What is this resistor?

[wadmancpu]

Am I crazy or isn't this a 2,000 ohm resistor? Also isn't this ceramic? I can't seem to find these either. Thanks all.

[schmitt trigger]

This looks very similar to fusible resistors found as in-rush limiters in high power supplies.

Low power supplies can use a thermistor as an inrush limiter, but even at its lowered resistance can create high losses.
Therefore a high power supply usually employs a fixed resistor that is fully shorted out by a relay after a set time.

However...if for whatever reason the relay contact's do not close, the resistor will become cherry-hot and could actually cause a fire.

Thus, these types of resistors have a thermal cutout which will permanently open if the resistor's maximum temperature is exceeded.

Having said this, for a more accurate answer, would you kindly tell us the circuit you remove this resistor from?

[Yansi]

wirewound R2 = 0.2ohm,  K=10% tolerance.

Salvaged from an audio amp, guessing.

[Yansi]

This looks very similar to fusible resistors found as in-rush limiters in high power supplies.

Low power supplies can use a thermistor as an inrush limiter, but even at its lowered resistance can create high losses.
Therefore a high power supply usually employs a fixed resistor that is fully shorted out by a relay after a set time.

However...if for whatever reason the relay contact's do not close, the resistor will become cherry-hot and could actually cause a fire.

Thus, these types of resistors have a thermal cutout which will permanently open if the resistor's maximum temperature is exceeded.

Having said this, for a more accurate answer, would you kindly tell us the circuit you remove this resistor from?

Resistors with thermal cutout look different.¨Thermal cutout would be explicitly stated on it. I think this one is a bog standard wirewound 0.2ohm one. Fusible resistors are also very different kind.

This is how resistor with thermal cutout looks like:

[wadmancpu]

This out of a tv power supply. Thank you for the specs on this. It was testing shorted and I thought 2k would be 2,000 ohms. I see now .2 ohms why it tests the way it does. Does anyone have a link that shows what these numbers and letters indicate?

[Yansi]

R is the standard character for OHM, while K is standard identificator for 10% tolerance.



These letters are also used extensively on other passives such as foil capacitors.  J, K and M being the most often seen.

//EDIT: More on the markings here: http://www.iequalscdvdt.com/Markings_and_Codes.html

//EDIT2: On my photo of resistors with thermal cutout, you can see the letter J used to identify +-5% tolerance of those 10 ohms.

[wadmancpu]

Excellent, thank you!

[schmitt trigger]

Thanks for the clarification.