Patent ID: 6621389
Filing Date: 2003-09-16
Classification: H01H

Abstract:
An electrical switchgear unit comprising:a pair of separable contact means, comprising at least one movable contact means movable between a contact position and a separated position; an opening and closing mechanism of the switchgear, comprising: a primary member movable in a closing direction from a loaded position to a closed position passing via an intermediate closing dead point position, the movable contact means being in the separated position when the primary member is in the loaded position, an energy storage spring arranged in such a way that the primary member loads the storage spring when passing from the loaded position to the closing dead point position, and that the storage spring discharges driving the movable contact means to the contact position when the primary member passes beyond the closing dead point in the closing direction; an electric motor controlled by control means; an irreversible kinematic transmission system between the electric motor and the primary member, such that the electric motor can drive the primary member but the primary member can not drive the electric motor, the motor running in a closing direction to drive the primary member in the closing direction; wherein the control means comprise means for detecting passage of the primary member via an indexed intermediate stopping position between the loaded position and the closing dead point position and for stopping the motor when the motor drives the primary member in the closing direction and the primary member reaches the indexed stopping position.