1/2 INCH DIAMETER X 4-3/16 INCH LENGTH COPPER BULB AND 5 FOOT LENGTH CAPILLARY TYPE; 280 DEG F MAX. TEMPERATURE RATING; 24 TO 30 VOLT AC CONTACT RATING; STORAGE TANK, DUCT APPLICATION; OVERALL DIMENSION 2 INCH WIDTH X 2-1/4 INCH DEPTH X 5-5/8 INCH HEIGHT