Craig and Derricott i-Switch Fuse Combination Unit is made of powder coated sheet steel with switches mounted on a removable galvanised chassis plate. The unit is provided with removable top and bottom gland plates. Padlockable handle which allows for the insertion of up to three padlocks in the ‘Off’ position thus preventing the isolator being switched to the ‘On’ position. The door interlock handle can be defeated to enable emergency opening or for testing purposes.