XPARTCO XPC75-450R Round Run / Start Capacitor (CBB65, 7.5 MFD, 450V)
The XPARTCO XPC75-450R is a universal single run capacitor for single-phase AC motors. Unlike a dual run capacitor, which combines two capacitors into one can to serve both a compressor and a fan motor, this is a single capacitor with two terminals, sized for one motor circuit. Once a motor has started, this capacitor stays in the circuit continuously, correcting the phase of the current feeding the motor's auxiliary winding, which improves torque, efficiency, and running smoothness. This 7.5 MFD size is a very common rating for condenser fan motors, but the same CBB65-style capacitor is also widely used on pool pumps, small air compressors, washing machines, and other single-phase motor equipment.
Rated 7.5 MFD at 450VAC. Like all run capacitors, this one stores an electrical charge even after power is disconnected, and it should always be treated as energized until properly discharged. Over time, the dielectric material inside breaks down from heat and electrical stress, causing the capacitor to lose capacitance or fail outright. A failing run capacitor produces a recognizable symptom set: the motor hums but won't start, runs weakly, overheats, trips a breaker or overload protector, or the capacitor can itself becomes visibly bulged, domed, or leaks oily residue at the top.
Quick Answer
The XPARTCO XPC75-450R Round Motor Run Capacitor fixes single-phase motor equipment — condenser fan motors, pool pumps, small compressors, and similar applications — where the motor hums but won't start, runs weakly, overheats, or trips its breaker or overload protector. 7.5 MFD, 450VAC, round CBB65-style capacitor, 2 terminals. Capacitors store a dangerous electrical charge even after power is disconnected — always discharge before handling.
Common Problems This Part Fixes
- Motor hums but won't start
- Motor runs, but weakly or with reduced torque
- Motor runs hot or trips its internal overload protector
- Fan or pump won't start on its own but will run if given a manual push
- Equipment trips the circuit breaker shortly after starting
- Capacitor can visibly bulging, domed on top, or leaking oily residue
- Motor that used to start slowly and has now stopped starting altogether
Cross Reference Information
Part numbers can change over a product's lifecycle as manufacturers update designs or release new appliance models. For your convenience, we've included any known superseded, alternate, or cross-reference part numbers that match this item.
Replaces Part Numbers
XPC75-450R
This is a universal component rather than a single-manufacturer part, so the specific OEM number your equipment's label references will vary by brand. This capacitor is a correct replacement for any single run capacitor matching the 7.5 MFD rating with a voltage rating of 450V or lower. If you have your original part number, contact our support team and we will verify compatibility before you order.
Compatibility
This single run capacitor is a universal replacement compatible with single-phase AC motor equipment across all major brands, wherever the original capacitor is rated:
- 7.5 MFD
- 370V, 440V, or 450V (this capacitor's 450V rating exceeds and safely replaces either lower rating)
- Round can shape with 2 terminals
Common applications include central air conditioner and heat pump condenser fan motors, pool and spa pumps, small single-phase air compressors, and various single-phase motor equipment.
Note — single run, not dual: This is a single-motor capacitor with 2 terminals, distinct from our dual run capacitors (such as the XPDC80X5-450R and similar listings), which combine two capacitors and 3 terminals to serve both a compressor and a fan motor from one can. If your equipment's original capacitor has 3 terminals labeled C, Herm, and Fan, you need a dual capacitor instead of this single one. The MFD rating must match your original capacitor exactly; voltage rating can be equal to or higher than the original, but never lower. Always verify your original capacitor's specifications, printed on its can, before ordering. Contact our support team if you'd like help confirming compatibility.
Key Features
- Universal single run capacitor for single-phase AC motors
- 7.5 MFD rating in a compact round can — a common size for condenser fan motors and similar equipment
- 450VAC rating — a safe upgrade replacement for equipment originally speced at 370V or 440V
- Round CBB65-style can construction
- Resolves "hums but won't start," "runs weakly," "overheats," and "trips the breaker" symptoms caused by capacitor failure
- 2 quick-connect terminals for a direct plug-on fit to standard motor wiring
- 50/60Hz rated
- Built to meet or exceed industry-standard specifications for this capacitor class
Product Specifications
| Part Number |
XPC75-450R |
| Part Type |
Single Run Capacitor |
| Condition |
New — Universal Replacement Part |
| Capacitance |
7.5 MFD (µF) |
| Voltage Rating |
450VAC |
| Shape |
Round |
| Terminals |
2 (quick-connect) |
| Frequency |
50/60 Hz |
| Tolerance |
±5% |
| Construction Type |
Polypropylene film capacitor |
| Operating Temperature Range |
-40°C to 70°C (-40°F to +158°F) |
| Safety Approvals |
CQC, VDE, TÜV, CL |
| Approval Standard |
GB/T 3667, EN 60252 |
| Application |
Single-Phase AC Motors — Condenser Fans, Pool Pumps, Small Compressors |
| Quantity |
1 single run capacitor |
| Compatible Brands |
Universal — all major brands |
Installation Notes
⚠️ Danger — Capacitors Store A Dangerous Electrical Charge Shut off power to the equipment at the disconnect box and at the breaker before beginning. A capacitor stores an electrical charge even after power has been disconnected, and that charge can deliver a serious or fatal shock. Before touching either terminal, discharge the capacitor by shorting the two terminals together using an insulated-handle screwdriver, or by using a proper capacitor discharge tool with a resistor. Never short the terminals with a bare metal tool held with your bare hand. If you are not fully comfortable performing a capacitor discharge safely, have a qualified technician replace this part instead.
⚠️ Photograph The Wiring Before Disconnecting Wear work gloves and safety glasses. After confirming the capacitor is fully discharged, photograph the wiring on the old capacitor's terminals before disconnecting anything. Note which wire came from which terminal, or label them individually with tape. Remove the mounting strap or bracket holding the old capacitor in its housing, and disconnect each wire from its terminal. Install the new XPC75-450R in the same mounting position, secure it with the strap or bracket, and reconnect each wire to its matching terminal exactly as labeled. Double-check both connections before restoring power. Restore power at the breaker and disconnect box, and confirm the motor starts promptly and runs smoothly. Tools needed: insulated-handle screwdriver or capacitor discharge tool, nut driver, work gloves, safety glasses.
Frequently Asked Questions
How do I know if I need this single capacitor or a dual run capacitor?
Look at your old capacitor's terminals. If it has only 2 terminals serving one motor circuit, this single capacitor is the correct type. If it has 3 terminals labeled C, Herm, and Fan (or similar), it's a dual capacitor serving both a compressor and a fan motor from one can, and you'll need a dual capacitor such as our XPDC-series listings instead. The two types are not interchangeable.
Can I use a 450V capacitor to replace my old 370V or 440V one?
Yes. Voltage rating is a ceiling, not an exact match requirement — a capacitor rated for a higher voltage than your original will work safely and often lasts longer under the same electrical stress. What you cannot do is go the other direction: never install a capacitor with a lower voltage rating than your original, since that risks premature failure or the capacitor breaking down under normal operating conditions.
My fan or pump motor hums but won't start. Is this the capacitor?
It's one of the most common causes of exactly that symptom. A run capacitor gives the motor the extra push needed to start turning; without it working correctly, the motor can draw power and hum in place without ever actually starting to spin. If you can see the capacitor can and it looks bulged, domed on top, or is leaking a brown oily residue, that's strong visual confirmation of failure.
Is this a genuine OEM part?
This is a universal replacement part rather than a brand-specific OEM part. Because run capacitors are a standardized component defined by their electrical specifications rather than their manufacturer, this capacitor is a correct replacement for any equipment's original capacitor that shares the same 7.5 MFD, 450VAC, round rating — regardless of which brand originally installed it.
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