[MPSimmons]

e-fuses (https://en.wikipedia.org/wiki/EFuse) are typically etched into the silicon as an exactly-once operation, meant to irrevocably set a configuration. Some devices, for instance, have an e-fuse that makes it impossible to change cryptographic trust signatures after the e-fuse has been blown.

[sabareesh]

That's intriguing; one might assume that a key feature of eFuse would be the ability to reset easily. But I guess it could be implemented without it

[bri3d]

There are two kinds of thing that are both called eFuse: current-limiting devices which are almost always resettable, and one-time programmed bits which are intentionally one-time programmable (some are implemented as physical fuses which are blown by overcurrent, others are implemented using various other types of write-once nonvolatile memory, and some bad ones are implemented by making normal flash pretend to be write-once using firmware-level protections).

Professionally I usually see OTP referred to as "fuses," "OTP," "straps," or "chicken bits," with the specific word "eFuse" reserved for the current-limiting device. But in popular media the trend seems the opposite.

[wmf]

No, the essence of a fuse is that it can never be reset. A circuit breaker is different.

[ChrisClark]

Why would that be the assumption? An eFuse is a literal trace that gets burnt up, you can't connect it back again.