| 摘要 |
A power limiting mechanism must be provided especially for protecting electrical-mechanical contactors from welding during power surge resulting from a short circuit. According to the invention, the power limiting mechanism (1) closes a short-circuiting contact (8) of a first short-circuiting branch circuit (9) to disconnect the contactor (20) during a first step and the short-circuiting function thereof is then carried out by an arc (25, 25') having a second short-circuiting branch circuit (19) in a second step. During the disconnection process, the arc is commuted by the short-circuiting contact (8) on the associated conducting bars (16, 18) and flows into an arcing chamber (17) of the power-limiting mechanism, whereby the short circuit is interrupted.
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