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 Thermoplastic Maximum Wire Size 8 AWG Phase Three Resistance Properties Watertight