Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 60.4 to 63.5 A 63.6 to 66.3 A 67.2 to 70.1 A 67.8 to 70.9 A 68.5 to 73.4 A 71.5 to 74.8 A 72 to 75.4 A 72.5 to 74.9 A 78.2 to 82.3 A 79.8 to 83.1 A NEMA Size 3 4 Frame Size CC S