Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 42.9 to 45.3 A 43.2 to 45.9 A 45.4 to 47.9 A 45.9 to 48.3 A 48 to 50.9 A 48.1 to 50.7 A 48.4 to 50.9 A 48.7 to 51.2 A 51.2 to 55.8 A 52.1 to 54.9 A NEMA Size 3 4 Frame Size CC S