seconds and the ATC will melt in 0.106 seconds. Both will protect the wiring but the ATC less apt to blow when the Landing gear motor sees burs etc on the gearing.
JUrban wrote: In many cases a mini and a standard blade type fuse will fit in the standard holder. If it fits you can use either. I just bought a standard holder and the package instructions indicated this also.
John
Interesting as Bussmann does not agree. I was concerned if the ATM would make adequate contact in an ATC holder. I E_Mailed Bussman with the question. Here is their reply.
"Hi John,
Yes, ATC fuse holder will not make enough contact when a ATM series fuse gets mounted to it and hence could not be offered.
The recommended fuse holder for the ATM series would be HHM series.
Kindly go through the attached data sheet link for the HHM series fuse holders.
For the motor application the ATC will work better as it has a slower melt time at higher currents than the ATM. Example with a 30 amp fuse at an impulse load of 200 amps the ATM will melt in 0.03 seconds and the ATC will melt in 0.106 seconds. Both will protect the wiring but the ATC less apt to blow when the Landing gear motor sees burs etc on the gearing.
I wish I had saved the packaging now. I was skeptical when the auto supply counterman told me too, and I actually read the packaging before purchasing it. More than likely NOT a Bussmann, but that's what the package said.
The landing gear (hydraulic levelers) in my motorhome has a motor that drives the hydraulic pump. The slide-out rooms also have motors. Both use the same blade-type fuse as the rest of the circuits.
The purpose of fuses in distribution circuits is to protect the wiring. They are sized in accordance with the current-carrying capacity of the wires, not the characteristics of the load.
No kidding, really thought air plane, as I don't have a MH, nor much
experience with them. So their terminology is foreign to me...
You listed a 'motor', which is a highly inductive load and does require
different fusing than a resistive load.
No skin off my nose, but if the OP puts in regular fuses where a fuse
designed for inductive loads...it will blow much more often. Even
if you have a CB, but most CBs do have inductive characteristics, but
there are differences there too. Just not as severe as fuses.
Also, the smaller the motor, the less in rush there is, so resistive
type fuses 'might' work out and still protect the wiring.
The Bussmann answer didn't say it directly, but they are talking about
resistance load vs inductive load. If interested, google 'inductive',
'resistive', 'in rush' and 'fusing'. Read up. Basic electrical engineering 101 stuff.
My power jack ("landing gear") calls out a time delay 30A fuse. 3AG IIRC or something similar. These fuses are a very slow blow and will take an overload for a much longer time before blowing and won't blow with the inrush current a motor can draw.
Can you use a std mini 30A fuse? Probably, but you may end up with it either blowing occasionally on startup or when the motor loads down.
I'd go with the fuse and type the jack called out.
RCMAN48 wrote: Example with a 30 amp fuse at an impulse load of 200 amps the ATM will melt in 0.03 seconds and the ATC will melt in 0.106 seconds.
Good information, and I have to admire anyone that can read one of those time/current charts to 1/1000 of a second. I wonder though if the difference between 0.106 and 0.03 is significant from an operation standpoint. Both are classified as "fast" fuses.
* This post was
edited 11/09/09 09:42pm by hwybnb *
For goodness sake - fuses are NOT designed to blow under normal operation.
They are designed to fail under ABNORMAL operation and whether it takes 0.03 or 0.3 of a second, in the automotive environment it makes not the slightest difference.
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