Provide positive internal safety lockout on electrical enclosures while the equipment is energized. When energized, these interlocks prevent the door handle from being turned to open the door.Catalog numbers AEK115NDH, AEK230NDH and AEK460NDH are designed to be used on some HOFFMAN enclosures and boxes which have exterior latching only. When energized, these interlocks will prevent the enclosure door from being opened. They fit on the door or cover of the following enclosures and maintain UL Type 4, 4X and 12 when properly installed per HOFFMAN instructions: 1. One-door Type 4 and 4X enclosures 2. Two-door Type 4 and 4X enclosures 3. One-door Type 12 enclosures 4. Larger sizes of Hinge-Cover junction boxes 5. Type 1 and large Type 1 enclosures. The interlocks also fit in most HOFFMAN custom enclosures and boxes which have doors or covers hinged similar to doors or covers on the preceding enclosures.