| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit breaker having an arc-extinguishing mechanism that improves the arc-extinguishing performance and reduces the manufacturing cost. SOLUTION: An arc-extinguishing mechanism for a circuit breaker 20 includes an ablative device 50 arranged within a chamber 44. An end of the ablative device 50 includes an opening that receives a stationary contact 22. A movable contact arm 26 travels within a groove from a closed position to an open position. Upon detection of any faulty operating condition, the circuit breaker 20 trips causing the movable contact arm 26 to move. This generates a plasma arc that evaporates a material from the ablative device 50. The evaporated material generates a pressurized gas that cools and extinguishes the plasma arc. COPYRIGHT: (C)2010,JPO&INPIT |
