Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 3.5 to 3.92 A 3.57 to 3.83 A 3.65 to 4.08 A 3.71 to 4.07 A 3.8 to 4.27 A 3.84 to 4.16 A 4 to 4.42 A 4.17 to 4.51 A 4.25 to 4.62 A Frame Size A S Compatible with Grainger Part Number 1H385 1H386 1H387 1H388 1H389 1H39 1H392 1H393 2BV58 2BV66 2BV67 2BV71 2BV72 48P274 48P276 48P277