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Description
40+5 uF MFD 370/440 VAC Round Dual Run Capacitor Dual Run Circular Start Capacitor - For Air Conditioner, Heat Pump40+5 MFD uF 370 or 440 Volt VAC Round Dual Run Capacitor Key Features Capacitance: 40 + 5 Microfarad (MFD) Voltage Rating: 370V or 440V AC Tolerance: + 5% Frequency: 50 60 Hz Operating Temperature: 40C to +70C ( 40F to +158F) Construction: Round aluminum case Terminals: 3 terminal configuration (C, HERM, FAN) Safety Standard: 10,000 AFC fault current protection Replaces Cross Reference Part Numbers USA2235 TRCFD405 P291 4054RS C3405R C4405R 27L880
40+5 MFD uF 370 or 440 Volt VAC Round Dual Run Capacitor
Key Features
- Capacitance: 40 + 5 Microfarad (MFD)
- Voltage Rating: 370V or 440V AC
- Tolerance: +/- 5%
- Frequency: 50 / 60 Hz
- Operating Temperature: -40°C to +70°C (-40°F to +158°F)
- Construction: Round aluminum case
- Terminals: 3-terminal configuration (C, HERM, FAN)
- Safety Standard: 10,000 AFC fault current protection
Replaces / Cross-Reference Part Numbers
- USA2235
- TRCFD405
- P291-4054RS
- C3405R
- C4405R
- 27L880
- PRCFD405
- HC98JA041
Compatibility & Fitment
- Universal replacement for round dual run capacitors with matching 40/5 MFD capacitance and 370V or 440V ratings.
- A 440V capacitor can replace a 370V capacitor; do not replace a 440V capacitor with a 370V unit.
- Used in air conditioner condensers, heat pumps, and other HVAC systems.
- Physical dimensions are approximately 2.0 - 2.4 inches in diameter and 3.7 - 5.25 inches in height. Verify fitment before purchase.
When to Replace
- Outdoor unit fan does not spin.
- Compressor hums but will not start.
- HVAC system is running but not cooling.
- Visible signs of failure, such as a bulging or leaking capacitor case.
- Capacitance measures outside the specified tolerance when tested with a multimeter.
Installation Tips
- Disconnect all electrical power to the HVAC unit before servicing.
- Discharge the existing capacitor by shorting across the terminals with an insulated-handle screwdriver.
- Photograph or note the wire placement on the C, HERM, and FAN terminals before disconnecting.
- Connect the wires to the corresponding terminals on the new capacitor.
- Secure the new capacitor with the original mounting bracket to prevent vibration.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
Love them
Color: Pink & Beige, Size: Medium/Large(fits size 8 to 11)
I wear a size 11.5 in ladies shoe and these just barely fit. Butttt after I put lotion on my feet and slipped these on and left them on for about 30 mins. It left my feet really soft! They work great as intended. Would buy again
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 31, 2026
★★★★★ 3
Effective but may be uncomfortable
Color: Pink & Beige, Size: Medium/Large(fits size 8 to 11)
I have eczema on my feet and use a prescription cream that I leave on overnight. I often have a problem sleeping in socks but the silicone feels cool on my feet. The only drawback I have is the opening of the socks feel very tight around my ankles making them uncomfortable on me. I wish the opening was a bit more flexible.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 20, 2025
★★★★★ 1
Burned my already sensitive feet, too big
Color: Pink & Beige, Size: Medium/Large(fits size 8 to 11)
Feels icky, and the heat gets trapped and literally felt like my feet were being burned by these. The bottoms of these feel prickly and they are way too big. You have to sit still and cannot walk in them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
★★★★★ 5
Just as good as paraffin wax
Color: Pink & Beige, Size: Medium/Large(fits size 8 to 11)
I might prefer these socks over paraffin wax. They are comfy and very moisturizing. I use these socks once a week to keep the heels and soles of my feet moisturized between pedicures. I rinse with warm, soapy water then hang to dry. They are hard to walk in, but there's a saying printed in the socks that's says something to the effect of "take a break, stay off your feet" lol I love that as a reminder to put my feet up and relax
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
★★★★★ 5
Love these!
Color: Pink & Beige, Size: Small(fits up to size 7)
Love these! As I write this review, I’m sitting in my recliner with these on. I have had other silicone socks in the past and would like to share a few of the things that I have learned.
These fit great! The others were 2-3 sizes too big because you could not order a size. I wear a size 7 women’s shoe. I got the smaller size. I walked around my apartment in my old ones and they got kinda yucky. Now, I sit in my recliner, put them on and chill for a few hours. I now take them off and put in a ziplock bag so they stay nice and clean (no cat hair!). I use them once a week usually on Saturday or Sunday as I’m a working girl. Also, I use Auqaphor before I put them on and put cotton socks on after I’m finished. Your feet will be SO soft. This is not a one and done…I do this every week especially during sandal season! I know this was lengthy and I hope you got some tips.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 25, 2026
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