Author Topic: Correct fuse replacement  (Read 1567 times)

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Offline HansManTopic starter

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Correct fuse replacement
« on: October 24, 2018, 08:37:15 am »
Hello EEVblog Electronics Community Forum!

I have problem finding correct replacement fuse because i haven`t encountered that kind of fuse before.



I believe this is HRC Fuse ? How to choose replacement? There is no amperage rating, only power and resistance. This is SMPS , 220v ac to 12v dc, 2A output.
 

Offline capt bullshot

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Re: Correct fuse replacement
« Reply #1 on: October 24, 2018, 09:07:04 am »
That's an wirewound resistor, not a fuse.
Maybe it has some kind of fusible rating.
An arbitrary example (not checked if it is a proper replacement for your resistor): https://www.mouser.de/datasheet/2/427/acxxcs-1103032.pdf
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Offline Whales

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Re: Correct fuse replacement
« Reply #2 on: October 24, 2018, 09:56:03 am »
5 ohm 2W ceramic wire-wound  resistor.  Not a fuse.

You don't want a fuse with this much thermal mass, your wires would burn before the fuse would.

Offline sleemanj

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Re: Correct fuse replacement
« Reply #3 on: October 24, 2018, 12:31:12 pm »
fusible resistor, yes they are made in this style, primarily for fusing against a direct short across mains I think, while not fusing for transient high voltages.  The fusing characteristic would be determined by the power rating I expect, but I'm not familiar.  Compare a non-fusible of the same specs could be significantly overloaded and get hot enough to ignite things (you can easily overload a 5w wire wound resistor to such a point that the wire is visible glowing red hot).  In other words, fusible resistors are supposed to fail in a safe manner, standard ones however may fail in undesirable ways.
« Last Edit: October 24, 2018, 12:33:23 pm by sleemanj »
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Offline Neilm

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Re: Correct fuse replacement
« Reply #4 on: October 24, 2018, 06:46:47 pm »
That is a fusible resistor. They can be a bit hard to find - generally they are used as anti-surge devices in power supplies. I have used one to limit the charging of the supply caps. It was rated to allow the capacitors to charge, but blow if the caps took to much charge (for instance if the voltage didn't rise correctly)
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Offline ArthurDent

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Re: Correct fuse replacement
« Reply #5 on: October 25, 2018, 01:58:27 am »
I'm not sure where you'd have to look in your area but in the U.S. on eBay they can be found. Some have leads like this one which should still work in your circuit. Reading the listing may also help to give you some info.

https://www.ebay.com/itm/1X-5J2R0-2-ohm-5-watt-cement-fusible-resistor-will-replace-RGDU5M-5E-1-8-OHM-/142032672375
 

Offline Whales

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Re: Correct fuse replacement
« Reply #6 on: October 25, 2018, 07:20:42 am »
Wow, OK  :o  Apologies.


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