Motor Capacitors | Start, Run & Permanent Split Capacitors

Capacitors are essential electrical components used in countless industrial, commercial and residential applications. Whether fitted to electric motors, pumps, compressors, or evaporative cooling systems, a capacitor improves motor performance by storing and releasing electrical energy when it needs it most.

At BCB Sales & Service, we supply a wide range of capacitors suitable for electric motors and other industrial equipment. From permanent split capacitors (PSC) to motor start and motor run capacitors, our range helps keep equipment operating reliably and efficiently.

Whether you're replacing a faulty capacitor, maintaining industrial machinery or sourcing quality electrical components, BCB Sales & Service can help you find the right product for your application.

What are Motor Capacitors?

Capacitors consist of two conductive plates separated by a non-conductive substance known as a dielectric. The dielectric itself can be made of various materials, including electrolytic, ceramic, and film, each offering distinct characteristics for specific applications.

The unique combination of plate and dielectric materials forms a diverse array of motor capacitors, each tailored for certain roles and functions in electrical circuits. A capacitor's ability to store electrical charge is measured in farads, with smaller units like microfarads (uF), nanofarads (nF), and picofarads (pF) commonly used for more precise measurements. Capacitors with a capacity of 1 Farad or more are often categorised as Supercapacitors, denoting their substantial energy-storing capability.

Explore Our Comprehensive Range of Capacitors for Sale

BCB Sales & Service offers a variety of capacitors suitable for different applications in air conditioning, refrigeration, heating, industrial and more. Our product range includes motor capacitors known for their durability and efficiency, ideal for commercial use, as well as run and start capacitors crucial for optimising residential system performance.

With specific capacitance options like 10uf, 25uf, and 8uf capacitors, we can meet a broad range of requirements.

Start Capacitors

Start capacitors provide a temporary boost of electrical energy during startup. They create the additional torque needed to get heavier loads moving. Once the motor reaches operating speed, the start capacitor is disconnected from the circuit.

Start capacitors are commonly used on:

• Air compressors
• Pumps
• Workshop equipment
• Heavy-duty motors

We supply:

• 110 Volt
• 125 Volt
• 165 Volt
• 250 Volt
• 275 Volt
• 330 Volt

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Run Capacitors

Run capacitors remain connected while the motor is operating. They improve efficiency, maintain torque, and support smooth operation.

Run capacitors are commonly found in:

• Fan motors
• Blowers
• Air conditioning systems
• Evaporative cooling systems
• Ventilation equipment

We supply:

• 4 Terminals
• Flying Leads
• P2 Metal

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Capacitors in Electric Motors

Many single-phase induction motors rely on capacitors to start and run efficiently. Without the correct capacitor, the motor may:

• Fail to start
• Hum without rotating
• Trip circuit protection
• Run inefficiently
• Overheat

Capacitors are widely used in:

• Phase induction motor applications
• Fan motors
• Evaporative cooler motors
• Air compressor motors
• Pump motors
• Workshop machinery

Replacing a failed capacitor can often restore normal motor operation without replacing the complete motor.

Choosing the Correct Replacement Capacitor

Selecting the correct replacement involves more than matching physical size. Important specifications include:

• Capacitance (µF)
• Voltage rating
• Motor type
• Operating temperature
• Physical dimensions
• Terminal configuration

Using an incorrect capacitor can reduce motor performance or potentially damage the motor. If you're unsure which capacitor is suitable, BCB Sales & Service can help identify the correct replacement.

Why Capacitor Quality Matters

Not all capacitors are manufactured to the same standard.

High-quality components offer:

• Stable electrical performance
• Longer service life
• Reliable operation
• Improved safety
• Better resistance to heat

At BCB Sales & Service, we source quality capacitors suitable for industrial and commercial applications where dependable performance matters.

Why Choose BCB Sales & Service for Your Motor Capacitors

At BCB Sales & Service, we can help you create customised solutions for your needs with Australia's most complete range. Our extensive selection ensures you'll find the perfect match for any requirement, be it a motor capacitor or a specific 10uf, 25uf, or 8 uf capacitor and beyond.

Each capacitor for sale has undergone rigorous testing to ensure longevity and performance. Benefit from our competitive pricing, delivering value without compromising on quality.

Our knowledgeable team is also on hand to provide recommendations tailored to your unique needs. We pride ourselves on offering ongoing support and assisting with any enquiries post-purchase.

With us, you will find:

• Motor Capacitors from Leading Brands: Essential for the smooth operation of commercial equipment, our motor capacitors are built to last.
• Run and Start Capacitors: Optimise the efficiency of your systems with our reliable run and start capacitors, ideal for a variety of applications.
• Specific Capacitance Options: Tailored to your needs, we offer capacitors in various capacitances, including 10uf, 25uf, and 8 uf, ensuring you find exactly what your project requires.
• Local Availability: With capacitors near you, you can easily access our products wherever you are in Australia.

Shop Quality Motor Capacitors at BCB Sales & Service

Whether you're replacing a faulty start capacitor, a permanent split capacitor, or a run capacitor, choosing the correct component is essential for reliable motor performance. A quality capacitor can restore starting torque, improve efficiency and help extend the life of your electric motor.

BCB Sales & Service supplies a wide range of motor capacitors for electric motors, evaporative cooling systems, pumps, compressors and other industrial equipment. Browse our range online today or contact us today for tailored support by calling (03) 9546 3833, emailing sales@bcbsales.com.au, or submitting an online enquiry. Our friendly team will respond as soon as possible.

Frequently Asked Questions on Motor Capacitors

What Is a Capacitor?

A capacitor is an electrical component that stores electrical energy in an electric field and releases it when required.

Unlike a battery, which stores energy chemically, a capacitor stores energy electrostatically between two conductive plates separated by an insulating material.

When you apply voltage, the capacitor stores energy and can quickly release it back into the electrical circuit.

This ability to store and discharge energy makes capacitors essential in many electrical and electronic applications.

What Does a Capacitor Do?

A capacitor stores electrical energy and releases it when required, so the answer depends on the application.

In electric motors, capacitors primarily help:

• Start the motor
• Improve running efficiency
• Increase starting torque
• Improve power factor
• Provide smoother operation
• Support reliable performance under load

Outside electric motors, capacitors are also used in:

• Electronic circuits
• Power supplies
• Lighting systems
• Industrial controls
• Air conditioning equipment

Because they can rapidly store and release energy, capacitors play an important role in modern electrical systems.

What does a permanent split capacitor do?

A permanent split capacitor remains connected while the motor operates, improving efficiency and maintaining smooth performance.

Can a faulty capacitor stop a motor from starting?

Yes. A failed capacitor is one of the most common causes of a motor humming without turning.

Can I replace a capacitor myself?

Only replace the capacitor after you've safely discharged it and confirmed the correct specifications. If you're unsure, seek assistance from a qualified technician.

How do I know which capacitor I need?

Check the existing capacitor's capacitance (µF), voltage rating and physical specifications. If you need assistance, BCB Sales & Service can help identify a suitable replacement.

What are some signs of a faulty capacitor?

Like any electrical component, capacitors eventually wear out.

Common symptoms include:

• Motor humming but not starting
• Slow startup
• Reduced motor performance
• Overheating
• Frequent tripping
• Intermittent operation
• Bulging capacitor casing
• Oil leakage
• Burning smell