Transformer used in some brands and models, such as: SV, SVT, S3, S5, C210, G23. Can also be used for smaller models. BUT NOTE this transformer must be used now with the only replacement relay we sell for all our vacuums. The #242 Relay must be used with the #232 Transformer. To wire correctly see the diagrams in #242 relay and note that you need to choose either the white or red or orange wire (white is for 110-120 volt units, Red is for 208 volt, and Orange is for 240 volt - these instructions are on a sticker on the top of the transformer).