Anyone who chooses the versatile modularproduct range on the basis of the i-system opts for a great deal of flexibility and functionality. And they are choosing one of three DELTA switch and socket outlet product ranges with great design. The advantage is that the functions can be fitted in any of the various frames. To change to a different DELTA range on the basis of the i-system, all you need to do is replace the frame. Upgrading or conversion at a later date is possible at any time. And it is backwards compatible as far back as 1973.