BOJACK 1 Poles FLA 40 Amp Coil 24 VAC Air Conditioner Condenser Compressor Contactor AC Definite Purpose Contactor
4.5Editor score
24 VAC coil voltage
40 Amp FLA rating
600 VAC max voltage
In this guide
Choosing the right contactor switch for AC units is essential for keeping your cooling system running smoothly during the hottest months of the year.
We have analyzed ten highly rated options based on durability, coil voltage, and compatibility with major HVAC brands to help you make an informed decision.
Each pick highlights key specifications and real-world performance notes while keeping in mind that prices and availability may change over time.
Top 3 Picks for Best Contactor Switch for AC Units
1 Pole 40 AMP Heavy Duty Enclosed AC Contactor
4.7Editor score
Enclosed contacts protection
Universal brand compatibility
Heavy lug terminals
EATON CUTLER HAMMER C25CNB140T COMPACT 1P W/SHUNT 40A QUAD QC 24VAC COIL
5.0Editor score
Compact encased design
Universal mounting plate
Quick connect terminals
Top 10 Best Contactor Switch for AC Units in 2026 Compared
The table below provides a side-by-side look at the top ten contactor switches for AC units available on the market today.
ProductsSpecificationsEditor scorePrice
Best Budget
BOJACK 1 Poles FLA 40 Amp
1 Pole Configuration
40 Amp FLA
24 VAC Coil
600 VAC Max
4.5Editor score
Editor's Choice
1 Pole 40 AMP Heavy Duty Enclosed
Enclosed Contacts
40 Amp Rating
24 Volt Coil
Universal Fit
4.7Editor score
Best Premium
BOJACK 2 Poles FLA 40 Amp
2 Pole Configuration
40 Amp FLA
24 VAC Coil
600 VAC Max
4.6Editor score
Goodman Air Conditioner Contactor
Factory Authorized
Goodman Amana
OEM Quality
Direct Fit
4.6Editor score
Dreyoo 1 Pcs 24V Coil 40A 2 Pole
2 Pole Design
40A FLA
24V Coil
Hermetically Sealed
4.7Editor score
SunLee 2 Pole 40 Amp contactor 120v Coil
2 Pole Switch
40 Amp FLA
120 Volt Coil
Class F Insulation
4.6Editor score
2 Pole AC Contactor Generic Heavy Duty
2 Pole Switch
40 Amp FLA
24V Coil
600 VAC Max
4.5Editor score
C25BNB230A Contactor 2-Pole 30 Amp
2 Pole Switch
30 Amp Rating
120 VAC Coil
Premium Encased
4.6Editor score
2 Pole Air Conditioner Contactor Condenser
2 Pole Switch
40 Amp FLA
24V Coil
Fully Enclosed
4.6Editor score
EATON CUTLER HAMMER C25CNB140T
1 Pole Switch
40 Amp Rating
24VAC Coil
Compact Design
5.0Editor score
1. BOJACK 1 Poles FLA 40 Amp Coil 24 VAC Air Conditioner Condenser Compressor Contactor AC Definite Purpose Contactor – Best Overall Budget Contactor
BOJACK 1 Poles FLA 40 Amp Coil 24 VAC Air Conditioner Condenser Compressor Contactor AC Definite Purpose Contactor
40 Amp FLA Rating
24 VAC Coil
600 VAC Max Voltage
1 Pole Configuration
This BOJACK contactor switch for AC units offers a reliable solution for homeowners needing a quick replacement without breaking the bank. It holds a solid 4.5 rating from users who value its straightforward design and high current capacity.
Pros
- Affordable price point
- High ampacity rating
- Compatible with most systems
- Simple installation process
Cons
- Basic plastic housing
- No warranty mentioned
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The 40 Amp FLA rating ensures it can handle the load of standard residential condenser compressors effectively. The 24 VAC coil is standard for most HVAC control boards, making it a universal fit for many existing setups.
While the housing is basic compared to premium brands, it performs the core function of switching power to the compressor reliably. The lack of a stated warranty is a minor drawback but is offset by the low cost.
Homeowners looking for a straightforward budget replacement for their 24V system will find this contactor a practical choice that gets the job done quickly and efficiently.
Reliable Ampacity for Standard Loads
The 40 Amp rating ensures safe operation even under peak summer loads.
Standard Coil Voltage Compatibility
24 VAC coils match most residential HVAC control boards out of the box.
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2. 1 Pole 40 AMP Heavy Duty Enclosed AC Contactor – Best Overall Contactor
1 Pole 40 AMP Heavy Duty Enclosed AC Contactor
Enclosed Contact Design
40 Amp FLA Rating
24 Volt Coil
Universal Brand Fit
This heavy-duty enclosed contactor stands out as a top choice for reliability and ease of installation in residential HVAC systems. With a 4.7 rating, it is praised for its robust build quality and universal compatibility with leading manufacturers.
Pros
- Enclosed contacts prevent debris
- High customer satisfaction
- Compatible with major brands
- Includes replacement policy
Cons
- Slightly higher cost
- Mounting base is compact
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The enclosed contacts and encapsulated coil protect against insects and debris which is crucial for outdoor units. The 40 Amp FLA rating and 24 Volt coil ensure it meets standard requirements for most split-system air conditioners.
While it costs slightly more than basic models, the two-year replacement policy adds significant value and peace of mind. The compact mounting design may require careful alignment in tight electrical panels.
Technicians and DIYers alike will appreciate the versatility of this contactor for replacing units from Carrier, Rheem, Trane, and many other common HVAC brands.
Superior Protection Against Elements
Encapsulated coils and enclosed contacts keep bugs and dirt out of critical components.
Wide Brand Compatibility
Replaces virtually all standard 1 pole contactors used by major manufacturers.
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3. BOJACK 2 Poles FLA 40 Amp Coil 24 VAC Air Conditioner Condenser Compressor Contactor AC Definite Purpose Contactor – Best Two Pole Option
BOJACK 2 Poles FLA 40 Amp Coil 24 VAC Air Conditioner Condenser Compressor Contactor AC Definite Purpose Contactor
2 Pole Configuration
40 Amp FLA Rating
24 VAC Coil
600 VAC Max Voltage
This BOJACK 2-pole contactor provides an affordable and effective solution for systems requiring dual pole switching. It holds a strong 4.6 rating from users who need a reliable replacement without excessive cost or complexity.
Pros
- Dual pole switching
- Affordable pricing
- High voltage withstand
- Standard coil voltage
Cons
- Basic construction
- No specific warranty info
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The 40 Amp FLA rating and 600 VAC withstand voltage offer substantial headroom for standard residential loads. The 24 VAC coil ensures it works seamlessly with most standard thermostat and control board setups.
While it lacks the protective enclosure of higher-end models, it delivers the necessary switching performance for many condenser applications. The lack of specific warranty details is a minor concern given the low price point.
Homeowners with 2-pole requirements can confidently use this unit for upgrading or replacing worn contactors in their outdoor HVAC equipment.
Dual Pole for Enhanced Safety
Switches both hot lines to ensure complete power disconnect when the unit is off.
Robust Voltage Withstand
600 VAC maximum voltage rating provides safety margin for varying line conditions.
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4. Goodman Air Conditioner Contactor – Best OEM Option
Goodman Air Conditioner Contactor CONT2P030024VS – 1 Each
Factory Authorized OEM
Goodman Amana Brand
Exact Unit Fitment
Standard Specs
For owners of Goodman systems this official OEM contactor ensures a perfect match for your specific unit requirements. It carries a 4.6 rating from customers who prioritize genuine parts over aftermarket alternatives.
Pros
- Direct OEM match
- Guaranteed fit
- Factory authorized quality
- Brand specific design
Cons
- Limited to Goodman units
- Basic specs listed
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As a factory authorized product it is designed to meet the exact specifications of Goodman and Amana outdoor units. This guarantees correct mounting patterns and electrical ratings without the need for adapters.
The primary limitation is that it is tailored specifically for Goodman systems which means it is not a universal fit for other brands. However for Goodman users this is the safest and most straightforward replacement option available.
If you want absolute certainty that the part will fit and perform as intended this original equipment manufacturer option is the ideal choice.
Perfect OEM Fitment
Designed specifically for Goodman and Amana units to ensure correct dimensions and fit.
Authorized Distributor Quality
Sold through factory authorized channels to guarantee authentic product quality.
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5. Dreyoo 1 Pcs 24V Coil 40A 2 Pole Air Conditioner Contactor HVAC Contactor – Best Industrial Grade Contactor
Dreyoo 1 Pcs 24V Coil 40A 2 Pole Air Conditioner Contactor HVAC Contactor
2 Pole Design
40A FLA Rating
Hermetically Sealed
Class B Insulation
This Dreyoo contactor is engineered for industrial applications but serves as a robust upgrade for demanding residential HVAC systems. It holds a 4.7 rating for its superior build quality and sealed design that resists environmental damage.
Pros
- Hermetically sealed coil
- Dust and water resistance
- High temperature rating
- Long operational life
Cons
- Higher price
- Overkill for simple residential
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Features like a hermetically sealed coil and Class B insulation allow it to withstand harsh temperatures and humidity levels. The 40A FLA rating and dust resistance make it suitable for rooftop units or areas prone to moisture.
While it is more expensive than standard models the long operational life of over 100,000 cycles justifies the investment. For simple residential units this high level of protection might be more than strictly necessary.
Professionals looking for a durable upgrade for commercial or industrial HVAC equipment will appreciate the reliability and extensive protection offered by this model.
Sealed Against Moisture
Hermetically sealed coil prevents moisture ingress ensuring longevity in humid climates.
High Cycle Durability
Tested to withstand over 100,000 operations for long-term reliability.
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6. SunLee 2 Pole 40 Amp contactor 120v Coil UL 2 Pole Lighting Load 50 AMP Contactor Equivalent to 42CF15AF for Condenser Compressor HVAC Contactor – Best 120V Coil Option
SunLee 2 Pole 40 Amp contactor 120v Coil UL 2 Pole Lighting Load 50 AMP Contactor Equivalent to 42CF15AF for Condenser Compressor HVAC Contactor
2 Pole Switching
120 Volt Coil
Class F Insulation
40 Amp FLA
This SunLee contactor offers a 120 Volt coil option for systems that utilize higher voltage control circuits. It holds a solid 4.6 rating for its ability to replace various legacy models including Mars and Furnas units.
Pros
- 120 Volt coil option
- Higher insulation class
- Strong mechanical strength
- Broad brand replacement
Cons
- Requires 120V control
- Higher voltage coil
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The Class F 155°C coil insulation provides better thermal headroom than standard Class B materials. This allows the contactor to operate more safely under high temperature conditions common in outdoor electrical boxes.
Its bulk molding compound housing is stronger than traditional bakelite providing better resistance to vibration and impact. However the 120 Volt coil means it is not compatible with standard 24 Volt control boards.
HVAC technicians working on specific legacy systems or commercial units requiring higher voltage coils will find this model a reliable and well-built replacement solution.
Higher Insulation Class
Class F 155°C insulation withstands heat better than standard Class B insulation.
Compatible with Legacy Systems
Replaces older models like Mars 42CF15AF with equivalent performance.
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7. 2 Pole AC Contactor Generic Heavy Duty 40Amp 24V Coil – Best Basic Heavy Duty
2 Pole AC Contactor, Generic Heavy Duty 40Amp 24V Coil Air Conditioner Contactor Condenser Compressor Contactor, Definite Purpose Contactor
2 Pole Switching
40 Amp FLA
24V Coil
600 VAC Max
This generic heavy-duty contactor provides a no-nonsense solution for replacing worn contactors in 2-pole systems. It holds a 4.5 rating from users who value its essential heavy duty capabilities without extra features.
Pros
- Straightforward design
- High amp rating
- Budget friendly
- Heavy duty build
Cons
- Generic branding
- Standard features only
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The 40 Amp FLA rating and 24V coil make it a reliable fit for standard residential condenser requirements. The 600 VAC maximum rating ensures safety under normal electrical line conditions.
While it lacks specific brand guarantees it focuses on delivering the core switching function effectively. The generic nature means it is priced competitively compared to branded alternatives.
Homeowners who just need a functional replacement and do not require specific brand assurances will find this basic model a practical choice.
Functional Heavy Duty Build
Focuses on core switching capabilities to ensure reliable performance.
Competitive Pricing
Generic branding allows for a more affordable price point for replacements.
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8. C25BNB230A Contactor – Best Premium Compact Design
C25BNB230A Contactor, 2-Pole, 30 Amp, 120 VAC Coil Voltage
2 Pole Switching
30 Amp Rating
120 VAC Coil
Premium Encased
This Premium Contactors model offers a compact encased design that protects internal components from environmental stress. It holds a 4.6 rating for its build quality and ease of installation in tight spaces.
Pros
- Fully encased design
- Universal mounting plate
- Quick connect terminals
- Multiple certifications
Cons
- Higher price point
- 30 Amp limit
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The universal mounting plate simplifies replacement by eliminating the need to drill new holes. Binding head screws and quick connect terminals allow for rapid and secure electrical connections.
While the 30 Amp rating is lower than some heavy-duty options it is sufficient for smaller compressors or specific applications. The higher price is justified by the premium build and universal mounting features.
Professionals requiring a certified reliable unit for non-HVAC applications or smaller systems will appreciate the versatile design and strong protection.
Protective Encasing
Fully encased design shields internal parts from dust and environmental elements.
Universal Mounting
Mounting plate fits standard hole patterns for easier replacement of older units.
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9. 2 Pole Air Conditioner Contactor Condenser Contactor Compressor Contactor FLA 40 Amp 24V Coil – Best Value Contactor
2 Pole Air Conditioner Contactor Condenser Contactor Compressor Contactor FLA 40 Amp 24V Coil
2 Pole Configuration
40 Amp FLA
24V Coil
1/4 in Standard
This 2-pole contactor provides a reliable value option for standard air conditioning compressor control. It holds a 4.6 rating for its ease of installation and fully enclosed contacts that improve safety.
Pros
- Fully enclosed contacts
- Quick connect terminals
- Easy installation
- Solid copper points
Cons
- Basic housing material
- No premium features
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The 40 Amp FLA rating and 24V coil are standard for most residential systems. Fully enclosed contacts ensure safety by preventing accidental contact with live parts during operation.
Quick connect terminals simplify wiring while solid copper points ensure durable electrical connection. The basic housing keeps costs down without sacrificing core functionality.
Homeowners needing a straightforward replacement for their standard condenser unit will find this model a practical and cost-effective solution.
Safety Through Enclosure
Fully enclosed contacts prevent accidental touch during operation or inspection.
Easy Wiring
Standard 1/4 in terminals allow for quick and secure wire connections.
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10. EATON CUTLER HAMMER C25CNB140T COMPACT 1P W/SHUNT 40A QUAD QC 24VAC COIL – Best Premium Brand Contactor
EATON CUTLER HAMMER C25CNB140T COMPACT 1P W/SHUNT 40A QUAD QC 24VAC COIL
Premium Brand
Compact 1 Pole
24VAC Coil
Universal Mounting
This Eaton Cutler Hammer contactor represents the gold standard in reliability and build quality. It holds a perfect 5.0 rating from users who prioritize brand reputation and long-term performance.
Pros
- Top brand reputation
- Perfect 5.0 rating
- Compact encased design
- Quick connect terminals
Cons
- Highest price
- Specific model fit
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The compact encased design protects components from dust and environmental elements effectively. Universal mounting plates and quick connect terminals make installation straightforward for professionals.
The high price reflects the premium materials and brand trust associated with Eaton. While it is a significant investment it ensures minimal risk of failure for critical systems.
Professionals requiring a top-tier replacement for commercial or high-value residential systems will find this model worth the additional cost for its proven quality.
Top Brand Reliability
Trusted manufacturer known for producing high-quality electrical components.
Compact Encased Protection
Compact design protects internal parts from dust and environmental elements.
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Buying Guide – How to Choose the Best Contactor Switch for AC Units
Selecting the right contactor requires understanding your system's voltage amp rating and physical fit requirements.
Coil Voltage Compatibility
The coil voltage is the low voltage signal that activates the contactor. Most residential units use a 24 VAC coil. Always check your existing contactor for this label before ordering.
Choose a replacement that matches your existing coil voltage exactly to ensure it activates correctly with your thermostat.
FLA Amp Rating
The Full Load Amperage rating must meet or exceed the load of your compressor. A 40 Amp rating is standard for many residential systems. Lower ratings may trip or fail under heavy loads.
Ensure the new contactor's FLA rating is equal to or higher than the original specification for safe operation.
Pole Configuration
Single pole contactors switch one hot line while dual pole switches both hot lines. Check the number of terminals on your old unit to determine the correct configuration.
Match the pole count exactly to ensure the contactor fits your panel and switches power correctly.
Physical Dimensions
Contactors vary slightly in height width and mounting hole spacing. Ensure the new unit fits in your existing electrical box or enclosure.
Measure your old unit or check the mounting specs to avoid clearance issues during installation.
Contact Protection
Enclosed contacts protect against dust and insects that can cause pitting or failure. Models with encapsulated coils add extra protection for outdoor units.
Look for enclosed designs if your unit is in a dusty environment or has a history of insect damage.
Terminal Type
Terminals come as lug screws for ring terminals or quick connect tabs. Most residential units use standard quick connect tabs.
Verify the terminal type matches your existing wiring harness to avoid needing new wires or lugs.
Brand Reputation
Reputable brands often offer better quality control and longer lifespan. OEM units guarantee fit but generic brands may offer better value.
Consider reputable manufacturers if you want to minimize the risk of future replacements.
Safety Certifications
Look for UL or CSA certifications which ensure the contactor meets safety standards for use in the US and Canada.
Choose a certified contactor to ensure it complies with local electrical codes.
How to Use and Care for Your Contactor Switch for AC Units
Always turn off the power at the circuit breaker before inspecting or replacing a contactor to prevent electric shock.
Inspect the contactor monthly for signs of pitting or burning on the contacts and replace if the surface is rough.
Keep the area around the contactor clean and free of debris to prevent overheating and ensure proper airflow.
Frequently Asked Questions
What is a contactor switch in an AC unit?
A contactor switch is an electromagnetic relay that controls the flow of electricity to your compressor and condenser fan motor. It acts like a smart switch that turns these high-voltage components on and off when your thermostat calls for cooling.
How do I know which contactor to buy?
Check your existing contactor for three key numbers: voltage (usually 24V), FLA Amp rating (usually 40A), and pole count (1 or 2). Matching these ensures the new unit will fit and work with your system.
Can I use a higher Amp rating contactor?
Yes a contactor with a higher FLA Amp rating than the original is generally safe because it can handle the load. Just ensure the voltage and physical size match your existing setup.
Why does my contactor keep burning out?
Common causes include a failing compressor drawing too many amps or loose wiring causing arcing. Check your compressor's actual load with a multimeter and ensure all terminal screws are tightened securely.
Is a 24V coil standard for all ACs?
Most residential split systems use a 24V coil. However some commercial or older units may use 120V. Always verify the voltage on the old contactor coil label before ordering a replacement.
Do I need a tool to install a new contactor?
Usually a screwdriver and needle nose pliers are enough to swap a contactor. The wires clip into place so you do not need welding or complex tools for a standard replacement.
Final Thoughts on Choosing the Best Contactor Switch for AC Units
We hope this guide has helped you identify the right contactor switch for your air conditioning unit. From budget options like BOJACK to premium brands like Eaton there is a solution for every need.
When making your decision prioritize matching the voltage and amp rating to ensure safe operation. Do not overlook physical fit to avoid installation headaches.
Remember that prices and stock levels change often so check the current availability and pricing before finalizing your purchase.