Melting Alloy Thermal Unit, Class 20 Standard Trip, Type A, 4.63 - 4.92 A (1 Thermal Unit), 4.52 - 4.83 A (2 Thermal Unit), 4.47 - 4.46 A (3 Thermal Unit) Full Load, 40 deg C Operating, Plug-In Mount, 1.8 in L x 2.7 in W x 3.5 in H