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/250V DC Compatible Plug Manufacturer Part Number 5HJ23 Grounding Grounded Horsepower Rating 20 hp Housing Material Thermoplastic Hub Diameter 1 in Maximum Wire Size 8 AWG Phase Single Three