Patent ID: 6977567

Claim:
A low-voltage circuit breaker with a capability of tripping quickly, having a housing with a bottom part, a base part and a casing, comprising: one-pole or multi-pole contact device with an arc-extinguishing grid chamber disposed therein, contact heads installed in the arc-extinguishing chamber adapted to be separated by the electrically operated repulsion force generated when an electrical current exceeds a certain value to limit the current; an operating mechanism that can disconnect and close the contact heads, a heat energy and electromagnetic tripper that can drive the operating mechanism when an overloading and/or short-circuit occurs; and a rotating shaft; wherein at least one side face of the contact device provides an open flange that is connected to a chamber where high-pressure gas is produced and stored; and the rotating shaft is disposed on the bottom part; the rotating shaft containing stressed members arranged correspondingly to the open flange and an activating member that is adapted to activate a tripping device of the operating mechanism to make a trip with the rotating force passed on by the stressed members.