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rparigoris
Joined: 24 Nov 2009
Posts: 780
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 Posted: Fri Sep 18, 2020 11:01 am Post subject: Need small physical size fuse 1/2 amp |
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Hi Group I need to wire several LEDs and small relays. I want to use small wire to do so and would like to steal some electron flow from some near by sources which are fused well above rating of small wire. Thus I want to install fuses. What are some options for small physical size fuses? At moment I'm thinking something I can solder and shrink wrap onto the wire? Thx. Ron P.
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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ceengland7(at)gmail.com
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| Posted: Fri Sep 18, 2020 5:32 pm Post subject: Need small physical size fuse 1/2 amp |
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On 9/18/2020 7:09 PM, user9253 wrote:
glass fuse yourself. But glass fuses are, in my experience, less than
reliable devices, especially in the lower amp values.
Here are some options that don't 'package' as well, but might be more
reliable.
https://en.wikipedia.org/wiki/Fuse_(automotive)
Lots of other options, depending on how much you're willing to pay.
https://www.mouser.com/Circuit-Protection/Fuses/Fuses-with-Leads-Through-Hole/_/N-ba8hh?P=1yocc0pZ1yzshdi
Charlie
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nuckolls.bob(at)aeroelect
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| Posted: Sat Sep 19, 2020 1:07 am Post subject: Need small physical size fuse 1/2 amp |
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At 02:01 PM 9/18/2020, you wrote:
| Quote: | --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com>
Hi Group I need to wire several LEDs and small relays. I want to use small wire to do so and would like to steal some electron flow from some near by sources which are fused well above rating of small wire. Thus I want to install fuses. What are some options for small physical size fuses? At moment I'm thinking something I can solder and shrink wrap onto the wire? Thx. Ron P.
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How many 'feeders' at what current levels?
Bob . . .
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rparigoris
Joined: 24 Nov 2009
Posts: 780
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| Posted: Sat Sep 19, 2020 10:54 am Post subject: Re: Need small physical size fuse 1/2 amp |
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Hi Bob
2 LEDs and 1 mini relay
1 LED needs power from always hot bus about 4 feet away from LED, there's another wire within inches
1 LED about 4 feet away from main bus, other power sources within inches
mini relay needs power from a specific wire that's passing right by the relay
The LEDs and mini relay are very low power, for robustness of wire will use 20 or 22, 1/2 or 1 amp should be fine.
Ron P.
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ceengland7(at)gmail.com
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| Posted: Sat Sep 19, 2020 2:13 pm Post subject: Need small physical size fuse 1/2 amp |
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On Sat, Sep 19, 2020 at 2:01 PM rparigoris <rparigor(at)hotmail.com (rparigor(at)hotmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "rparigoris" <rparigor(at)hotmail.com (rparigor(at)hotmail.com)>
Hi Bob
2 LEDs and 1 mini relay
1 LED needs power from always hot bus about 4 feet away from LED, there's another wire within inches
1 LED about 4 feet away from main bus, other power sources within inches
mini relay needs power from a specific wire that's passing right by the relay
The LEDs and mini relay are very low power, for robustness of wire will use 20 or 22, 1/2 or 1 amp should be fine.
Ron P. |
With a few inches of feeder, I'd probably just hook them up to the closest power feeder with same-gauge wire, if available sources are on when the LED or relay needs to be on. With inches of wire in each case, the weight would be barely measurable. Only thing that might give me pause is if the selected power source fed a flight-critical component, and with reasonable wire routing, there'd be little risk, regardless. If an indicator LED shorts, it should 'self fuse' (burn open) almost instantly, if it's current limit resistor allows it. The current limit resistor could be at the power tap, if it uses a separate resistor.I suspect that a mini relay coil would self fuse, as well, but that's a little less certain. You might well be able to use a series resistor at the source as a current limiter for the relay coil, as well.
Charlie
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