| 摘要 |
<p>An operating mechanism of a multipole circuit breaker comprises a toggle associated with an automatic tripping hook and an operating handle cooperating with a pivoting locking lever arranged to block the handle in an intermediate position in case of welding of the contacts. When normal opening of the contacts takes place, the locking lever comprises a radiating bearing surface cooperating with a protuberance of the bar to keep holding the locking lever in the first active position of the stop, during a first part of the opening travel of the movable contact of each pole, and a notch for receiving said protuberance causing unblocking of the locking lever to release the base close to the end of opening travel of the movable contact.</p> |
