HeschenUniversal Rotary Cam Selector Changeover Switch SZW26-20/D303.3D 660V 20A 3 Position 3 Phase 12 Terminals CE with Master Switch Exterior Box LW28-20/4,TUV(Standard Box)

Nice and big back box so good if you are using heavy cable

Ok

Others have criticised the compact nature of the box, I seem to remember one reviewer saying they were forced to mount the switch in a different box.There is no doubt the switch is a snug fit and requires careful dressing of the wires so they fold back neatly into the box as the switch is offered up to it but I think many professionals will have encountered similar or worse.I will admit my cables were both small and flexible - I only needed a 10A rating, if I were trying to connect 2.5mm2 or larger cables to fully utilise the 20A switch rating it would have been a far greater challenge, especially if the cores were solid rather than stranded, howeve I wouldn't expect solid cores to be used in the trypical applications you would use this switch for.There is a trade off between an oversized box that takes up more space and looks less attractive and one so small that is almost impossible to assemble, personally I am reasonably happy with the level of compromise here but any smaller would be a definite no! But don't cut the wires too short - leave enough length so they can bend and fold back neatly as you offer the switch to the box.

Good product.

Used on a dual supply to a septic tank