124-149µF 250V AC Motor Start Capacitor
Part Number: MS250V124-149
124-149µF • 250V AC • 85°C • Motor Capacitor
Capacitance
124-149µF
Voltage
250V AC
Tolerance
±±20%
Temp Rating
85°C
Mounting
screw
Dielectric
electrolytic
$27.45 each × 1
About the 124-149µF 250V AC Motor Start Capacitor
Motor Start capacitor for HVAC, compressors, and motors. 124-149µF, 250V AC.
Applications for 124-149µF 250V AC Motor Capacitors
Typical design scenarios where the MS250V124-149 (124-149µF / 250V AC) is specified:
Motor Drives & VFDs
DC bus filtering for variable-frequency drives operating at 250V AC bus voltage with 124-149µF bulk storage
UPS & Power Supplies
Energy hold-up and output filtering in uninterruptible power supplies and high-voltage DC-DC converters
Power Capacitor Banks
High-current bus bars in industrial inverters, regenerative drives, and capacitor bank assemblies
HVAC & Motor Systems
Single-phase motor start/run, compressor circuits, and fan motors in commercial HVAC equipment
Need a Replacement for MS250V124-149?
124-149µF · 250V AC · screw
Our engineers can cross-reference this part to find a compatible replacement that meets or exceeds the original specifications — with full CoC and traceability documentation.
Technical Specifications
Complete specifications for MS250V124-149
Why Choose This Motor Capacitor?
- 250V AC voltage rating with recommended 20% derating for maximum service life in power circuits
- Part of the MS series — cross-reference available for equivalent parts from other manufacturers
- 100% electrically tested before shipment for guaranteed in-spec performance
- Ships same-day from US warehouse when ordered before 3 PM EST
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Our capacitor specialists can help with selection, cross-reference, and application questions.
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Looking for an Equivalent?
We can help cross-reference MS250V124-149 with alternative part numbers.
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Frequently Asked Questions
Common questions about MS250V124-149 and motor capacitors
What applications use a 124-149µF 250V AC motor capacitor?
A 124-149µF 250V AC motor capacitor is commonly used in VFD DC bus filtering, UPS energy storage, industrial power supplies, and welding equipment. The high voltage and capacitance combination provides the energy storage needed for power conversion stages operating from rectified mains or three-phase supplies.
Can the MS250V124-149 handle high-temperature environments?
The MS250V124-149 is rated for 85°C, which covers standard commercial and light-industrial environments. For installations in enclosed cabinets or hot climates where ambient temperatures exceed 65°C, consider selecting a 105°C-rated alternative for additional thermal margin.
What torque specification should I use for the MS250V124-149 screw terminals?
Use the torque value specified in the manufacturer datasheet — typically 1.5–2.5 N·m for M5 terminals and 0.8–1.2 N·m for M4 terminals. Over-torquing can crack the terminal seal and allow electrolyte leakage. Use star washers for vibration resistance and re-torque connections after 24 hours of initial thermal cycling in the target application.
What capacitors can replace the MS250V124-149?
Cross-referencing the MS250V124-149 requires matching capacitance (124-149µF), voltage (250V AC), temperature rating (85°C), and physical dimensions. ESR and ripple current ratings must also meet or exceed the original spec for reliable operation. Contact our technical team at 800-731-1433 for verified cross-reference options — we maintain compatibility data across major manufacturers.
Should I derate the voltage when using the MS250V124-149?
Yes. Industry best practice is to operate capacitors at 60–80% of their rated voltage. For the MS250V124-149 rated at 250V AC, this means designing your circuit to keep the applied voltage below 200V under all conditions including transients. Voltage derating significantly extends capacitor life — each 10% reduction in applied voltage can roughly double the expected service life for electrolytic types.
What is the lead time for the MS250V124-149?
In-stock items ship same-day when ordered before 3 PM EST, with standard delivery of 2–5 business days within the continental US. If the MS250V124-149 shows as out of stock, our sourcing team can typically locate high-voltage motor capacitors within 1–2 weeks through our manufacturer and distributor network. Contact us for expedited options or large-quantity pricing.
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