TEMCo 540-648 uF/MFD 110-125 VAC Round Start Capacitor - Lot of 5

In this review of the TEMCo 540-648 uF/MFD 110-125 VAC round start capacitor, the bottom line is simple: this is a no-frills replacement component aimed at technicians and hobbyists who need dependable start capacitance for single-phase motors. The reviewer found the capacitors to provide consistent starting assist for compatible HVAC and compressor motors, and the lot packaging of five makes it convenient for small shops or projects. The focus here is reliability and correct electrical spec rather than cosmetics, so buyers should expect functional parts that match the stated capacitance and voltage range.

Key Features

• The 540-648 uF/MFD rating supplies the necessary stored energy to improve motor starting torque on many single-phase AC motors.
• Rated for 110-125 VAC at 50/60 Hz, these capacitors fit common residential and light commercial motor circuits within that supply band.
• The round start form factor is compatible with equipment designed for cylindrical start capacitors, easing physical replacement.
• Sold as a lot of five units, which reduces procurement time for shops and provides spares for future maintenance.
• The TEMCo Industrial branding indicates the parts are intended for technical or repair use rather than consumer electronics applications.

Who It's For

The TEMCo 540-648 uF start capacitor is best suited to HVAC technicians, electrical maintenance professionals, and do-it-yourselfers who work on single-phase motors that require a high-value start capacitor. Buying in a lot of five makes it practical for small service shops or installers who often replace failed start components.

It is less appropriate for applications outside the stated voltage or frequency range, or where a run capacitor or different capacitance tolerance is required. If the motor or equipment manual specifies a different form factor or exact tolerance, users should verify compatibility before replacing parts.

Pros & Cons

Pros

• Provides the high starting capacitance needed to assist single-phase motor startup in many HVAC and compressor systems.
• 110-125 VAC rating covers a common residential and light commercial supply range, simplifying replacements.
• Lot of five offers good value and convenience for maintenance shops or multi-unit servicing.

Cons

• Limited information on tolerance and physical dimensions in the source means installers must confirm fit and exact specs against the existing capacitor.

Specifications

Brand	TEMCo Industrial
Capacitance	540-648 uF/MFD
Voltage Rating	110-125 VAC
Frequency	50/60 Hz
Style	Round start capacitor
Quantity	Lot of 5

Our Verdict

For technicians and hobbyists who need reliable start capacitors for single-phase motors, this TEMCo lot delivers practical value and the correct electrical range for many common service tasks. Confirm physical mounting and tolerance requirements before installation, but for straightforward replacements the five-pack is a sensible, cost-effective option.

Frequently Asked Questions

Can these capacitors be used on both 50 Hz and 60 Hz equipment?
Yes, the 50/60 Hz rating means they are suitable for equipment operating at either frequency within the stated voltage range.

Are these capacitors intended as run capacitors?
No, these are round start capacitors designed to assist motor startup; they are not specified as run capacitors for continuous operation.

How many units come in the package?
The product is sold as a lot of five identical capacitors, which is convenient for multiple repairs or spare parts.