Does thermal fuse have to stay inside windings full

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Does thermal fuse have to stay inside windings full

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But lawyers who handle personal injury or an Elmiron lawsuit are interested in protecting people from injury. In those cases, the thermal fuse is just doing the job it was designed for. They disconnect the flow of current to the heating element in case of malfunction such as a defective thermostat or clogged dryer vent that allows the temperature to rise to dangerous levels, possibly starting a fire.

Small appliance style thermal fuse Unlike electrical fuses or circuit breakers, thermal fuses only react to excessive temperature, not excessive current, unless the excessive current is high enough to cause the thermal fuse itself to heat up to the trigger temperature.

One exception to this generality is most Whirlpool — built gas dryers. The good news is, these thermal devices are one of the easiest components in the dryer to test. To test one, leave it in the dryer, power the dryer down, bypass the thermal device, and power up and run the dryer with it bypassed or jumpered.

Please, please note this is only to be done temporarily to test the thermal. Here are several common dryer thermal fuses. Resist the temptation to leave it bypassed and not replace it. So how do I locate my thermal fuse, you ask? Well, that depends on which brand dryer you own. Can be bypassed to test just like the others, though. Here are the two most popular thermal cutouts used in Whirlpool-built dryers.

Easy to get to: use a putty knife in its top edge to release the bottom front panel, and swing the panel down. I often have to use long-nosed pliers to reach my alligator-clip jumper down in there to jumper these. Tight spot. The good news is, to get to this one you only have to pull the dryer out a short distance so the top has room to swing upward. No need to access anything in the back. Speed Queen and Amana: Removing two screws at the bottom front of these cabinets allow the front to swing out, then the top clips to unhook.Latest Projects Education.

General Electronics Chat Why thermal fuse? JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Why thermal fuse? Thread starter ryancousins Start date Jun 3, Search Forums New Posts. Thread Starter ryancousins Joined Jul 15, I have a "Kill-A-Watt" power meter and I blew the thermal cutoff fuse because I drew too much current.

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I'm wondering, why not use a regular fuse? The only thing I can think of is that the manufacturer wanted to guarantee that it would trip if it got too hot inside the meter, even if you didn't exceed the 15A max current rating. What am I missing?

does thermal fuse have to stay inside windings full

It has the standard prongs built in, but maybe they considered that someone might find a way to plug it into and thereby upping the VA and therefore heat dissipation without getting near 15A? Also, would a thermistor be a suitable or even superior replacement for the thermal fuse? Scroll to continue with content. Usually they are used where the concern is over heating.

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Like a dryer or space heater. Doesn't seem like that would be an issue with the kill a watt. But maybe the concern is you plug it in and leave it and then there is an overcurrent that might "fire up" the kill a watt. Trying to find my mind reading hat That alone would stop a lot of people from repairing the device, then they would have to buy another one. Still not getting any answers to how a thermistor would work in that circuit.

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Do you have a schematic? I plan on ordering a replacement thermal fuse, ya, it's the kind you have to solder in.

My question was just general curiosity about why a circuit designer would use a thermal fuse instead of a current fuse when it's the current that's doing the heating anyhow. As far as the thermistor, I know very little about them beyond their Wikipedia article, which says they are often used as over-current devices in circuits.

Just curious, again. I'm not planning on replacing the fuse w one. The thermistors I use for thermometers and thermostats wouldn't have any useful role in a Kill-a-Watt, but there are some that change their resistance a lot in a small difference of temperature.

I think, "Poly-fuse" is one of them.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. Can I use the higher current rated thermal fuse? A motor can overload in many ways, but a stuck rotor for whatever reason needs to have a fuse that blows fast based on extreme over current. So the current rating of the fuse does matter in this case.

A motor can 'slow cook' due to an overload based on cracked or dry bearings or an over voltage condition. Not enough over current to pop the fuse but over time the motor windings become hot enough to burn the enamel coating and now you risk having a shorted motor. This is where a thermal fuse can sense a dangerous situation and open up based on extreme heat-not current. Normally a motor is on a circuit being fed by a breaker panel, but tripping a breaker is a last resort, as they can only trip OFF so many times before the contacts wear out.

Be smart and take the time to find the right thermal fuse. Contact the motors manufacture and search fuse manufactures for something much closer to the original fuse. What made the original fuse open in the first place? Check the motor out real good or it may have a problem that will blow the next fuse right away. A 2 ampere fuse cannot safely be replaced by a 15 ampere fuse irregardless of the type of fuse. You don't say the type of equipment using this fuse.

What do you think would happen if a fault in the equipment caused it to draw, for example, 10 amperes? The specified 2 ampere fuse would blow rather quickly. The 15 ampere fuse would never blow but your equipment could either be destroyed or worse start a fire.

Don't take a chance. Get the correct fuse. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.

does thermal fuse have to stay inside windings full

Can a thermal fuse of a higher rated current be used safely? Ask Question. Asked 1 year, 10 months ago. Active 1 year, 10 months ago. Viewed 2k times.

Since it is a thermal fuse, I would expect only the temperature to matterA thermal fuse is a small device - just an inch or two long - that plays a critical role in preventing fires. Federal law mandates the inclusion of a thermal fuse on all dryers manufactured since the s. A thermal fuse operates if dryer exhaust temperatures climb too high. The fuse shuts off the dryer or its components if this happens. A thermal fuse only works one time. If it triggers during a high-exhaust temperature event, the fuse must be replaced.

Many dryers simply will not run once a thermal fuse triggers. On other models, the drum continues to turn and the dryer operates, but the heating element does not.

Clothes come out of the dryer wet once the appliance completes its drying cycle. Manufacturers are not consistent from model to model, even within the same brand. Typically, you must remove the back panel of a dryer to access the fuse. Ensure to shut off electrical power to the dryer before attempting to locate and troubleshoot the fuse.

Most dryers plug into a volt wall outlet, so you can unplug the unit to cut off power. Thermal fuse shapes and sizes vary.

Some are made from plastic; others are metal. Look for a small device about the size of a quarter to about 2 inches long, mounted directly on top of the exhaust duct. A thermal fuse has two wires connected to it. A reliable method for testing whether a thermal fuse has burned out is to temporarily bypass the device.

However, it is tempting to operate the dryer this way, or forget to replace the fuse once the dryer is running. Bypassing the fuse is only a quick means of detecting whether the fuse is bad.Log in or Sign up. MIG Welding Forum. As afavour to someone I have been railroaded into having a look at at someones Butters AMT which is dead to the world apart from : The fan is going round and the overheating light is on. As the thing is freezing coldI reckon the thermal trip in the transformer has got to be the place to start looking.

There are lots of big wires going into the transformer and then 2 little ones, that might be the place to look, with my meter on the 2 little wires it's showing open circuit, odd. I tried substituting the probably bust thermal trip with a wire link between the 2 little wires andhooray the machine has woken up.

Ok, so now I want to replace the blown thermal trip with an auto resetting thermal fuse stuck to the outside on the iron core of the transformer, which should be an adequate repair. Opinions anybody. Oh, and thanks in advance. Is that C or F?

If it's C it sounds high to me, I think with the fan running the inside might be cooked before the outside gets that hot. What's the value of the original one? EllbatchMay 29, Minimum transformers insulation is for c core, that is in the core of the windings. Problem you have is relating that to a new location. You could temp short the sensor and run whilst monitoring temp with a thermocouple, on a few locations, to build a model of how the heat effects the surface.

They select a thermal fuse above that, nearest available value. Location is critical, not directly in the fan air flow, but tracking what happens to winding temperature. Also be useful to understand what events occurred when the original thermal fuse blown. The original is buried deep inside the windings of the transformerso is inaccessible.

If it was mine I would model the temperature rise and make a choicebut this is a quick and dirty repair on a farm welder.

How Do Fuses Work In Appliances? - Repair and Replace

Thanks for your opinions. Messages: 5, Location: bristol england. I'm very grateful for this advice, reason and evidence can lead you to a conclusionbut other peoples experienceand ideas are very valuablethanks again all of you. Greg Davies likes this. Messages: 4, uk Bristol. If you are worried about getting the right spot to mount it then you could always put two or three in series dotted around the transformer.

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does thermal fuse have to stay inside windings full

Author Topic: Is a thermal fuse a current fuse as well? Read times. Lupin III. Contributor Posts: I have a heating cushion that has a blown thermal fuse in the control circuit. My guess, someone "reset" the 90 minute heating limit done by a microcontroller by cycling the power all the time. At my local electronics shop they got either a 1A or a 10A version. Can I use the 10A version or is a fuse like that doubling as a current fuse as well?

Check to see that there is a second current limiting fuse in the unit, if so fit the 10A unit. Be careful soldering the replacement. I heard of someone replacing one in a pedestal fan, the soldered in 2 before they realised they were killing them by soldering. They needed to be crimped. No do not use a 10A in the place of a 2A fuse.

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If you do something like this, the whole point of having that 2A fuse is lost, and the circuitry is no longer protected in the way it was designed to be. Most of the thermal fuses that I have encountered have not been single use, and are usually resetable PTC style. You could just put a piece of wire in it's place, but that is a terrible idea, this is how you burn your house down.

Quote from: Pseudobyte on August 08,pm.

How to Test a Thermal Fuse

The following users thanked this post: Pseudobyte. Quote from: drussell on August 08,pm. Kjelt Super Contributor Posts: Country:. Quote from: wraper on August 08,pm. Zero Super Contributor Posts: Country: If a home appliance suddenly stops working, the first thing you should do is check if the thermal fuse is broken.

You should always test the thermal fuse first before you go and purchase a new one. A thermal fuse is a safety mechanism inside the home appliance; it obstructs the flow of electric power in the case of overheating. It should take only a few minutes to test a thermal fuse.

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First of all, you need to disconnect the home appliance from the electric power supply. You can do this by removing the plug. Make sure that the home appliance has no supply of electricity before you start testing the thermal fuse. Look for the thermal fuse located within your home appliance.

Not all thermal fuses are located in the same part of the appliance. It may differ from one brand to another, and it may also vary depending on what type of home appliance you have.

Generally speaking, the thermal fuse can be found in two locations: behind the rear panel or behind the bottom toe panel. Use a screwdriver to remove the panel so that you can have access to the thermal fuse behind.

If the thermal fuse is located behind the rear panel, remove the screws with the screwdriver.

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On the other hand, if the fuse is located somewhere in the front, use the screwdriver to press the metal clips and remove the panel. Put the panel aside when it comes loose, and leave it there until you have done all the testing and repairs necessary. The thermal fuse is a white strip of plastic, and it has two wires attached to itself. You need to remove these two wires.

You need either an ohmmeter or a digital multimeter in order to test the thermal fuse. You have to adjust your ohmmeter to the Rx1 setting. If you are not familiar with an ohmmeter, this is a device that helps you check whether the thermal fuse is letting electricity flow into the system of your appliance or not.

Allow the probes of your ohmmeter or digital multimeter to touch the ends of the fuse. The device should display a reading on the screen.

Read that carefully, and it will help you determine if the fuse is broken or not. On the other hand, you need to install a new thermal fuse if the needle of the ohmmeter does not move. Keep in mind that a thermal fuse cannot be adjusted, and if it is found to be faulty or broken, you need to replace it immediately. We welcome your comments and suggestions. All information is provided "AS IS. All rights reserved.


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