This MCB lockout device utilises a thumb screw for easy no tool installation and is suitable for use on virtually all ISO/DIN circuit breakers. It can be fitted vertically or horizontally and is small enough to be used side by side on adjacent breakers. Simply lift up the cover and fit the unit onto the MCB toggle when in the OFF position, screw down the thumbscrew tight and close the cover, locking the unit with a padlock. The device also has 2 locking options providing flexibility when applying a padlock either vertically or horizontally.