Overview
The Cornell Dubilier SFB40S10L278K is a Type SF motor-run and power-supply capacitor designed for AC induction motors, compressors, and HVAC equipment. This capacitor provides stable capacitance to maintain efficient motor operation across demanding industrial applications. The unit features a steel case for durability and is rated for continuous AC operation at 440V with 10µF capacitance and ±10% tolerance.
Key Features
- 10µF capacitance rated for 440V AC operation
- Steel case construction for mechanical protection and durability
- Motor-run rated for continuous duty in HVAC and industrial motor circuits
- ±10% capacitance tolerance per Cornell Dubilier SF series standards
- Designed for 60 Hz operation in single-phase AC systems
- 1½” oval case form factor with fork-style terminals
Technical Specifications
- Part Number: SFB40S10L278K
- Series: SF Motor-Run and Power Supply
- Capacitance: 10 µF
- Voltage Rating: 440 Vac
- Tolerance: ±10% (K rating)
- Case Material: Steel with cover
- Case Style: 1½” Oval
- Terminal Type: Fork lugs
- Operating Frequency: 60 Hz
- Height: 2.78 inches
- Service Life Objective: 60,000 hours at rated conditions (per SF series specs)
- Manufacturer: Cornell Dubilier Electronics (CDE)
Typical Applications
- HVAC compressor motor start and run circuits
- Industrial AC induction motor power factor correction
- Refrigeration equipment capacitor replacement
- Single-phase motor run capacitor duty
- Power supply filtering in motor control circuits
Compatibility & Replacements
Compatible With
- Single-phase AC induction motors (440V, 60 Hz)
- HVAC compressor units and condensing fans
- Motor control circuits requiring AC run capacitors
- Equipment designed for 440V 3-phase or single-phase AC systems
- Industrial motor soft-start and power supply applications
Replaces / Drop-In Replacement For
Verify compatibility with your equipment manufacturer or system integrator before ordering. The SFB40S10L278K replaces other Cornell Dubilier SF-series capacitors with identical electrical specifications (10µF, 440V, ±10% tolerance). Common replacements from the SF family use the same voltage and capacitance ratings.
Works With
- HVAC control systems (single-phase motor circuits)
- AC motor soft-start and variable frequency drive (VFD) input filters
- Industrial power supply conditioning circuits
- Motor protection relay and contactor circuits
- Standard 440V 60 Hz AC power systems
