XPARTCO HVAC Capacitor Contractor Pack — 18-Piece Assortment Kit (Dual + Single Run)
The XPARTCO HVAC Capacitor Contractor Pack bundles the seven most commonly needed dual run capacitor ratings, plus two single run capacitor ratings, into a single 18-piece kit, so a technician can carry one box instead of restocking capacitors between jobs. Each dual run capacitor combines two capacitors into one round, three-terminal can — one rated for the compressor, one for the condenser fan motor — the standard design used across the vast majority of residential and light commercial split systems, window units, and heat pumps. The single run capacitors are 2-terminal units sized for one motor circuit, commonly used on standalone condenser fan motors, pool pumps, and other single-phase motor equipment.
The mix in this kit is weighted toward the ratings that fail most often in the field: 35/5, 40/5, and 45/5 MFD capacitors cover the majority of residential 1.5–3.5 ton systems and are included in higher quantities, while 50/5, 60/5, 70/5, and 80/5 MFD round out coverage for larger residential and light commercial compressors. All fourteen capacitors are rated 450VAC, so each one is a safe upgrade replacement regardless of whether the original equipment was speced at 370V, 440V, or 450V.
Quick Answer
The XPARTCO HVAC Capacitor Contractor Pack is an 18-piece assortment covering the seven dual run capacitor ratings most commonly replaced on residential and light commercial AC systems and heat pumps, plus two single run capacitor ratings for fan motors and similar equipment: 35/5 (×2), 40/5 (×4), 45/5 (×4), 50/5 (×1), 60/5 (×1), 70/5 (×1), 80/5 (×1), single-run 5 (×2), and single-run 7.5 (×2) MFD, all rated 450VAC, round. Built for technicians who want to stock a truck once instead of reordering capacitors mid-week. Capacitors store a dangerous electrical charge even after power is disconnected — always discharge before handling.
What's In The Kit
| Capacitor Rating |
Qty |
Typical Application |
| 35/5 MFD, 450V, Round |
2 |
Smaller residential split systems, window/PTAC units |
| 40/5 MFD, 450V, Round |
4 |
Common residential 2–2.5 ton systems — high-frequency replacement size |
| 45/5 MFD, 450V, Round |
4 |
Common residential 2.5–3 ton systems — high-frequency replacement size |
| 50/5 MFD, 450V, Round |
1 |
Mid-size residential systems, 3–3.5 ton |
| 60/5 MFD, 450V, Round |
1 |
Larger residential systems, 3.5–4 ton |
| 70/5 MFD, 450V, Round |
1 |
Larger residential/light commercial systems, 4–5 ton |
| 80/5 MFD, 450V, Round |
1 |
Larger compressors and light commercial equipment |
| 5 MFD, 450V, Round (Single Run) |
2 |
Standalone condenser fan motors, pool pumps, small single-phase motors |
| 7.5 MFD, 450V, Round (Single Run) |
2 |
Standalone condenser fan motors, pool pumps, small single-phase motors |
Common Problems This Kit Solves
- Outdoor AC unit hums but the compressor won't start
- Condenser fan won't spin, or spins slowly and needs a manual push to get going
- System trips the breaker shortly after starting
- AC blows warm air because the compressor isn't running
- Repeated clicking sound from the contactor as it tries and fails to start the motor
- Capacitor can visibly bulging, domed on top, or leaking oily residue
- Needing a specific capacitor rating on the spot without a return trip to the supply house
Compatibility
This kit's capacitors are universal replacements compatible with central air conditioners, heat pumps, and condensing units across all major HVAC brands, wherever the original capacitor's MFD rating matches one included in this kit and its voltage rating is 450V or lower (370V and 440V equipment included, since a higher voltage rating is always a safe upgrade).
Note: The MFD (microfarad) rating must match the original capacitor exactly on both the compressor and fan sides — do not substitute a different MFD value. If a job calls for a rating not included in this kit (such as a 25/5, 30/5, or 55/5), each individual dual run capacitor rating is also available separately in our HVAC capacitor line. Contact our support team if you'd like help confirming which rating a specific job needs.
Key Features
- 18-piece assortment covering the 7 most commonly replaced dual run ratings plus 2 single run ratings
- Quantities weighted toward the highest-frequency replacement sizes (35/5, 40/5, 45/5)
- All capacitors rated 450VAC — a safe upgrade for equipment originally speced at 370V or 440V
- Round can construction — 3-terminal (C, Herm, Fan) dual run capacitors and 2-terminal single run capacitors
- Polypropylene film construction; safety approved CQC, VDE, TÜV, CL; built to GB/T 3667 and EN 60252 standards
- Operating temperature range -40°C to 70°C (-40°F to +158°F)
- Eliminates truck-stock gaps — one kit replaces reordering single capacitors between jobs
- Each rating also available individually for restocking a single value
Kit Specifications
| Kit Contents |
18 capacitors — 14 dual run across 7 ratings + 4 single run across 2 ratings (see table above) |
| Capacitor Types |
Dual Run (Compressor + Fan) and Single Run |
| Condition |
New — Universal Replacement Parts |
| Voltage Rating (all pieces) |
450VAC |
| Shape |
Round |
| Terminals |
3 per dual run capacitor / 2 per single run capacitor (1/4" 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 |
Central Air Conditioners, Heat Pumps, Condensing Units |
| Compatible Brands |
Universal — all major HVAC brands |
Installation Notes
⚠️ Danger — Capacitors Store A Dangerous Electrical Charge Shut off power to the outdoor unit at the disconnect box and at the breaker before beginning any capacitor replacement. A capacitor stores an electrical charge even after power has been disconnected, and that charge can deliver a serious or fatal shock. Before touching any terminal, discharge the capacitor fully: on a dual run capacitor, short each pair of terminals together (C-to-Fan, C-to-Herm, and Fan-to-Herm); on a single run capacitor, short the two terminals together. Use an insulated-handle screwdriver, or a proper capacitor discharge tool with a resistor. Never short the terminals with a bare metal tool held with your bare hand.
⚠️ Match The Rating Before Installing — Photograph Wiring First Confirm the failed capacitor's MFD rating on both the compressor and fan sides, and select the matching piece from this kit — the rating printed on the old capacitor's can is the reference, not the equipment's tonnage. Photograph the wiring on the old capacitor's terminals before disconnecting anything; terminals are typically labeled C (Common), Herm or Comp (compressor), and Fan. Remove the mounting strap holding the old capacitor, disconnect each wire, and install the replacement from this kit in the same mounting position, reconnecting each wire to the matching terminal. Restore power and confirm the compressor and fan both start promptly and run smoothly. Tools needed: insulated-handle screwdriver or capacitor discharge tool, nut driver, work gloves, safety glasses.
Frequently Asked Questions
Why are 35/5, 40/5, and 45/5 included in higher quantities than the others?
These three ratings cover the size range used on the largest share of residential split systems in the field, so they're the ratings most likely to come up repeatedly across a week of service calls. The larger ratings (50/5 through 80/5) still come up regularly but less often, which is why the kit includes one of each rather than duplicates.
What if a job needs a rating that isn't in this kit, like 25/5 or 55/5?
Every rating in this kit — both dual run and single run — is also sold individually, so you can pick up less common values as needed without buying another full kit. Contact our support team if you want help identifying which individual rating a specific job calls for.
Can I use a 450V capacitor from this kit to replace an original 370V or 440V capacitor?
Yes. Voltage rating is a ceiling, not an exact match requirement — a capacitor rated for a higher voltage than the original works safely and often lasts longer under the same electrical stress. What you can't do is go the other direction, so every capacitor in this kit being 450V means it's a safe fit anywhere the original was rated 370V, 440V, or 450V.
Does the MFD rating need to match exactly, or is there some tolerance?
Match the rating on both the compressor and fan side as closely as possible to the original — these capacitors carry a ±5% manufacturing tolerance, but that's not the same as intentionally substituting a different rated value. Always select the kit piece whose printed MFD rating matches what was on the failed capacitor.
Is this a genuine OEM kit?
This is a universal replacement kit rather than a brand-specific OEM product. Because dual run capacitors are a standardized component defined by their electrical specifications rather than their manufacturer, each capacitor in this kit is a correct replacement for any unit's original capacitor sharing the same rating — regardless of which HVAC brand originally installed it.
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