Tridonic PC Top Ballast for fluorescent lamps with constant luminous flux irrespective of fluctuations in mains voltage. Automatic start after replacement of defective lamps. Safety shutdown of defective lamps and at end of lamp life. Push terminal for rapid automatic or manual wiring. For luminaires of protection class I and protection class II. Lamp preheating for min. 30,000 starts without replacement of lamps. CELMA Energy Efficiency Index A2. For emergency lighting systems as per EN 50172.