amperage circuit breaker 110v 60Hz

[AlexisSIG]

Hey guys,
I am a mechanical technician intern in a french society (I am French too). I must export an installation with UL standards in US but I know nothing in standards in this country. In france, we choose the circuit breaker with the diameter of the cable. Could someone tell me which one can I buy if the diameter is 2,5mm² ?
Thanks.

[Zero999]

Don't you mean you normally choose the breaker to match the cable's current rating?

The cross-sectional area is only one property which determines the cable's current rating: the ambient temperature, maximum temperature rating of the insulation and whether it's in a bundle of other wires or wrapped in thermal insulation also play a part.

The circuit breaker's trip current needs to be less than the current rating of the cable. There are also other things which need to be considered such as the temperature rating, surge capability and maximum prospective short circuit current, which needs to be below the breaking capacity. The impedance of the cable also needs to be low enough to ensure the circuit breaker reliably trips.