A run (running) capacitor in a residential air conditioner plays a critical role in keeping the motor(s) operating efficiently and reliably after startup. Here are its main functions:
Most residential AC units use single-phase power, but the compressor and fan motors are designed to operate like two-phase motors.
The run capacitor:
Creates a phase shift between the start and run windings
Produces a rotating magnetic field
Keeps the motor running smoothly after it starts
Without it, the motor would not run efficiently.
The capacitor:
Optimizes the motor’s power factor
Reduces energy waste
Helps the motor draw the correct amount of current
This leads to lower energy consumption and reduced heat buildup.
It helps the compressor and fan motor maintain:
Stable operating torque
Consistent speed under load
This is especially important for the compressor, which must handle refrigerant pressure changes.
By keeping current and voltage balanced:
The motor runs cooler
Windings are protected from excessive heat
Overall lifespan of the motor is extended
Many residential AC units use a dual run capacitor, which has:
One section for the compressor (HERM)
One section for the condenser fan motor (FAN)
A shared common (C) terminal
This allows one component to serve two motors.
AC won’t start or struggles to start
Humming sound from the unit
Fan not spinning (or spinning slowly)
Compressor overheating
Breaker trips
Higher electric bills
A run capacitor:
Keeps motors running smoothly
Improves efficiency
Reduces heat and wear
Ensures proper torque
Supports compressor and fan operation
Below is the list of our running capacitors
1. 20uf
2. 25uf
3. 30uf
4. 35uf
5. 40uf
6. 45uf
7. 50uf
8. 60uf
9. 70uf
Malaysia
