5 1/4 INCH L X 4 1/4 INCH W X 3 INCH D OVERALL DIMENSIONS; 0.25 AMPERE AT 0.25 TO 12 VDC, 1.5 AMPERE AT 24 VAC CURRENT RATING; 0 TO 100 DEG F TEMPERATURE RATING; HEATING CONTROL SYSTEM; SPST SWITCH TYPE; R8146 MODEL