1.2uF 450V.AC CBB61  Fan Capacitors
 
CBB61 fan capacitors are non-polarized start/run capacitors, typically made with metallized polypropylene film, used to control the speed and starting of single-phase motors in electric fans (ceiling, wall, stand), range hoods, and ventilation systems. They feature low loss, heat resistance, and high overload capacity, and if your fan runs slow or stops, replacing a weak or burnt-out CBB61 capacitor often restores normal function. 

Key Characteristics:
Type: Metallized Polypropylene Film Capacitor.
Function: Start and run a single-phase motor, controlling fan speeds.
Poles: Non-polarized (no positive/negative, easy to wire).
Applications: Ceiling fans, range hoods, air exchange fans, small motors.
Symptoms of Failure: Slow fan speed, inability to change speeds, fan not working.
Replacement: A common, inexpensive fix for fan problems; check specifications (uF, V, Hz) for the right replacement. 
 
How They Work (Simplified):
The capacitor provides the necessary phase shift to help the motor start and then sustain its rotation, allowing for different speed settings on your fan. 

How to Replace:
Safety First: Disconnect power to the fan.
Identify Specs: Note the microfarad (µF) rating, voltage (V), and frequency (Hz) on the old capacitor.
Match & Install: Purchase a new CBB61 with matching or slightly higher specs (voltage/µF) and wire it in place of the old one (polarity doesn't matter).