Power Supply Receptacle, Current Rating 30 Amps, Voltage Rating 600 Volts, Power Rating 20 HP, Number of Poles 3, Number of Wires 4, Phase Three, Accepts Plug 3D150, Internal, Pin/Sleeve, Mechanical Circuit-Lock Watertight Mechanical Interlock DevicesSpace-saving, nonmetallic units incorporate disconnect and receptacle. This meets the NEC requirement for a separate disconnect means within sight of all motor loads. Arc protection: The devices cannot be turned on without the proper plug fully inserted, and with power On, the plug cannot be removed. Enclosure can be connected to metallic conduit without interfering with ground continuity. For welders, conveyors, portable motors, and food processing equipment in factories, convention centers, and jobsites.Lockable in Off position for compliance with OSHA lockout requirements UL Type 4X, 12K watertight enclosures Use appropriate Class J time-delay fuse (see page 265)