Watertight Mechanical Interlock Device, Circuit Breaker Amp Rating 30 A, Circuit Breaker Type Not Applicable, Current Rating 30 A, Fuse Protection Non-Fused, Fuse Type Not Applicable, Locking Handle Yes, NEMA Enclosure Rating Not Rated, Number of Poles 3, Number of Wires 4, Voltage Rating 600V AC, Compatible Plug Manufacturer Part Number 3D150, Grounding Grounded, Horsepower Rating 20 hp, Housing Material , Maximum Wire Size 8 AWG, Phase Three, Resistance Properties Watertight