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Questions tagged [thermal-cutoff]

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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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0answers
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Substitutability of thermal fuse

I have had this SW-104T thermal fuse blow on me. I'm not in a situation where I can obtain an the exact replacement, so I am wondering about the substitutability of thermal fuses. If I match the ...
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3answers
209 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) ...
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1answer
175 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:...
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1answer
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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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2answers
144 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 ...
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2answers
205 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. ...
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2answers
587 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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4answers
561 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 ...
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1answer
430 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 ...
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2answers
677 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 = ...
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2answers
936 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 ...
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1answer
656 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 ...
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1answer
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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2answers
912 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 ...
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2answers
114 views

Thermal relief style X or +?

Is it there any differences between a thermal relief in a 'X' shape for a '+' shape? I am using Altium and the software has boths styles for selection.
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2answers
2k 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 ...