Tridonic Atco EC58/65B2 B2 Magnetic Ballast, Choke, 240V, 58/65W, Fluoro, Fluorescent

The magnetic ballast uses a magnetic transformer of copper windings around a steel core to convert the input line voltage and current to the voltage and current to the voltage and current required to start and operate the fluorescent lamps. Capacitors are added to assist lamp starting and power factor correction.