U.S. Seal BC-124 Motor Start Capacitor | 124-149 MFD
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Reliable Motor Starting + Exact 124-149 MFD Replacement Range
- U.S. Seal motor start capacitor for compatible pool and spa pump motors
- 124-149 MFD capacitance range
- 115V start-capacitor class in the U.S. Seal product catalog
- Designed to provide the temporary starting boost used by compatible single-phase motors
- Round replacement capacitor commonly supplied in a compact plastic case
- Exact part number BC-124 helps simplify service identification
The U.S. Seal BC-124 Motor Start Capacitor is a replacement starting capacitor for compatible electric motors used in pool, spa, and related equipment. U.S. Seal lists BC-124 in its start-capacitor line with a capacitance range of 124-149 MFD and within its 115V start-capacitor series.
A start capacitor provides a temporary electrical boost when the motor begins turning. Once the motor reaches operating speed, the start circuit removes the capacitor from the circuit. Because start capacitors are selected by electrical specification, BC-124 should only be used when the motor manufacturer, service data, or original capacitor calls for the same appropriate capacitance and voltage class.
Best For
- Replacing an existing BC-124 start capacitor
- Pool or spa pump motor service where 124-149 MFD is specified
- Repairing a motor that has been correctly diagnosed with a failed start capacitor
- Matching an original start capacitor by electrical rating and physical fit
Why This Part Matters
A failed start capacitor can prevent a compatible motor from developing the starting torque it needs. Symptoms can include humming without starting, slow or inconsistent startup, or a motor that trips protection during startup. These symptoms can also be caused by other motor or pump problems, so the capacitor should be tested and the motor specifications verified before replacement.
Common Signs to Inspect the Start Capacitor
- Motor hums but does not begin turning
- Motor has difficulty starting after power is applied
- Capacitor case is swollen, cracked, leaking, or visibly damaged
- Electrical testing identifies an out-of-spec start capacitor
- The original capacitor is marked for the 124-149 MFD range
Product Specifications
| Brand | U.S. Seal |
|---|---|
| Product Type | Motor Start Capacitor |
| Manufacturer Part Number | BC-124 |
| Capacitance | 124-149 MFD |
| Voltage Class | 115V start-capacitor series |
| Frequency | 50/60 Hz |
| Shape | Round |
| Approximate Diameter | 1-7/16 in. |
| Approximate Height | 2-3/4 in. |
| Application | Compatible single-phase motor starting circuits |
Compatibility & Fitment Notes
BC-124 is not a universal replacement for every pool pump motor. Match the original capacitor or motor service information for capacitance, voltage rating, physical size, terminal arrangement, and start-capacitor type. Do not select a replacement solely by pump horsepower, brand, or physical appearance.
Installation & Safety Notes
Motor capacitors can retain an electrical charge even after power has been disconnected. Disconnect and verify power before service, and follow the motor manufacturer's current procedure for safely discharging, testing, and replacing the capacitor. If you are not trained to work on motor electrical components, have a qualified pool-equipment or electrical technician perform the repair.
Buy with Confidence
Benchmark Pool Supply helps customers match motor capacitors by part number and electrical specification. Before ordering BC-124, verify that the motor or original start capacitor calls for the 124-149 MFD range and the appropriate voltage class.
Frequently Asked Questions
What is the capacitance rating of U.S. Seal BC-124?
U.S. Seal lists BC-124 as a 124-149 MFD motor start capacitor.
Is BC-124 a start capacitor or a run capacitor?
BC-124 is a start capacitor. It is used temporarily during motor startup and is not a substitute for a continuous-duty run capacitor.
Will BC-124 fit my pool pump motor?
Only if the motor manufacturer or original capacitor specifies the compatible 124-149 MFD range and appropriate voltage class. Match the electrical specifications and physical fit before ordering.
Can I choose a capacitor only by motor horsepower?
No. Capacitor selection should be based on the motor or original capacitor specifications, including capacitance, voltage rating, capacitor type, and physical fit.
Should a motor capacitor be professionally installed?
Professional service is recommended if you are not trained in motor electrical work. Capacitors can retain a dangerous electrical charge after power is disconnected and must be handled using the correct safety procedure.
