China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

 In accordance with the National Electrical Code (NEC), all canned and potted electronic fluorescent ballasts require built-in Class P Thermal Protection. This protection is provided by a switching device that shuts down the circuit if the ballast temperature rises to 105°C or greater.

A ballast, like any electrical device, generates heat. To ensure maximum ballast life, it is imperative that operating temperatures be kept as low as possible. Burned-out or failing lamps, or high temperatures in or around the fixture, can cause the ballast to overheat, resulting in premature failure. For additional information regarding heat and recommendations for maximizing ballast life and performance, consult Universal Lighting Technologies' catalogs.

Most fluorescent lamp ballasts incorporate internal automatic-resetting thermal protection, which deactivates the ballast should it overheat. Normal operation resumes once the ballast has cooled sufficiently. Cycling will continue until the cause of overheating is corrected.

Ballasts manufactured before 1984 may contain non-resetting thermal protection, which permanently deactivates the ballast, or no thermal protection at all.