| 摘要 |
A switching device comprising a frame (2), in which an actuator (6) adapted to rotate a main shaft of the switching device and rotatable around an axis (12) of rotation, and spring means are installed, the actuator (6) having a 0 position, an 1 position and a first dead point between the 0 position and the 1 position, the 1 position being located by a given angle (.alpha.6) in a first direction relative to the 0 position. The actuator (6) also has a testing position, the testing position being located by a predetermined angle (.beta.6) in a second direction relative to the 0 position, said second direction being opposite relative to said first direction.
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