Inline Fuses - temp cutoff feature?

[MisterSandals]

I was testing my battery discharge to get a feel for its performance and cell behavior.
While running 66amps @13v from battery to inverter, my 100amp inline fuse would get hot and "cut out". I say "cut out" because the breaker lever didn't move as i would expect if it "tripped". But the test button got mushy until it cooled and then clicked back on all by itself (lever never moved).

Is this normal? I thought the breaker failed at first. My inverter and meter "flickered" a couple times and then power was cut.

No documentation (grrr). But the ad says:
Work Temperature: -10℃ to 50℃ (-14F to 122F).

This seemed to be its expected (intended?) behavior. Over the course of 4 hours of discharging, this happened about every 10-15 minutes. I could not detect any negative side effects or degradation in how the breaker functioned. I tested the breaker "test" button and reset lever quite a few times and all seemed normal (consistent anyway).

I was not expecting high performance or reliability from these breakers (using for testing only) but I have to say I am a little bit impressed with the heat cutoff. Its easier to get to the 50℃ level than I had hoped obviously.

Amazon.com

300A shunt and meter to gather the data.
4x 206AH LiFePO4 cells (at 12v obviously)
Giandel 1200w Pure Sine Wave Inverter powering 740w space heater

 

[grizzzman]

A whole lot of that type of circuit breaker are a lie. I had one that was rated 300 amps. It was tripping at around 50 to 60 amps. You could by putting a volt meter to either side of the breaker to see how bad the voltage drop is. (Causing the heat)

 

[Justin Laureltec]

Eesh... this is definitely not the intended behavior, but then again it doesn't surprise me - this type of thing (these failures come in many variations) is why I always strongly recommend using name-brand Bussman breakers and fuses in systems, because they actually perform to spec. I've personally seen over a dozen installations that have failed -in one way or another- due to using off-brand breakers and fuses, and spoken to victims of such failures in many more instances than that.