Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 45.4 to 49.1 A 46 to 49.2 A 48 to 51.9 A 48.4 to 52.6 A 50.8 to 54.9 A 51 to 54.4 A 51 to 55.5 A 51.3 to 56 A 55 to 59.7 A 55.9 to 59.5 A NEMA Size 3 4 Frame Size CC S