A passivated metal structure and a method of forming the metal structure is disclosed. A rigid compartment divider is pivotally coupled to the floor of the storage compartment between a first substantially horizontal storage position and a second substantially vertical dividing position. The drive circuit is further configured to switch off the first subgroup at the end of a first time period and switch off the second subgroup at a time instant before the end of the first time period. In accord with the invention, when in a holding position of the magnetic armature the smallest possible gap exists between the magnet armature and the magnet core.