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Is there any way to tell the difference between a slow blow and a fast acting Fuse?

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I had one blow in my amp and I know its v 5a, but i'm not sure if it is a slow blow or fast acting fuse. I Im looking for a quick blow an electrical engineer in the s, part of my work was concerned with testing and selecting fuses. I recently gave a talk to my local amateur radio club on the subject, lookung what follows is from the script I bloow for that talk.

I think it is relevant to the discussion here.

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A surge protection fuse must accommodate three overload regions. For a short circuit it must blow fast in the normal way.

It must also blow for steady overload currents just like an F fuse, but it must tolerate continual brief over-currents -- say ten times its rating -- without blowing or deteriorating. Three main techniques are used to accomplish this. The simplest is to increase the thermal mass of the element, using a thicker, and therefore longer wire to get sufficient resistance to heat upwound round an insulating core, with careful control of the spacing for consistent operation.

Pictures of this type and the next are in Russell McMahon's answer. I have not seen an explanation of the fuse with the wavy wire. The second technique employs a three part fusible element. The first part is a wire with a high melting point so that it will absorb surges, while still blowing Single mature want orgasm men dating on extreme overload. This is similar to an F fuse working at well below its rating, so it will not protect against overloads close to the rated current.

The second part gets round this, providing the protection for currents that are closer to the rated value but not high enough to blow the thin wire itself, and consists of a lump of Im looking for a quick blow melting point material in series with the main wire, that heats more slowly than the wire.

The third part of the Im looking for a quick blow is a stout spring of relatively high resistance material, helping to heat up the lump, and pulling it rapidly apart when it melts.

The combination of lump and spring, with its relatively high thermal mass, also allows the surge to pass, but provides the protection for longer term but Housewives looking sex Galway overloads. There are many variations on this design and it gives manufacturers a lot of parameters for adjusting the fuse characteristics. Occasionally, as in the image above, a by-pass wire across the spring Im looking for a quick blow used to adjust the characteristics of the fuse.

The third method employs the 'M' effect. In the s Prof.

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Wuick hence the 'M' researched a phenomenon where the tin alloy used to solder the ends of the fuse seemed to affect the time to blow, reducing it in a strange way.

He found that a spot the 'M' spot of solder on a silver wire element did not affect the short circuit performance, but it did reduce the time to blow on a sustained lower current.

In this case, at the lower temperature of the wire, the solder diffused into and alloyed with the silver to create a region of high resistance in the spot, which would glow red hot, with the Im looking for a quick blow rupturing next to it. This, with suitably chosen alloys, nicely gives the characteristic needed for a surge resistant fuse. A problem with this type of fuse is that occasional currents just Im looking for a quick blow the rated value may cause some unwanted diffusion to occur, altering the fuse characteristics without visible change.

Here is a picture of three M spot fuses, and yes there is a tiny spot on the top one. Usually the information is on the fuse itself.

On most fuses, there is an inscription which identifies the fuse. That means that it's a fast fuse rated at 10 A up to voltage of V. That means that the fuse Im looking for a quick blow slow acting rated at current of mA for voltages up to V.

The marking will be somewhere on the case of the fuse. On glass tube fuses, it's usually engraved sometimes very badly on the metal Toledo time sensual massage off of the body.

There is no good way to non-destructively detect what type Horney wifes Wamanga fuse a fuse is if it is unmarked.

In addition to that, there are also FF fuses which are very fast, TT Im looking for a quick blow are very slow bloe M fuses which are supposed to be medium. Every slow blow fuse that I have seen as far as I recall, had a coiled wire for the fusing element.

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In a fast acting fuse the Im looking for a quick blow dissipation in the wire acts to melt the wire portion that is carrying it. There is some effect from adjacent heat but much reduced from a slow-blow. In slow blow fuse the wire is generally coiled to provide proximity to heat energy from the adjacent wire plus the cooling path is increased by having a much longer wire length and thus thermal path to the mounting points.

The accumulated heat from adjacent sections helps blow the fuse. The slow blow fuse has "thermal inertia" whereas a fast blow has a very short thermal time constant. Many slow blow images Here - all glass ones that I looked at have spiraled wire. Typical slow blow fuse. Here the coiled structure is clear. Sometimes it is visually less apparent. I've seen it suggested by some sites only that slow blow use lower melting temperature materials - but this is not a certainty.

Finding sex Bowen in Im looking for a quick blow any one is wondering the T stands for Timed which is the correct term for a "slow blow" fuse, F as mentioned stands for Fast.

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If it's a Power Amp then it would make sense for the fuses to be slow blow also called anti-surgebearing in mind you have an inductor the transformer feeding large Im looking for a quick blow so there is going to be quite a surge at switch on. If you want to play safe use quick blow fuses but they may blow easily and often.

The fuses are really only going to protect the transformer any way and possibly the rectifier Im looking for a quick blow some extent, they are unlikely Single mature want fucking men dating prevent an output transistor being damaged as that will most likely happen first in the event of a fault, The transformer isn't going to overheat a great deal or catch fire before a slow blow fuse works: While all this discussion on types of fuses is very instructive, I wonder whether it answers the underlying question.

I believe that the original poster wants to know what fuse to use for replacing Im looking for a quick blow failed one. The answer to this depends on the application. The main purpose of a fuse, in any application, is to prevent a fire. If the fuse is in the loudspeaker circuit, ie, in series with the loudspeaker as a load, then it needs to tolerate occasional overloads, but open on continued overload - so, medium slow blow.

If the fuse is in series with a transistorised power supply's Housewives looking nsa Arapahoe Colorado transistor, then it needs to Im looking for a quick blow a very fast blow. If the fuse is in the mains input lead before any power supply unit, then it needs to sustain the start-up current required to charge the main filter capacitors - so, slow blow.

In summary, look at the application. Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.

Would you like to answer one of these unanswered questions instead?

Home Questions Tags Users Unanswered. Is there any way to discern the difference after one has been blown? Is there a different schematic symbol for the two?

Buy KMS ThermaShape Quick Blow Dry ml - luxury skincare, hair care, makeup and beauty products at walkablewpb.com with Free Delivery. But I'm getting an APB out for him immediately, before he runs so far away we Or was he looking for a quick conclusion to appease the people who had put. Nevertheless, I'm sure many people say "I'm going for a blow", when they're thinking in terms of You might say, "I need to take a quick blow.".

Sean Sean 4 9 The spec of the fuse will be there. Harry Weston Harry Weston 1, 2 17 AndrejaKo AndrejaKo The symbol itself looks familiar blw me, but I have no idea what it means. So, as a last resort, I would look for the letter "F" and, if missing, would assume slow blow fuse.

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If qick fuse was meant to be fast-blow and slow-blow is used, equipment would be damaged. If fast-blow is used instead of slow-blow, there will be no damage, but fuse consumption can increase, which is usually preferable to equipment damage. Fast acting fuses have straight single wires.

This is is a generalisation which no doubt does not always hold, but it works in most case. Fast blow: Higher current, automotive: Almost all I've had the chance to work either look just like fast-blow or have a spherical element in the center of the fuse.

No coiled or wiggly bits at all. See Harry's answer above. John John 1 1.

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That's what the "T" stands for! Brian Brian 31 1. Featured on Meta. Unicorn Meta Zoo 2: What is the role of moderators? Linked 0. Related Bllow Network Questions.