What a CBB61 is
A CBB61 is a small box-type film run capacitor for fan motors: heat pump outdoor fans, rangehoods, extractor fans and other small fan motors. It stays in the circuit while the motor runs, so a weak one shows up as a fan that starts slowly, hums or runs at the wrong speed. It is a different, smaller part from the CBB60 motor run capacitor used on pumps.
How to pick one
Match the µF printed on your old capacitor within ±10%. The voltage must be the same or higher, so a 450V CBB61 is fine in place of a 250V, 370V or 400V part. These are single-section, two-terminal capacitors: if your old one has three or more wires, or several µF values printed on it, it is a different part. Choose lug terminals or wire leads to match how the old one connects, and check its size against the space before ordering. Every size: 1µF, 1.2µF, 1.5µF, 1.8µF, 2µF, 2.5µF, 3µF, 3.5µF, 4µF, 4.5µF, 5µF, 6µF, 8µF, 10µF, 12µF, 15µF.