Patent ID: 7959474

Claim:
An electrical additional module, comprising: a device interface for fitting the electrical additional module on a service device to which the additional module may be attached, the service device having a graduated accommodating geometry with at least two steps and an electrical contact device for accommodating an opposing electrical contact device on the additional module is arranged on each of the at least two steps of the service device, the device interface including step sections which are formed so as to be complementary with respect to the at least two steps of the service device and on which, in each case, one of the opposing electrical contact devices is arranged for making contact with the associated electrical contact device, wherein in an unoccupied state of the electrical additional module, the at least two step sections are rigidly connected to one another; and guide apparatuses forming a module-side part of a sliding guide for sliding the additional electrical module onto the service device from an intermediate position as far as an end position along a sliding direction, at least one of parallel to a bearing region and perpendicular to a resting region, the guide apparatuses including at least one of a mechanical coding device and laterally integrally formed or attached cheeks with guide paths for accommodating device-side hook elements, the cheeks of the step sections having differently coded mechanical coding devices.