KGSF 12 ... 36 (12 - 72,5 kV) Outdoor Combined Instrument Transformer with single-pole voltage transformer and current transformer part. The single-phase combination transformer combines one current and one voltage transformer in one housing. These RITZ KGSF combination transformers have been specially developed for outdoor use. They can be used for measuring and protection purposes, with a rated current of max. 1,500A (2-hole connection H), in the voltage series 12 to 72.5 kV.