The THERMOFLEX? CF/CR Series standard heat detectors are available in single or multiple circuits with open or closed contact configurations. THERMOFLEX? CF/CR Series detectors are available in 135?F, 165?F, 200?F, and 285?F versions.THERMOFLEX? CF SeriesThe CF Series detectors are Fixed Temperature only. They will operate when the detector reaches the applicable temperature. Fixed Temperature detectors are non-restorable.THERMOFLEX? CR SeriesThe CR Series detectors are combination Rate-of-Rise and Fixed Temperature. The Rate-of-Rise function allows the detector to operate when the temperature at the detector increases at a rate of 15?F per minute. The Fixed Temperature portion will cause the detector to operate when it reaches the applicable temperature. The Rate-of-Rise portion of the detector is restorable; however the Fixed Temperature portion is non-restorable. Main FeaturesOpen or closed contact versions availableAvailable in single or multiple circuit versionsProduct includes a 5 year warranty