The UC family is a group of diverter switch on-load tap-changers. They come in a wide range of models with a rating suitable for every application. They are mounted inside of the transformer tank, suspended from the transformer cover. The UC types operate with conventional arc quenching in oil diverter switches.
The UCL model is the mid-size of the UC types and is suitable for transformers up to 850 MVA with a BIL rating of 1175 kV and current rating of 925 (2400) A.