Liftmaster K030B0415, CAPACITOR, 12.5UF, 450V
The LiftMaster K030B0415 is a 12.5uF, 450V capacitor used in select LiftMaster and Chamberlain residential garage door openers. In compatible AC opener motors, the capacitor helps the motor start and run with the proper electrical characteristics.
A failing capacitor can cause the opener motor to hum, start slowly, stall under load, run intermittently, or fail to start even when the door is properly balanced. However, the same symptoms can also come from a bad motor, weak board relay, binding door, worn drive gear, or incorrect force setting.
Capacitor selection must be exact. Match the microfarad rating, voltage rating, connector type, and parts diagram. Do not substitute a capacitor with a different uF rating unless the manufacturer documentation specifically allows it.
Features & Specifications
| Manufacturer | LiftMaster / Chamberlain Group |
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| Product Type | Motor capacitor |
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| Part Number | K030B0415 |
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| Capacitance | 12.5uF |
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| Voltage | 450V |
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| Application | Motor start/run capacitor for select residential garage door openers |
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| Compatible Operator Type | Select LiftMaster and Chamberlain garage door openers |
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| Notes | Electrical part; match rating and wiring before installation |
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Compatible With
Compatible with select LiftMaster and Chamberlain garage door openers that specify a 12.5uF 450V capacitor. Common application notes include:
- Various LiftMaster residential belt drive garage door openers using K030B0415
- Various LiftMaster residential chain drive garage door openers using K030B0415
- Various Chamberlain residential belt drive garage door openers using 030B0415 / 30B415
- Various Chamberlain residential chain drive garage door openers using 030B0415 / 30B415
- Select 1/2 HP AC-powered opener applications where the parts diagram confirms this capacitor rating
Also Known As / Related Part Numbers
- K030B0415
- 030B0415
- 30B415
- 12.5uF 450V capacitor
- LiftMaster 12.5uF capacitor
- Chamberlain 12.5uF capacitor
Technician Note
A capacitor can hold a charge after power is removed. If you are not trained to handle opener electrical parts, have a qualified technician perform the diagnosis and replacement.
Before Ordering Checklist
- Match the old capacitor rating: 12.5uF and 450V.
- Confirm the parts diagram lists K030B0415, 030B0415, or 30B415.
- Inspect for swollen case, leakage, burnt smell, or damaged terminals.
- Check door balance before assuming the capacitor is the only problem.
- Do not install a different uF rating as a guess.
Professional Advisory
Capacitor replacement involves electrical components. Disconnect power and use a qualified garage door technician if wiring, motor testing, or capacitor discharge is required.
Important Ordering Warnings
- Electrical part - do not handle energized wiring.
- Incorrect capacitor rating can damage the motor or cause unreliable operation.
Product Questions & Answers
What is the rating of K030B0415?
K030B0415 is commonly listed as a 12.5uF, 450V capacitor.
What symptoms can this capacitor fix?
It may help when a compatible opener motor hums, struggles to start, or runs weakly, but the door, motor, board, and drive system should also be checked.
Can I use a higher or lower uF capacitor?
No. Match the manufacturer-specified microfarad rating. The wrong uF rating can create motor problems.
Are 30B415 and K030B0415 related?
Yes. 30B415 and 030B0415 are common related numbers for K030B0415.
Is this safe for a homeowner to replace?
Only if the person is comfortable with electrical service and capacitor safety. Otherwise, a qualified technician should handle it.
