Guys,
On an AC isolator, it is physically possible to have the input and output of each pole in the same plane - the contacts separate in a 180degree plane away from each other. With a true DC disconnector, especially the IMO products, the contacts are intentionally designed to rotate/slide apart (or together) to minimise arc formation and to allow self-cleaning. These functions of the design are intentional as part of the unit's ability to manage load breaking DC current and to maximise the life-expectancy of the product.
If you look closely at the contact block/base, you will see that each pole (1-2, 3-4, 5-6 & 7-8) is actually stepped from each other - to facilitate this rotational knife-edge contact design.
Anyone using a contact block that has straight pass-through of contacts is more than likely looking at an AC contact block, not DC....
As for space inside the enclosures, this is a common observation, especially when running 2 strings through a 4-pole unit, and especially when running 6mm2 wire. However, IMO have listened to the marketplace and all new products being manufactured and supplied since the last couple of weeks now have the new, longer enclosures giving more working room inside and around the terminals.
Hope this helps,
Andy
