Square D B2.10 Thermal Unit Brand: Square D. Part Number: B2.10. Square D Thermal Unit, Melting Alloy, 600 VAC, 1.34 to 1.64 A Full Load, Class 56/Standard Trip, 4.8 in L x 3.4 in W x 0.8 in H, Plug-In Mount, 40 deg C. Additional Description: SQD -B2.10 THERMAL UNIT. Catalog Description: Thermal Unit, Type S, Type B, melting alloy, Class 20..