Are metal film resistors "fusible resistors"?

[Axtman]

Are metal film resistors also known as "fusible resistors"?

[TimFox]

About 35 years ago, we tried an experiment to see if low-resistance 1/4-watt carbon composition resistors (from Allen-Bradley) could be used as fuses to connect many circuit boards to a common power supply.
They just sat there for a long time and smoked away when dissipating power several times their rating.
We ended up using real "picofuses" (TM) with the same lead spacing (at higher cost) to get effective fusing.

[Gyro]

Carbon Composition resistors can survive (and are spec'd for) amazingly large peak power dissipations. Yes, they will smoke and eventually catch fire but that will be the first sign of distress! I carried out some extreme tests for a discharge probe to use with my repaired 10kV insulation tester and didn't even observe any changes of resistance value...

https://www.eevblog.com/forum/projects/resistor-extreme-pulse-overload-experiments/


@Axtman:  Flameproof fusible resistors with defined fusing characteristics are metal film, but that doesn't mean that all metal film resistors are fusible.

[Axtman]

I have a "junk box" full of 1K NOS resistors. How do I tell if I have a fusible resistor? Are there any special markings besides brown black red gold? (Of course I know what the carbon comp resistors look like.)

[amyk]

All non-organic substrate resistors are technically fusible (well, everything is fusible eventually)

Made me post this...

[Gyro]

I have a "junk box" full of 1K NOS resistors. How do I tell if I have a fusible resistor? Are there any special markings besides brown black red gold? (Of course I know what the carbon comp resistors look like.)

Fusible resistors usually have another band but this varies between manufacturers. The body colour also tends to be a redish 'cement' rather than the normal lacquer. Any background information to make you think they are fusible? The odds are that they are not. Post a photo...