Thermal Unit Trip Class 20 Overload Protection Type Melting Alloy Full Load Current 2.86 to 3.26 A 2.91 to 3.19 A 2.99 to 3.4 A 3.07 to 3.45 A 3.08 to 3.59 A 3.15 to 3.47 A 3.27 to 3.59 A 3.4 to 3.75 A 3.49 to 3.83 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