Hi,I would expect it to to be something like this.Group 1 are the taps on the primary winding. This allows for variation in the primary voltage to get the desired secondary voltage. You choose the pair most suited to the available voltage off the grid. The diagram shows the tapping point layout.Group 3 is the max rated primary current for the primary winding.Group 2 is the rated secondary voltage and current.Note that the full data sheets and usage/maintenance instructions are available from the companies web site, you should refer to them rather than getting information from this forum if your interest is for reasons other than the very general,cheers,Richard
