QOU Accessories for QO and QOU Miniature Circuit Breakers, QO1PL, is a Handle Padlock Attachment for Padlocking in ON or OFF position with fixed attacheMount. . These busways are consturcted in three-pole and four-pole neutral configurations for system voltages of 600 volts and are rated to allow 100% of the current to flow. These busways are designed specifically to allow maximum flexibility, ease installation and offer electrical efficiency in the distribution of low power. This accessory is a I-line hanger that is rated at 400 A and is installed horiziontal and used seismic applications. This accessory is UL and CSA certified product.