Circuit breaker

A circuit breaker comprising:

• a housing defining an operating chamber and an arc extinguishing chamber;
• and
• a severing mechanism provided in the operating chamber and comprising a punch, the severing mechanism being configured to sever via the punch a conductor extending through the housing between the operating chamber and the arc extinguishing chamber;
• wherein the punch of the severing mechanism comprises a first punch and a second punch spaced apart from each other to define a groove therebetween, wherein the conductor is broken at a single severing point when the conductor extending through the housing is severed by the severing mechanism;
• wherein a baffle plate is provided within the arc extinguishing chamber, the baffle plate being aligned with the groove, and the baffle plate being configured to be inserted into the groove after the conductor is broken at the severing point, the baffle plate being inserted into a groove of the housing such that the baffle plate and the groove cooperate to define a tortuous creepage path that electrically isolates severed conductor sections and physically divides the arc extinguishing chamber into a first arc extinguishing chamber and a second arc extinguishing chamber;
• and
• wherein the circuit breaker further comprises:
• an arc extinguishing medium filled within the arc extinguishing chamber;
• and
• a gas flow guiding mechanism disposed around the arc extinguishing medium and configured to guide gas from the punch of the severing mechanism through the arc extinguishing medium when the conductor extending through the housing is severed by the severing mechanism, the gas flow guiding mechanism comprising a plurality of gas guiding cavities circumferentially surrounding the arc extinguishing medium to promote uniform gas diffusion around the medium.