The generators, types SGT 215-12D and SGT 215-12Y replace the original generators of model 5506 205 and 5506 206 in complete volume of electric parameters and the mechanical measures.

The generator is intended for operating as a power supply to be used on railway carriages. It is a 3-phase claw-pole synchronous generator driven by a gear unit attached to the axle bearing by a flange. The three-phase current generated on the run by the generator in co-operation with regulator is used, after rectification, for supplying electrical appliances and for charging carriage accumulators.