Compatible with Scalextric START Sets, TURBO FLYERS set C1278 all Scalextric analog sets with a product code of C1290 and above. 
This is the standard 1.2 amp replacement for the original transformer in all Scalextric conventional (non-digital) race sets with newer 2013-on power bases (C8530 and C8531 and Start set power base) that accept only transformers with a rectangular plug.  It is not compatible with the earlier Sport power bases that accept a round controller plug, C8217 and C8241.
- Input 120VAC / Output 15VDC@1.2A 
- If your Scalextric analog power base has one wide flat jack in the center of the power base then it is compatible with the P9403 transformer (this one).
- If your Scalextric analog power base has a round power jacks and has a number under C1283 then you will need to use transformer 9203. 
- Not compatible with Scalextric Digital sets.
- For Scalextric Digital with one or two round plugs use the P9303 transformer.
Used with permission, copyright 2015 Hornby (Scalextric) Copyright 2015 Brey Corp. t/a Hobby Works