| 摘要 |
The power breaker is provided with at least one arcing chamber (2) which is filled with SF6 gas, is rotationally symmetrical, and extends along a longitudinal axis (3). The arcing chamber (2) has a power current path with a central contact pin (14), and has a separate rated current path provided with rated current contacts (11). The arcing chamber (2) is operated by a drive linkage (4) which moves the contact pin (14) and the rated current contacts (11). The drive linkage (4) is designed such that, at the start of the disconnection process, the contact pin (14) remains in a first dead point position until the rated current path is interrupted. The contact pin (14) can then be moved in the disconnection direction at a considerably higher speed than the rated current contacts (11). Toward the end of their disconnection travel, the rated current contacts (11) run into a second dead point position. The contact pin (14) does not reach its disconnected position until after the rated current contacts (11) have ended their disconnection movement. At the start of the connection process, the rated current contacts (11) remain in this second dead point position until the pre-arcing of the switch-on arc has taken place. The rated current contacts (11) are in this way advantageously protected against damage caused by an arc.
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