Questions tagged [thermal-cutoff]

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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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) ...
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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:...
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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 ...
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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 ...
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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. ...
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981 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 ...
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6 votes
4 answers
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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 ...
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1 answer
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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 ...
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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 = ...
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2 votes
2 answers
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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 ...
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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 ...
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2 votes
1 answer
2k 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 ...
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2 answers
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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 ...
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5 votes
2 answers
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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.
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4 votes
2 answers
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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 ...
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