4 1/8 INCH W X 2 3/16 INCH D X 5 7/8 INCH H SIZE; 24 MIN. AC VOLTAGE RATING; 30 MAX. AC VOLTAGE RATING; 50/60 HZ FREQUENCY RATING; DUCT, TANK APPLICATION; 24 TO 30 VAC VOLTAGE RATING; 125 DEG F OPERATING TEMPERATURE; COPPER; TRADELINE. BRAND