Square D A16.2 Thermal Unit Brand: Square D. Part Number: A16.2. Square D, A16.2, Overload Heater, Melting Alloy, 600 V AC, 10.9 to 12.1 A Full Load, Class 20/Standard Trip, 2.6 in L x 1.7 in W x 3.5 in H Size, Plug-In Mounting, 40 deg C. Additional Description: SQD -A16.2 THERMAL UNIT. Catalog Description: Thermal Unit, Type S, Type A, melting alloy, Class 20..