Patent ID: 7432789

Claim:
An electromagnetic switching device, comprising: an electromagnetic drive apparatus; at least one electrical contact, the contact being movable via a contact link support from a disconnected position to a bridging position by the electromagnetic drive apparatus when a pull-in current is applied to the electromagnetic drive apparatus, the contact being closed in the bridging position and being open in the disconnected position; a basic appliance; and an additional appliance, connected to the basic appliance, the contact link support and the at least one contact being arranged in the basic appliance, the additional appliance including, an extension, connected to the contact link support in such a way that the extension is positively guided by the contact link support, the extension being mechanically blockable by use of a locking element, connectable to the additional appliance and blockable in the disconnected position of the contact, such that the extension, the contact link support and the contact are locked in the disconnected position, even when the pull-in current is applied to the electromagnetic drive apparatus.