Buck 35+5uF 35/5 MFD CBB65B Dual Run Capacitor - Reliable HVAC

In this review the Buck 35+5uF dual run capacitor is examined as a direct replacement part for HVAC systems, air conditioner fan motors, heat pumps, and condensers. The single biggest reason to buy is its straightforward compatibility and safety features: labeled terminals make installation simple and the incorporated 10000 AFC Anti-Explosion Pressure Switch with S1 safety standards offers extra peace of mind for users replacing a failed start or run capacitor. This review is written for homeowners and technicians seeking a compact, American-made replacement that fits many common model numbers.

Key Features

• Dual Capacitance: Provides both 35uF and 5uF values in one unit, allowing it to serve compressor start and fan functions without needing two separate capacitors.
• Clear Terminal Labels: Labeled Herm/H, Fan/F and C terminals reduce installation errors and speed up replacement for service techs and DIYers.
• Wide Operating Range: Rated from -40C to 70C (-104F to 158F), it is suitable for systems in varied climates and seasonal extremes.
• Compact Size: At 5 in height and 2 in diameter the round body fits many condenser housings where space is limited.
• Advanced Safety Design: Built to S1 safety standards and fitted with a 10000 AFC Anti-Explosion Pressure Switch to help contain failures and enhance operator safety.
• Standards Compliance: Meets EIA-456-A and IEC 60252-1:2001, which helps ensure predictable electrical performance in HVAC applications.

Who It's For

This capacitor is best for HVAC technicians, contractors and experienced DIY homeowners replacing a failed dual run capacitor in air conditioners, heat pumps or straight cool condensers that require a 35/5uF 370/440VAC part. Its compatibility list and labeled terminals make it a convenient swap for many common OEM references.

Those who should look elsewhere include owners who need a capacitor with unusually high mechanical robustness for industrial vibration-heavy environments, or buyers wanting an extended warranty beyond typical replacement parts; some users reported short service life in certain installations, so mission-critical applications may warrant a higher-grade industrial spec unit.

Pros & Cons

Pros

• Directly replaceable with labeled terminals for faster, less error-prone installation.
• Includes a 10000 AFC Anti-Explosion Pressure Switch and S1 safety features for added protection.
• Wide temperature range makes it suitable for most residential and light commercial climates.
• Compatible with many OEM reference numbers, simplifying part selection for common models.

Cons

• Some customers reported inconsistent long-term durability, with failures under 15 months in a few cases.
• Not marketed as a heavy industrial heavy-duty capacitor for extreme vibration or continuous heavy cycling environments.

Specifications

Capacitance	35+5uF
Voltage Rating	370/440VAC
Frequency	50/60Hz
Operating Temperature	-40C to 70C (-104F to 158F)
Dimensions	Height 5 in, Diameter 2 in
Standards	EIA-456-A, IEC 60252-1:2001
Safety Feature	10000 AFC Anti-Explosion Pressure Switch, S1

Our Verdict

The Buck 35+5uF dual run capacitor is a practical, value-oriented replacement for many residential and light commercial HVAC systems because of its labeled terminals, broad compatibility and built-in safety measures. It represents good value for routine repairs, though buyers who need guaranteed long-term durability in demanding installations may prefer a heavy-duty industrial spec part.

Frequently Asked Questions

Is this capacitor a direct fit for common HVAC models?
Yes, it lists many compatible reference numbers and has labeled Herm/H, Fan/F and C terminals to simplify direct replacement in many units.

What temperature range will this capacitor tolerate?
It is rated from -40C to 70C (-104F to 158F), suitable for most residential and light commercial environments.

Does it include any safety features?
Yes, it incorporates S1 safety standards and a 10000 AFC Anti-Explosion Pressure Switch to reduce the risk of catastrophic failure.