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Can a low voltage situation cause a fuse to blow?

 
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ceengland7(at)gmail.com
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PostPosted: Tue Jun 26, 2018 5:24 am    Post subject: Can a low voltage situation cause a fuse to blow? Reply with quote

'Switcher' power supply. 

On Tue, Jun 26, 2018 at 8:11 AM, Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:
Quote:
--> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)>

I have a radio that requires 7.5A breakers on a 28v supply, and 10A breakers on a 12V supply. If the voltage drops the supply current requirement rises.

On Jun 26, 2018, at 09:02, Eric M. Jones <emjones(at)charter.net (emjones(at)charter.net)> wrote:

--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net (emjones(at)charter.net)>

First of all, low voltage IN GENERAL does not cause a fuse to blow. Look at all the cars with dead batteries for an example. Fuses are never even investigated.

Two phenomena contribute to the notion: 1) Back EMF, which reduces the running current when the motor comes up to speed, and 2) Starter circuits for motors which draw large currents UNTIL the motor gets up to speed. I won't go into the details, but they are similar, and both have to do with motor starting circuits.

I might add a third (rare) one: electronic circuits that try to keep an output constant. Usually these circuits have enough smarts to not blow an input fuse.

For circuits that only power resistive loads, fuse-blowing at low voltage is never an issue.

--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net




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alec(at)alecmyers.com
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PostPosted: Tue Jun 26, 2018 5:47 am    Post subject: Can a low voltage situation cause a fuse to blow? Reply with quote

no doubt. but the results stand.

On Jun 26, 2018, at 09:23, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
'Switcher' power supply.

On Tue, Jun 26, 2018 at 8:11 AM, Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:
Quote:
--> AeroElectric-List message posted by: Alec Myers <alec(at)alecmyers.com (alec(at)alecmyers.com)>

I have a radio that requires 7.5A breakers on a 28v supply, and 10A breakers on a 12V supply. If the voltage drops the supply current requirement rises.

On Jun 26, 2018, at 09:02, Eric M. Jones <emjones(at)charter.net (emjones(at)charter.net)> wrote:

--> AeroElectric-List message posted by: "Eric M. Jones" <emjones(at)charter.net (emjones(at)charter.net)>

First of all, low voltage IN GENERAL does not cause a fuse to blow. Look at all the cars with dead batteries for an example. Fuses are never even investigated.

Two phenomena contribute to the notion: 1) Back EMF, which reduces the running current when the motor comes up to speed, and 2) Starter circuits for motors which draw large currents UNTIL the motor gets up to speed. I won't go into the details, but they are similar, and both have to do with motor starting circuits.

I might add a third (rare) one: electronic circuits that try to keep an output constant. Usually these circuits have enough smarts to not blow an input fuse.

For circuits that only power resistive loads, fuse-blowing at low voltage is never an issue.

--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=481213#481213











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====================================





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