Patent ID: 7368676

Claim:
A switching device comprising a frame, in which an actuator and a spring means are installed, the actuator being adapted to rotate a main shaft of the switching device and being rotatable around an axis of rotation, the actuator having a 0 position, an I position and a first dead point between the 0 position and the I position, the I position being located by a given angle (α 6 ) in a first direction relative to the 0 position, and the spring means being comprised of one or more working springs each including a first end supported by the frame, and a second end, the spring means rotate the actuator, when the actuator is between the 0 position and the I position, towards the 0 position or the I position depending on which side of said first dead point the actuator is, wherein the actuator also has a testing position, the testing position being located by a predetermined angle (β 6 ) in a second direction relative to the 0 position, said second direction being opposite relative to said first direction.