The FS-U 120v starter is a starting aid for pre-heat fluorescent lamps. It is designed for 4W to 30W fluorescent preheat ballasts. It has a twist lock base that will fit any starter base socket.It serves as a universal, automatic timed switch that, in conjunction with a ballast, heats the tube filaments to start the lamp and often includes a condenser to improve performance.
Purpose: Initiates the fluorescent tube, often used in older fixtures, by allowing current to flow through the lamp's electrodes, heating them up, and then breaking the circuit to create a voltage surge that lights the bulb.
Wattage Range: Commonly designed for 4W-30W.
Compatibility: Replaces standard single-tube starters like FS-2, FS-4, and FS-5 in many applications.
Design: Features a twist-lock (bayonet) aluminum base, allowing for easy, quick installation.
Indicators for Replacement: Replace the starter if the lamp flickers, only glows at the ends, or fails to start.