| 摘要 |
An isolation switch has at least one first cam attached to a blade of the isolation switch, the first cam arranged to rotate about a first axis. At least one second cam is arranged to rotate about a second axis. The first and second cams engage so that rotation of the second cam in a first rotational sense urges rotation of the first cam so as to engage the blade with a fixed contact, thereby closing the isolation switch. The first cam, when under the influence of electromagnetic forces resulting from current flow through the isolation switch tending to open the isolation switch, urges rotation of the second cam in the first rotational sense. The second cam is prevented from rotation in the first rotational sense beyond the predetermined angular position, where the predetermined angular position is chosen to permit the second cam to close the isolation switch, and prevention of rotation of the second cam locks the isolation switch closed, thereby preventing forces developed on the isolation switch under short circuit conditions from opening the isolation switch.
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