Square D (Schneider Electric) A25.2 Overload Relay. Square D™ Thermal Unit Melting Alloy 600 VAC 11.8 to 16 A Full Load Class 20/Standard Trip 1.8 in L x 2.6 in W x 3.7 in H Plug-In Mount 40 deg C. Additional Description: SQD -A25.2 THERMAL UNIT. Catalog Description: Square DTHERMAL UNIT40C ambient rated600VACDependant on overload relayFor use in melting alloy thermal overload relaysManualNEMA Overload relaysSchneider ElectricStandard Trip- Class 20Thermal - Melting Alloy Thermal Unit.