Capacitors

HVAC capacitors are replacement electrical components used by service professionals and maintenance teams to support AC motor starting and motor operation in compatible climate-control equipment. This category includes start capacitors for intermittent motor-start circuits, run capacitors for motor-run applications, and dual run capacitors that provide two capacitance values in one component.

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Helpful Buying Guide

Choose an HVAC Capacitor That Matches the Application

Capacitor replacement starts with matching the type, capacitance rating, voltage rating, and physical form required by the compatible equipment. The products represented here include round and oval run capacitors, dual run capacitors, and intermittent-duty motor start capacitors for HVAC service work.

Visual Guide

Popular examples in this category

Round Start Capacitor, 108-130 MFD, 330VRound Start Capacitor, 108-130 MFD, 330VWBB430363Round Motor Start Capacitor, 400-480 MFD, 110/125VRound Motor Start Capacitor, 400-480 MFD, 110/125VWBB430356Round Dual Run Capacitor, 10 + 10 MFD, 440VRound Dual Run Capacitor, 10 + 10 MFD, 440VWBB312570425 MFD 440V Oval Run Capacitor25 MFD 440V Oval Run CapacitorWBB3125708
Use Cases

Support starting or running motor systems

Start capacitors are intended for AC motor starting circuits with intermittent-duty operation. Run capacitors support compatible motor-run applications, while dual run capacitors provide two stated capacitance values for compatible HVAC motor systems.

How to Choose

Match the listed electrical requirements

Compare the specified MFD value or range, voltage rating, and whether the application needs a start, run, or dual run capacitor. Also match the required round or oval form factor and available installation space.

Applications

Plan for HVAC service replacements

These capacitors are used by HVAC technicians and maintenance professionals servicing compatible climate-control and motor-driven equipment. Some motor start models are rated for 3-second starts and up to 20 starts per hour.

Additional Information

Review construction and operating details

Available features include metal cases, moisture- and oil-resistant molded housings, insulated terminals, dual-blade terminals, vacuum-sealed construction, non-PCB oil fill, and stated operating temperature ranges.

3Capacitor types

Start, run, and dual run options are represented.

7.5-1200MFD range represented

Listed ratings span from 7.5 MFD to 1000-1200 MFD.

110/125V-440VVoltage ratings represented

Products include 110/125V, 330V, 370/440V, and 440V ratings.

Round or ovalForm factors

Select the shape specified for the compatible replacement application.

Comparison Guide

Compare Capacitor Types

Use the required electrical function and listed application details to narrow the appropriate capacitor type.

TypeWhat it supportsSelection factors represented
Motor start capacitorIntermittent AC motor starting circuitsMatch the MFD range and 110/125V or 330V rating; certain models are rated for 3-second starts and up to 20 starts per hour.
Motor run capacitorCompatible motor operationMatch the single MFD and voltage rating; compare round or oval profile, terminals, and stated operating range.
Dual run capacitorCompatible HVAC motor applications requiring two capacitance valuesMatch both listed MFD values, voltage rating, round profile, and applicable space or connection requirements.
Planning Guide

Plan the right fit before choosing

Capacitor Types

Select start, run, or dual run construction

The product range represents three application types. Motor start capacitors provide starting capacitance for AC motor starting circuits and are identified for intermittent duty. Motor run capacitors provide a single capacitance value for compatible motor operation. Dual run capacitors provide two values, such as 10 + 10 MFD, 35 + 5 MFD, 35/5 MFD, 70/10 MFD, or 70 + 5 MFD.

  • Use a start capacitor when the compatible motor-start circuit calls for intermittent starting support.
  • Choose a single-value run capacitor when the replacement requirement specifies one MFD rating.
  • Choose a dual run capacitor when the compatible equipment requires two listed capacitance values.
Electrical and Fit Considerations

Compare ratings before selecting a replacement

Match the capacitor's stated MFD rating and voltage rating to the compatible application. Represented voltage options include 110/125V, 330V, 370/440V, and 440V. Form factors include round and oval styles, with selected round models having compact stated dimensions.

  • Available capacitance examples range from 7.5 MFD to 1000-1200 MFD, including single, dual, and range ratings.
  • Some run and dual run models are listed at 370/440V, while others are listed at 440V.
  • Round and oval profiles should be compared against the existing component and installation space.
Operating Conditions and Connections

Consider terminals, housing, and stated temperature range

Connection and construction details vary by model. Certain products include insulated terminals, quick-connect blade terminals, or dual-blade terminals. Several run capacitors feature vacuum-sealed construction and are stated for operation from 40°F to 158°F; selected motor start models have moisture- and oil-resistant molded housings and a stated range from -40°F to 149°F.

  • Insulated terminals and quick-connect or dual-blade terminal formats can help match the stated installation connection style.
  • Vacuum-sealed construction is described as helping limit exposure to leaks and contaminants.
  • Check the model-specific operating range where temperature conditions are a selection factor.
FAQ

Common questions before buying

What is the difference between a start capacitor and a run capacitor?

Start capacitors are used for intermittent AC motor starting circuits, while run capacitors support compatible motor operation.

What does a dual run capacitor provide?

A dual run capacitor provides two stated capacitance values in one component, such as 35 + 5 MFD or 70 + 5 MFD.

How should I compare voltage ratings?

Match the listed voltage rating to the requirement of the compatible application. Ratings represented include 110/125V, 330V, 370/440V, and 440V.

Are both round and oval capacitors available?

Yes. The represented products include round capacitors and oval run capacitors, so the required form factor should be part of replacement selection.

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