A method for evaluating mechanical performance of a switchgear device having at least one pole which includes a pair of contacts movable between open and closed positions, a support arm of a first contact, a support arm drive including a rotary pole shaft and a rod pivotably coupling the drive to the support, an energy storage system for moving the arm to close the contacts, and a toggle device with a trip latch, the method including measuring the angle of rotation of the pole shaft during contact closing, deriving specific values by measuring the angle of rotation, comparing the values with an initial reference value, identifying wear performances of the drive by comparing the specific values with the reference value, determining first and second specific values on a variation curve of the angle of rotation, calculating the angular difference between maximum and final angles of rotation; and identifying a latching state of the toggle device as a function of the angular difference.