Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 51.7 to 54.2 A 53.5 to 57.4 A 56.6 to 60.7 A 56.9 to 60.9 A 57.5 to 60.6 A 60 to 63.3 A 60 to 64.2 A 60.2 to 64.3 A 64.6 to 69.5 A 65.5 to 69.6 A NEMA Size 3 4 Frame Size CC S