Breaker trip setting

[aap.angeles]

the question is, if I have a circuit breaker with the following setting 840A(AT) / 1200 A (AF), the data sheet indicates "80% rated", with the indicated setting of 840 A (AT) the circuit breaker will trip at 80% of the setting, that is, 672A, or at 100% of the setting, which is 840 A?

 

[ron]

The long time pickup settings gets set at 840A. It can accommodate 840A of non-continuous loads. 80% of 840A for continuous loads only.

 

[Jraef]

It will not TRIP at 80%, you are just not supposed to use it for more than 80% on continuous loads, continuous defined as 3 hours or more. If you do, the breaker may overheat.

 

[aap.angeles]

@ron @Jraef thank you very much, I have understood!

 

[GoldDigger]

It will not TRIP at 80%, you are just not supposed to use it for more than 80% on continuous loads, continuous defined as 3 hours or more. If you do, the breaker may overheat.

And, as a result, trip at some unspecified amount below the design trip point?

 

[Hv&Lv]

the question is, if I have a circuit breaker with the following setting 840A(AT) / 1200 A (AF), the data sheet indicates "80% rated", with the indicated setting of 840 A (AT) the circuit breaker will trip at 80% of the setting, that is, 672A, or at 100% of the setting, which is 840 A?

It shouldn’t trip at either value

for this breaker you can have 672A of continuous (or 100% non-continuous + 125% continuous) loads and satisfy NEC.
It’s for heat dissipation.
The pickup on the curve is 840A. According to the listing it shouldn’t trip at 840 either. It should start timing on the curve once it gets above 840A.