Mechanical Interlock Device Circuit Breaker Amp Rating 20 A Circuit Breaker Type Not Applicable Current Rating 20 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 240V AC Compatible Plug Manufacturer Part Number 3D138 Grounding Grounded Horsepower Rating 5 hp Housing Material Thermoplastic Hub Diameter 1 in Maximum Wire Size 10 AWG Phase Three