Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 49.2 to 53.4 A 49.3 to 51.6 A 52 to 56.5 A 52.7 to 56.8 A 54.5 to 57.4 A 55 to 59.9 A 55.6 to 59.9 A 56.1 to 60.1 A 59.6 to 64.5 A 59.8 to 65.4 A NEMA Size 3 4 Frame Size CC S