Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 54.3 to 55.7 A 57.5 to 61.3 A 60.7 to 63.9 A 60.8 to 64.8 A 61 to 65.1 A 63.4 to 67.2 A 64.3 to 68.7 A 64.4 to 68.9 A 69.6 to 75 A 69.7 to 74.8 A NEMA Size 3 4 Frame Size CC S