Square D A9.25 Thermal Unit Brand: Square D. Part Number: A9.25. Square D Thermal Unit, Melting Alloy, 5.63 to 7.67 A Full Load, Standard Trip, 3.6 in L x 2.6 in W x 1.7 in H, Plug-In Mount, 40 deg C. Additional Description: SQD -A9.25 THERMAL UNIT. Catalog Description: Thermal Unit, Type S, Type A, melting alloy, Class 20..