CBB61 4.5uF 250VAC Ceiling Fan Motor Capacitor – 2 Wire (Brand New)

100% brand new CBB61 4.5µF (4.5mfd) AC motor capacitor, rated 250VAC 50/60Hz, ±5% tolerance. Metallized polypropylene film (MPP) dielectric in a flame-retardant rectangular plastic case with epoxy seal. 2-wire, non-polarized — direct replacement for weak or failed ceiling-fan capacitors causing slow start, humming, or stuck speeds.

Specifications

Type	CBB61 metallized polypropylene film (MPP) motor run capacitor
Capacitance	4.5µF / 4.5mfd, ±5%
Voltage	250VAC
Frequency	50Hz / 60Hz
Leads	2 wires (~120mm typical), non-polarized
Case	Rectangular ABS/plastic, ~37×26×15mm (1.5×1.0×0.6in) typical
Dielectric	Self-healing metallized polypropylene film
Mounting	Snap / cable-tie in fan switch housing
Polarity	None — AC film capacitor

What It Does

In a single-phase ceiling-fan motor, the capacitor sits in series with the auxiliary winding and shifts current phase so the motor develops starting torque and maintains steady speed. When the film degrades and µF drifts low, the motor loses phase shift, causing humming, slow start, or failure to spin. A fresh 4.5µF CBB61 restores proper operation.

Compatible Use Cases

• Ceiling fans (single-speed or multi-speed switch-controlled)
• Wall fans, stand fans, table fans
• Exhaust / vent fans, range hood blowers
• Small single-phase AC motors, water pumps
• Replacement for old 4.5µF 250VAC CBB61 / CBB60 film capacitors

Replacement Rules

• µF must match: 4.5µF, ±5% tolerance. Never substitute 4µF or 5µF blindly.
• VAC equal or higher: 250VAC → 370VAC/450VAC is safe. Never lower.
• Type: AC film (CBB61/CBB60), NOT aluminum electrolytic, NOT DC-rated.
• Wires: 2-wire single-value. If your fan had 3/4/5 wires, order the multi-tap version.

Wiring (2-wire)

1. Kill power at the breaker. Confirm no voltage at the fan canopy.
2. Photo the old cap before disconnecting.
3. CBB61 is non-polarized — either lead to either terminal. One to motor auxiliary winding, one to line side per fan diagram.
4. Push connectors fully home. No bare copper showing.
5. Restore power, test all speeds, verify quiet operation.

Failure Symptoms

• Fan hums but won't start until blade pushed by hand
• Runs noticeably slower than before
• Speed settings don't respond or skip
• Capacitor case swollen, discolored, or burnt smell
• Motor warm-to-hot during normal run

Condition

100% brand new, lead-forming intact, case not bulged, capacitance within ±5% at outgoing test. RoHS-compliant, flame-retardant case.