Osram 4052899957817 is a type of instant start electronic fluorescent ballast. It is designed to support T5, T8, and T12 fluorescent lamps. This multi-volt ballast operates at 120, 277, and 347 volts, and features temperature compensation, short circuit, overload, and end-of-life protection. It also features autorestrike, meaning that it will restart after power interruption, dimming capability, and greater efficiency than conventional magnetic ballasts.