Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 4.09 to 4.64 A 4.21 to 4.49 A 4.33 to 4.9 A 4.39 to 4.68 A 4.44 to 5 A 4.6 to 4.9 A 4.62 to 5.23 A 4.84 to 5.49 A 4.93 to 5.61 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