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UltraFuse 13A Single

5 out of 5
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  • Replacement 13A mains plug fuse makes it easy to upgrade power cables

  • Features our unique Process Q™ treatment

  • Includes DeoxIT Gold® wipe for treating end caps before fitting

  • Supplied as a single fuse

Our best fuse ever - The UltraFuse™

With thousands sold since its development, we’ve been bowled over by the popularity and your positive feedback on the SuperFuse™. Driven by this success, we knew that through the development of the Process Q treatment we could make something even better.

The new process means that we are able to treat mains fuses with a far more sophisticated recipe than we use on our SuperFuses™, leading to greater performance.

And the result? UltraFuse™ - the best mains plug fuses we have heard.

UltraFuses are available as 13A, 10A and 5A mains plug fuses and are a straight swap for existing fuses. Unfortunately, our Cable Upgrade Scheme does not apply to fuses and existing SuperFuses cannot be upgraded to UltraFuses. UltraFuses are covered by our 60 Day Money Back Guarantee but, as a consumable, they are excluded from our 25 Year Lifetime Warranty.

The Russ Andrews 13A UltraFuse™ is a replacement mains plug fuse designed to be used with our power cables and cables from other manufacturers whose known cable rating is 13A. They must not be fitted to a mains cable that is rated lower than 13A e.g. 10A or 5A. They feature a specially-developed version of our unique Process Q. The UltraFuses are supplied with a DeoxIT® Gold wipe for treatment just before fitting.

Read our Guide to Choosing Fuses

What's included

One, Single 13A UltraFuse, DeoxIT Gold wipe, 'Fitted with UltraFuse' label, instructions, protective case.

Buying Guide


Russ Andrews specification 13A mains cable fuse
Treated with our unique Process Q™
Nickel plated copper end caps
Length: 25.4mm Diameter: 6.3mm
Ceramic body
Supplied with DeoxIT Gold wipe
Manufactured to BS 1362
Excluded from our Lifetime Warranty

Money Back Guarantee

Don't forget! We’re confident in the performance of this product that it is covered by our 60 Day Home Trial with Money Back Guarantee. Buy the product and if you're not completely satisfied, you can return it within 2 months for a refund. For full details click here.


"I can instantly perceive clear audible improvements in terms of fullness of sound and overall realism"

Read more about the Hi-Fi Choice review here

Customer Reviews
Overall product rating 5 / 5
5 / 5

reviewed by Y.G
13 Mar 2024
Yes, I recommend this product.
"5 Star Ultra Fuse"
I recently ordered 2 Ultra fuses. One was 5amp for my cd player, and a 13amp for my MF A5 Pwr amp. After trying it on my Arcam cd player, with fantastic results , I tried the other on my amp. It opened out the sound no end, with far greater soundstage, clarity and power. I completely forgot the time and was listening for ours. In near future I will be buying another 13amp Ultra fuse for my MF A5 Pre amp. The question I would like to ask Russ is do you think you can improve on the Ultra fuse?
5 / 5

reviewed by Ray Duggan
24 Dec 2023
Yes, I recommend this product.
"A Real Cost Effective Upgrade"
Now after 3 days I am now getting excited with both the Superfuse and Ultra fuse fitted, mainly in the midband where voices are focused bang in the centre of the stage with greater transparency than I have ever heard. Soundstage layering is better too with the voice being just slightly forward of my speakers but with good depth and width from the rest of the band. I am also happy with dynamics.....so in all a NO BRAINER.
5 / 5

reviewed by Ray Duggan
23 Dec 2023
Yes, I recommend this product.
"Ultra 13A Fuse"
After using the Deoxit gold on the end caps of the Ultra fuse, I installed the fuse but initially was disappointed with the result in sound although yes there was slightly more focus on individual instruments but something was not right. I ordered also an internal Superfuse for my AA drive CD transport, so upon fitting the SF everything changed better soundstage layering and prominence of instruments were improved and the sound was faster. I have also found that these fuses still need burning in the old fashion way in real time, also I have realised you need to replace both internal component fuses and plug fuses. I am already using mains conditioning from Puritan and Synergistic fuses elsewhere in my system.
5 / 5

reviewed by evan simpson
18 Aug 2023
Yes, I recommend this product.
"I Didnt Think It Would Be This Good"
As an electrician i knew the fuse is the last thing in the way of a good clean connection but reading the reviews i didnt think it would perfect y system as it did.. WOW! I added one ultrafuse at a time, one in my pc cable and one on my extension cord and it was an immediate jump (i listened to some songs carefully in headphones and on my speakers for comparisons). I noticed more space and more detail and timbre and accuracy and texture right away.

I then put one in my plug for my amplifier and noticed another 5% increase in space and detail (after listening before so). this cable however is a standard cheap cable but the one in my pc is audioquest £160 plug which created more of a focused sound and the fuses opened that up back to a perfect sound.

overall im very impressed and its worth it!
5 / 5

reviewed by John Waller
15 Nov 2022
Yes, I recommend this product.
"Yet Another Improvement"
I have recently bought a number of these fuses, which are installed into my Powerkord 100s. The background is quieter then ever, and, in my opinion, even more musical. I've decided to complete my upgrades with five more to be purchased.

One serious point, which I ignored when fitting my latest supply: I'm allergic to nickel, and whilst fitting them, I didn't protect my hands properly and had a painful reaction which lasted about sixty hours. RA, I'm no medical expert. However, perhaps you should highlight the potential allergic reaction on your website
4 / 5

reviewed by A.B
05 Nov 2022
Yes, I recommend this product.
"Ultrasonic Cleaner Sound"
Clearer cleaner wider and just a whole lot more from your system.
They sound incredible on the CD player using powekord 100 .
done the analogue set up as well and they have improved things there as well ,Though I've done the amplifier and again an improvement such a cheap &easy upgrade.......
Just try them .Used on a midrange system
5 / 5

reviewed by anonymous
19 Aug 2022
Yes, I recommend this product.
"Blown Away"
A friend suggested I get this, was expecting minor improvements perhaps just different.
What a bargain....every aspect is better, won't use the usual clichés...so I'm buy a load more
5 / 5

reviewed by Michael Pettett
20 Feb 2022
Yes, I recommend this product.
"Fantastico !"
I started with one Ultrafuse in the plug supplying my distribution block and it sounded as though I had upgraded my whole system, so I ordered two more to fit first to the cd transport and then secondly to my Devialet 220 .
With each fuse install there was an increase in sound quality, clarity and spaciousness.
And I thought my Devialet was the bee's knees before fitting the fuses.
Russ, you've done it again!
5 / 5

reviewed by Samuel Teremetz
20 Dec 2021
Yes, I recommend this product.
"So So Good"
I could have been sceptical and bought these online after a couple of glasses of wine. I bought two along with a box of shorties, so commenting on the application of two of these in one go. Added these to the two Kimber PowerKords I have feeding an Innuos Zen2 and a Devialet Expert 200, feeding some Sonus Faber Olympica 2s via Kimber 12TCs in biwired mode. Just so so good, everything is even more hollowgraphic, dynamic, cleaner and clear highs, detail and the bass is soooo much deeper, wider, dare I say flatulent on certain tracks in an amazing way..l just love it…and kind of want to keep going down the rabbit hole a little….Just effortless and so satisfying..
5 / 5

reviewed by Rafal
09 Dec 2021
Yes, I recommend this product.
"Stunning Little Bad Boys"
Bought 5 of them for all my power cords. They sound amazing straight out from the box . If you know the sound of your system very well it’s enough to know it works after the first track from your favourite playlist. I was afraid that they may add some brightness to the sound as they contain some silver , but it’s not the case at all. In fact they eliminated the last remained harshness . It’s a real icing on the hifi cake.
What improved ? - everything what was already great became stunning now. 3D effect, spaciousness of the sound, little details in the voice. Can’t wait to to hear them after a couple of weeks.
Also RA customer service, packing and the next day delivery, make me coming back for more. Thank you
5 / 5

reviewed by AndrewSJ
18 Oct 2021
Yes, I recommend this product.
"A Turbocharger For Your System"
Highly recommended - a simple way to upgrade your system for a relativity low cost. To echo the earlier reviewer, my friends would say, “£52 for a fuse, are you insane? To which I would reply, “No, the improvements are well worth the cost!”. I sat mesmerised by the fantastically musical and solid sound of “Los Pajaros Perdidos” (L’Arpegiatta) from my CD17KI, hearing details of the instruments, rhythm and timing that had bypassed me previously.
5 / 5

reviewed by John Holgreaves
13 Oct 2021
Yes, I recommend this product.
"If You Don'T Buy These You Are A Fool!!"
I have just had my Linn Exact upgraded to the latest spec. Now it is burned in it is sounding wonderful. I already have the Super Fuses and having been impressed with their increase in performance and having read the reviews on the Ultra Fuses, I would invest in the Ultra Fuses at £200.
Are you ready for this? Are you sure? You won't believe it!!

The increase in performance from the Ultra Fuses was far greater than the increase from the new Linn Klimax upgrade costing a five figure sum!!
5 / 5

reviewed by Kevin Cheeney
09 Sep 2021
Yes, I recommend this product.
"Ultra Fuses Are They Worth It ????"
I am not one for leaving feedback but in this case I feel I need to. Having read and reviewed lots of different manufacturers of so called hi-fi fuses Some of these can be well over £100. I then came across the Russ Andrews website and was quite surprised with the reviews of the fuses of both there super and ultra fuses. They also offer a 60 day money back guarantee, so with that in mind I decided To buy five of their ultra fuses. I have to say after just two weeks of listening I have found at the sound stage has much improved and also the instruments are clearer and more detailed. So do I think that these are worth the money…..Absolutely.... I would highly recommend these to anyone how wants to upgrade their current system but without putting a huge dent in the bank balance. And like I said earlier 60 day money back guarantee ( which I will not be using ) you can’t go wrong. Thank You Russ Andrews
5 / 5

reviewed by Sean Hipkiss
27 Jul 2021
Yes, I recommend this product.
"The Ultra Fuse You Can'T Do Without!"
After the purchase of 4 ultra fuses I was expecting something less than the seismic shift at the bass end, it's consequent dispersal creating a huge sound scape across the room. It had me thinking that Sonars album 'Vortex' never sounded this spacious the last time I played it. Each instrument fighting to be heard clearly and all of them were winning! Steve Khan's "Lets Call This" with Ron Carter's Bass, Al Fosters Drums and Steve's Khan's Guitar are given precision, timing & soaring clarity, and on that premise I give these brilliant fuses 5 stars - they really do make a difference, by a distance!
5 / 5

reviewed by Trevor Reeve
12 Jul 2021
Yes, I recommend this product.
In recent weeks have replaced nearly all superfuses with the ultra fuses in power cables feeding such things as powerbar,X block,power purifiers,AbZorbers and clarity mains.There has been a definite increase in dynamics,even more clarity and definition and an improvement in all aspects of the soundstage.
5 / 5

reviewed by Tom
21 May 2021
Yes, I recommend this product.
"Wow, Wow & Double Wow"
Who would pay £65 for a fuse? They must be idiots! For over 30 years I have been upgrading & enjoying my music system. Amps, CD players, cables, isolation, racks etc. & never ever given the stupid fuse a second thought. By chance I noticed the rave reviews of the super fuse followed by some of these people changing to the ultra fuse. Absolute madness, £25 is daft enough but £65 really, stupid idiots, its a fuse!
Well they give a 60 day money back promise so what's to lose? I bought 3 ultra fuses for my MBL preamp, McIntosh power amp & Luxman CD player, read the instructions on arrival and stuck them in. I have now ordered another 6 of them for my TV, home cinema amp, Sub speaker, Blu ray player and extension block. Why I hear you ask? I have spent a fortune over the years & nothing has changed the sound this good for so little money. Buy them, your not stupid after all!!
5 / 5

reviewed by S Haralambous
17 Apr 2021
Yes, I recommend this product.
"Not An Improvement..."
..but a totally different listening experience. I am Very familiar with the super fuses. the ultras are from a 'different planet'. A PowerKord on a Bose music system, from super to ultra. Oh my God.
5 / 5

reviewed by anonymous
11 Mar 2021
Yes, I recommend this product.
"A Little Gem"
I have fitted a handful of these to my mains cables, and I’m loving the added richness they have created.

The sound is more detailed, bringing about a compellingly transparent listening experience.

It’s clear, that the Ultrafuses have elevated the mains cables, to a significantly higher level of performance. A little gem, that makes a big difference.

5 / 5

reviewed by Nigel Sheepwash
17 Feb 2021
Yes, I recommend this product.
"Fantastic Leap In Performance"
WOW! Another product that lifts the musicality of my system. I already have super fuses through out and when i saw the new Ultrafuses i though id give one a try. After all there is the 60 day money back guarantee if i didnt like it. Well it wont be going back, and I'll be ordering more soon. Fantastic uplift in the sound that i wouldnt have believed was possible over the already good Superfuses.
5 / 5

reviewed by Pete Cable
17 Feb 2021
Yes, I recommend this product.
If I may I would like to add some further words to my earlier review. I've now received further Ultra Fuses and they are now installed in the rest of my system. If I was enthusiastic about the fuse I had fitted in the the Power Chord 100 feeding my cd player I am now almost lost for words trying to find ways to describe the effect these fuses have had on the sound emanating from my system. If there is no such thing as perfection then installing these little items are the nearest thing to it that I can think of. The cost is negligible compared to the enormous lift my system has had and I'm now just going to sit back and listen to music and not my hifi system. A complete no brainer and an essential purchase. Thank you Russ Andrews
5 / 5

reviewed by Pete Cable
01 Feb 2021
Yes, I recommend this product.
My system is fitted throughout with Super Fuses and I have been well pleased with their performance. However, when the new Ultra Fuse was announced I just had to give them a try. Exercising caution I purchased just one and on receipt eagerly replaced my Super Fuse with the Ultra Fuse in my Power Chord 100 feeding my Musical Fidelity M3scd player. To say that the result was astonishing would be an understatement. This was not a subtle improvement, it was a quantum leap forward. On the first day I spent hours playing many genres of music. In every case I found myself on the edge of my seat thrilling to the sounds emanating from my speakers. These fuses might seem expensive at £65 but when you get an upgrade like this I can only say they are the bargain of the century. I shall now be purchasing more fuses for the rest of my system. I can't wait to hear what that is going to do for my listening experience. Very strongly recommended.
5 / 5

reviewed by Stewart
29 Jan 2021
Yes, I recommend this product.
"Best Upgrade"
I had super fuses in my system which I thought were great so when the ultra fuses came out I replaced the super fuses and I have to say the ultra fuses are brilliant the sound from fuses in my power supply and to my rubicon 6c speakers is unbelievable increase in sound performance, I can only say buy these you won’t be disappointed
5 / 5

reviewed by Dr Russell McInnes
27 Jan 2021
Yes, I recommend this product.
"Ultra Fuse"
The fuel for your music system is the mains supply. All of this electricity has to pass through the fuse unless you choose to bypass it which is probably in advisable! I previously invested in a complete set of Russ Andrews super fuses. The Ultra fuse gives a huge improvement to all
aspects of the music! The improvements are not subtle! While £65 sounds like a lot for a fuse the improvements are an absolute bargain. Not only recommended but essential. I will be ordering another 9 for my system.