This O series medium universal-mounted temperature control has an automatic reset, close-on-rise SPST switch. It has a temperature ranging from 0 to 55 degrees Fahrenheit and an operating voltage of 120V AC 24A. The NEMA 1 enclosure temperature control measures 3 1/2 width x 2 3/4 height x 2 inches depth and has a capillary with an air coil sensor. It meets the UL standard.