Low-voltage circuit breaker

A low-voltage circuit breaker comprising one or more electrical poles, each of said poles having an internal space with a contact area, and an arc extinguishing area, a fixed contact assembly and a movable contact assembly being positioned in said contact area, said movable contact assembly being movable between a closed position in which it is into contact with said fixed contact assembly and an open position in which it is spaced apart from said fixed contact assembly, an arc chamber comprising a plurality of substantially parallel arc-breaking plates made entirely of a ferromagnetic material being position in said arc extinguishing area, said arc chamber further comprises at least one arc-breaking plate which is at least partially made of a ceramic material and is substantially parallel to the plurality of arc-breaking plates made of the ferromagnetic material, said arc chamber further comprising at least one arc-breaking plate which is entirely made of the ceramic material.