RUN CAPACITORS (MOTOR RUN CAPACITORS)

Built for Aussie worksites. These All Controls 450VAC P2 aluminium motor run capacitors are the dependable replacement for tired run caps on single-phase motors in HVAC, refrigeration, and pumps. A correct run capacitor helps the motor hold torque and efficiency under load, which means cooler windings, steadier RPM, and fewer “came back again” call-outs.

How a Motor Run Capacitor Works (and what it’s for)

A motor run capacitor stays in the circuit while the motor is running, creating a phase shift between the run and auxiliary windings on PSC (permanent split capacitor) style motors. In plain terms: it helps the motor keep spinning smoothly and efficiently, which is why weak run caps often show up as low airflow, noisy operation, higher amps, overheating, or a motor that struggles under heat load.

Key Features & Trade Benefits

These are built for continuous duty in real site conditions, not “bench only” theory. Choose the correct µF and you’ll usually see smoother operation, better power factor, and less stress on the motor—especially on hot roofs and in tight plant rooms.

• P2 safety class: self-healing film design for continuous duty, which helps protect fan motors, blowers, and compressors when the roof’s cooking.
• 450 VAC rating: gives headroom for voltage spikes and rough sites—handy on long runs and older switchboards.
• 1–100 µF range: match the correct µF so the motor holds RPM, draws sensible current, and runs quieter.
• Aluminium case: tougher against vibration and exposure—ideal for rooftops, condenser compartments, and plant rooms.
• Clear µF labelling: faster swaps and less guesswork when you’re time-poor.

Available Sizes (from the attached variant list)

The most common mistake is “close enough” sizing—run capacitors are not the place to freestyle. Use the table below to match your required µF to the correct variant/SKU so you can order fast and fit the right part first go.

Why This Product Matters

Up on a roof in 40-degree heat, you want parts that solve the fault—not parts that “might do.” When you swap a weak run cap with the correct µF, you’ll often see smoother running, lower current draw, and better airflow—fair dinkum difference that customers notice straight away.

For systems that need both start and run support, pair this with a correctly sized start unit from our Start Capacitors range so the motor gets off the line cleanly and stays stable once running.

Pro Tip (Choosing & Testing)

Match the µF printed on the OEM capacitor (a small tolerance is normal—don’t jump sizes unless the motor data says so). Before you touch anything, isolate power and safely discharge the old capacitor, then test the old and new cap with a capacitance-reading meter to confirm you’ve fixed the real issue—not just masked it.

If you need a meter that can read capacitance on site, grab one from our Multimeters collection.

Compatibility & System Info

These capacitors are for single-phase induction/PSC motors used in condenser fans, evaporator fans, blowers, and many pump setups. They’re used across HVAC and refrigeration gear regardless of refrigerant—the capacitor choice is based on the motor design and µF requirement, not the gas in the system.

• Common uses: condenser fan motors, indoor blower motors, ventilation fans, some single-phase compressor circuits that specify a run cap.
• Voltage: 450VAC (use equal or higher voltage than OEM; never lower).
• Selection: match µF to the motor label/service manual; don’t “oversize” to chase torque.

Local Jobsite Notes

Brisbane humidity, Sydney salt air, and dusty regional installs all punish electrical components over time. The aluminium can construction is a solid choice for vibration and exposure, but good mounting and tidy terminations are what keep it reliable for the long haul.

What’s Included

You’ll receive one motor run capacitor in the µF value you select at checkout, ready to fit with standard motor-cap wiring practices. Because these are sold as variants, double-check the µF on your old capacitor before ordering so the replacement is a true like-for-like match.

• 1 × 450VAC P2 aluminium motor run capacitor (select your µF value)

Specifications

Run capacitor specs can vary slightly by µF and batch, so always confirm the label on the exact unit you receive. The table below covers the key trade details that matter for ordering, fitting, and compliance-style job notes.

Warranty & Returns

Backed by manufacturer’s warranty (minimum 12 months) and 30-day returns for unused items in original packaging. For full details, see our Shipping & Returns policy before ordering.

FAQs

How do I choose the right µF?

Match the µF printed on the motor’s original capacitor and stick to the motor spec—this is what keeps current draw and torque where the manufacturer intended. If the label is unreadable, check the motor plate/service manual or test the existing cap with a capacitance meter before you order.

Can I go higher on voltage?

Yes—equal or higher voltage than OEM is fine (for example, replacing a 370VAC cap with a 450VAC cap). Never go lower on voltage rating because it reduces safety headroom and reliability.

Do I need a start capacitor as well?

Some motors (PSC) only use a run capacitor, while others use a separate start capacitor or start kit to get off the line. If your motor is struggling to start or the system specifies a start component, use a correctly sized unit from our Start Capacitors range.

What about relays/overloads?

If you’re chasing nuisance trips or inconsistent starts, pairing the right capacitor with a matched protection/starting solution can tidy the whole job. See our Relay Overload Combo for a field-friendly option commonly used in single-phase refrigeration compressor starts.

Related Products

• Need a fixed-bolt version? Handy where vibration is gnarly and you want a rock-solid mount.
• Relay Overload Combo — helps protect windings and tidy up unreliable compressor starts.
• Start Capacitors — for motors/systems that need extra starting torque.