A switching device operable between different set-points comprising: a rotary control handle adapted to switch between set-points; a sliding element adapted for protraction from a resting position to an elevated position to lock the control handle at any set-point and retraction from the elevated position to the resting position to unlock the control handle, said protraction defines an opening capable of receiving one or more padlocks in the locked position; a locking member that includes a shaft and a recess, said shaft can move in response to the protraction and retraction of the sliding element and respectively displaced into and out of the recess so as to cause the control handle to be correspondingly locked and unlocked; and means for enabling the protraction of the sliding element once the shaft is disposed within the recess by keeping the shaft stationary, characterized in that the means for enabling the protraction of the sliding element once the shaft is disposed within the recess comprises: an operating mechanism interacting, at one side, with the shaft and, at the other side, with the sliding element to provide a dual state of motion conversion and dwelling, wherein the operating mechanism comprises: a member that includes an oblong opening at one side and a bent opening at the opposite side, said member is mounted so as to rotate about an axle formed at the control handle, and wherein the shaft and the sliding element are each mounted to the member so as to slide respectively along the oblong opening and the bent opening of the member. a rotary control handle adapted to switch between set-points; a sliding element adapted for protraction from a resting position to an elevated position to lock the control handle at any set-point and retraction from the elevated position to the resting position to unlock the control handle, said protraction defines an opening capable of receiving one or more padlocks in the locked position; a locking member that includes a shaft and a recess, said shaft can move in response to the protraction and retraction of the sliding element and respectively displaced into and out of the recess so as to cause the control handle to be correspondingly locked and unlocked; and means for enabling the protraction of the sliding element once the shaft is disposed within the recess by keeping the shaft stationary, characterized in that the means for enabling the protraction of the sliding element once the shaft is disposed within the recess comprises: an operating mechanism interacting, at one side, with the shaft and, at the other side, with the sliding element to provide a dual state of motion conversion and dwelling, wherein the operating mechanism comprises: a member that includes an oblong opening at one side and a bent opening at the opposite side, said member is mounted so as to rotate about an axle formed at the control handle, and wherein the shaft and the sliding element are each mounted to the member so as to slide respectively along the oblong opening and the bent opening of the member. an operating mechanism interacting, at one side, with the shaft and, at the other side, with the sliding element to provide a dual state of motion conversion and dwelling, wherein the operating mechanism comprises: a member that includes an oblong opening at one side and a bent opening at the opposite side, said member is mounted so as to rotate about an axle formed at the control handle, and wherein the shaft and the sliding element are each mounted to the member so as to slide respectively along the oblong opening and the bent opening of the member. a member that includes an oblong opening at one side and a bent opening at the opposite side, said member is mounted so as to rotate about an axle formed at the control handle, and wherein the shaft and the sliding element are each mounted to the member so as to slide respectively along the oblong opening and the bent opening of the member.