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Questions tagged [thermal-cutoff]

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Need suggestion to replace the thermal fuse of a heater

I got a mal-functioned heater from a community group. After diagnosis, I found one of the thermal fuse was blown. I got the replacement fuse and now face the question of how to replace it. The ...
Jack Hwang's user avatar
2 votes
1 answer
117 views

Determining values when designing with thermal fuses; calculating influence of location/proximity to heat source & properties of protective coverings

The root question: Are there any best practice rules or guidelines for spec'ing out a system with a non-resettable thermal fuse? What criteria is used to determine what rating fuse is needed? I'm ...
JCReardon's user avatar
0 votes
1 answer
700 views

Do letters matter on thermal fuses?

DIY oven repair question. I need to replace this thermal fuse: Does it matter what letters there are shown i.e. YCW.dz YCWRY, <...
T.Todua's user avatar
  • 101
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1 answer
60 views

Gate-source connected MOSFETs for voltage division

Currently, I am engaged in the design of a Thermal Shutdown circuit for an LDO regulator. In this endeavor, I have obtained a circuit schematic from a senior colleague, which utilizes three NMOS ...
Arnab Deb's user avatar
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1 answer
140 views

Using BS270 MOSFET as Temperature Sensor

I have previously asked a question about using thermocouples to maintain a temperature range of 36-39° inside an insulated and dry environment. The more enlightened engineers advised I look into using ...
Aaron Butkovich's user avatar
2 votes
2 answers
258 views

I need to make a makeshift thermocouple given limited resources in the third world

I'm living in a part of the world where scrap electronics are hard to come by. Recycling these are big money in the impoverished SEA region I'm living in. I have a Fluke 289 with a type K thermocouple ...
Aaron Butkovich's user avatar
0 votes
3 answers
596 views

What could be causing my wire terminals to burn off so often? [closed]

Every 3 to 8 months, my 20-year-old dryer stops producing heat. It started happening about 4 years ago. To repair it, I replace either a thermostat or a thermal fuse. Often, the wire is charred at the ...
user148298's user avatar
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0 answers
66 views

How to remove this thermal cutout from a circuit?

I'm trying to replace a thermal cutout in a convection heater. I'm kind of new in this world, and only have some rudimentary knowledge of soldering and circuits. I found this connection, and it's the ...
Ivotje50's user avatar
  • 101
2 votes
2 answers
465 views

High voltage power thermal fuse for DC

I am looking for ways to break a high voltage DC power line when an overheating scenario occurs. Preferably I would like to do so using a thermal fuse but can’t find any thermal fuses rated for high ...
LukasL's user avatar
  • 128
1 vote
1 answer
2k views

Does the color band on a thermal fuse indicate temperature?

I have a thermal fuse that is blown (open circuit.) Any textual markings it might have had are worn away, but I'm wondering if the yellow color on the one end is significant. In looking for possible ...
Dave H.'s user avatar
  • 510
1 vote
1 answer
234 views

Does the thermostat cause arcing?

I am planning use to resettable thermostat switch in my circuit. I will use it to turn off the optocoupler input. With 5 volt, current is 5-10 mA in optocoupler LED. But I'm worried that an electric ...
johny adv's user avatar
2 votes
2 answers
4k views

Name of this crimp connector?

What is the name of this crimp connector? It looks like a spade connector (female) with a missing tail. In the picture, it used to attach a thermal fuse. Does it require a special tool to install? Can ...
Jet Blue's user avatar
  • 1,143
0 votes
2 answers
626 views

Thermal Resistance, PCB Operating Temperature and PCB Self Heating

I want to understand a few terms. My Questions : What does Maximum PCB operating Temperature for a PCB in general depend upon? Maximum PCB Operating temperature depends on Tg (Glass Transition ...
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0 answers
143 views

Thermal cutoff for a high current mains application

I'm designing an inrush current limiter for a large rack which will under normal conditions draw ~25 A at 230 VAC. I'd like to be able to trip the current carrying live wire if the temperature in my ...
Sean's user avatar
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1 vote
0 answers
64 views

Thermal Faliure of thermal overload protected ICs

I have encountered a number of instances now where ICs that supposedly include "thermal overload protection" will still heat up until they fry. Examples: LM338,LM2576. These devices datasheets ...
Brandon Hill's user avatar
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3 answers
817 views

Can a resettable thermal fuse be soldered?

Earlier related questions: How to solder a 70 °C (158 °F) thermofuse Using a thermal fuse in a PCB terminal block? History: I 'normally' soldered a nonresettable thermal fuse, which (of course) ...
Michel Keijzers's user avatar
2 votes
1 answer
610 views

Using a thermal fuse in a PCB terminal block?

(This is related to question How to solder a 70 °C (158 °F) thermofuse). Would it be a good idea to use a temperature/thermal fuse inside a terminal block like the picture below. I see only benefits:...
Michel Keijzers's user avatar
0 votes
1 answer
55 views

Do thermal cutoffs exist that would work with a line that is 40-75V 0.5A and a max temp of ~85°C?

I have a bunch of COB LEDs that I am going to wire in series using an LED driver. The driver gives off between 40-75V and 0.5A max. The circuit should run around 70V and 0.5A. Due to space ...
Ethan's user avatar
  • 25
1 vote
2 answers
275 views

Constant Power Micro Load

I am trying to make a circuit that slowly discharges a multi cell lithium battery to storage voltage. I already have a comparator circuit that can turn on or off discharging. I want to support 2s to ...
Y. Shrestha's user avatar
0 votes
2 answers
470 views

Thermal runaway protection

I'm having an oven that is heating a specific element. I have cascaded P/PI loops. I have two thermo elements as sensors. I would like to know how would I implement a thermal runaway protection. ...
Andre Ahmed's user avatar
0 votes
2 answers
1k views

Using motor circuit breaker buttons to start/stop motor

I want to add some protection to an ac 3/4 hp motor. I did some research and found that I could use one of these motor circuit breakers: My question is, if I use one of these, can I use the on/off ...
user135908's user avatar
6 votes
4 answers
1k views

Why not include a thermal fuse in electrical outlets?

I have found myself reading reports of fires lately, including some that started due to high-resistance connections in electrical outlets and switches. A load on a high-resistance connection can ...
Stephen Collings's user avatar
1 vote
1 answer
832 views

LM1117-3,3 keeps using more and more current

In the process of fault finding a circuit I am building using an ESP8266, I think I found the problem may be with my LM1117-3,3. The circuit starts off fine drawing between 80 (off state) and 160 (on ...
Gineer's user avatar
  • 456
0 votes
2 answers
1k views

Does using "High Leg Delta" 3-phase electricity require a different equation for calculating Amperage/Power?

The basic equation I've been using to calculate the amount of Amperage required to achieve a particular power output using 3-phase electricity is: Amp. = Watts / (√3 × PF × Voltage) where PF = ...
Steamericas's user avatar
2 votes
2 answers
1k views

Thermally protecting a varistor

I am designing a circuit that has a nominal 24VAC input. This circuit is protected by a 4A Fast-Acting fuse. I would also like to insert a transient voltage surge protection. For achieving that, I am ...
gstorto's user avatar
  • 679
0 votes
1 answer
803 views

Circuit or component to detect temperature change

I know this is a very simple question but I didn't find the answer. I have very less knowledge in electrical. I want a component or a circuit or whatever, which I can attach to a heating coil so that ...
user34570's user avatar
2 votes
1 answer
3k views

Options for a simple over-temperature cut-off?

I am designing a heater circuit that will be used in a product to be produced in small to medium quantities (hundreds to thousands of units, not tens of thousands). This heater will be PWM controlled ...
Matt B's user avatar
  • 165
7 votes
2 answers
2k views

Why do we assume VGS<Vth and Vds>0 for a mosfet in cuttoff and Vce>0 for a BJT in cutoff?

The devices below are both n polarity devices, the BJT is a NPN and the MOSFET is a NMOS. For the BJT in cut-off, why do we have to assume \$V_{ce}>0\$? For the MOSFET in cut-off, why do we have ...
pyler's user avatar
  • 377
5 votes
2 answers
181 views

Thermal relief style X or +?

Are there any differences between a thermal relief in a 'X' shape for a '+' shape? I am using Altium and the software has both styles for selection.
mFeinstein's user avatar
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5 votes
2 answers
3k views

Do Thermal Cutoff switches exist for temperatures below 50 C?

I have been trying to find some passive thermal cutoff switches for a project, but it seems that all of them are for 65 degrees C and up. Is there another name for lower temperature TCOs? Any help ...
Xantham's user avatar
  • 151