Author Topic: Is this a resistor  (Read 1480 times)

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Offline fixit7Topic starter

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Is this a resistor
« on: June 13, 2019, 01:34:34 am »


This is marked

TF 185 degrees C

10A

BX X20

Is it some kind of heavy duty resistor or fuse?
« Last Edit: June 13, 2019, 01:36:26 am by fixit7 »
 

Offline cur8xgo

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Re: Is this a resistor
« Reply #1 on: June 13, 2019, 01:36:19 am »
This is marked

TF 185 degrees C

10A

BX X20

Is it some kind of heavy duty resistor or fuse?

TF  = "thermal fuse" ?

185C = trip temp?

10A  = max rated current

BX X20 = part number?

 
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Online oPossum

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Re: Is this a resistor
« Reply #2 on: June 13, 2019, 01:36:49 am »
Thermal switch. Probably goes open at 185C.
 

Offline MosherIV

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Re: Is this a resistor
« Reply #3 on: June 13, 2019, 06:52:16 am »
No it is not a resistor.

It is a thermal fuse, as others have suggested.
 

Online Zero999

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Re: Is this a resistor
« Reply #4 on: June 13, 2019, 08:38:44 am »
Thermal switch. Probably goes open at 185C.
Being picky but it's not a thermal switch, because that implies it's resettable. A thermal fuse is a one shot device: once it's blown, it'll need replacing. Thermal switches are also often used for thermal protection, but they're normally combined with a thermal fuse, just in case the contacts weld closed.

Thermal fuses are normally used for fire protection. Quite often the device will be irreparable before the thermal fuse blows, but not always, so it might be worth replacing. Try temporally replacing it with a wire and if the device works, including the temperature controller (it's very common for a temperature controller to fail with the heater stuck on, causing the thermal fuse to blow), seek a replacement. Obviously don't permanently replace it with a wire, because that would result in a huge fire risk.
 

Offline Psi

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Re: Is this a resistor
« Reply #5 on: June 13, 2019, 08:49:29 am »
Soldering/desoldering them can be tricky, they tend to blow if you get to close with the iron.
Greek letter 'Psi' (not Pounds per Square Inch)
 

Offline Brumby

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Re: Is this a resistor
« Reply #6 on: June 13, 2019, 11:31:34 am »
Definitely a thermal fuse.

Soldering/desoldering them can be tricky, they tend to blow if you get to close with the iron.
Which explains why it looks like it's secured by nut and bolt.
 

Offline fixit7Topic starter

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Re: Is this a resistor
« Reply #7 on: June 13, 2019, 04:42:36 pm »
I wonder what the yellow wrapper is?
 

Online Gyro

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Re: Is this a resistor
« Reply #8 on: June 13, 2019, 05:09:36 pm »
Kapton tape for insulation.
Best Regards, Chris
 
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Offline fixit7Topic starter

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