Siemens Brand 5 uF MFD ±5% 370/440 VAC Oval Run Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump - Replaces 97F5705
5 uF 370/440 VAC oval run start capacitor with dual terminals for AC motor and fan applications.
Four-step installation guide for 5 uF 370/440 VAC AC motor run capacitor showing power shutoff and wiring replacement.
Infographic showing two 5 uF 370/440 VAC oval run capacitors and signs indicating when to replace an AC capacitor.
BlueStars 5 uF 370/440 VAC oval run capacitor for AC motor and heat pump systems.
5 uF 370/440 VAC oval run capacitor with dimensions diagram showing side and top views.
Infographic showing technical specifications for a 5 uF 370/440 VAC oval run capacitor.
Diagram showing the 2-terminal layout of a 5 uF oval run capacitor with Common, Fan, and Compressor terminal labels.
BlueStars 5 uF 370/440 VAC oval run capacitor showing metalized film construction and aluminum case details.
Educational infographic showing how to choose a 5 uF 370/440 VAC oval run start capacitor for AC and fan motors.
Technician installing a 5 uF 370/440 VAC oval run start capacitor in an AC unit.
Infographic showing 5uF capacitor applications for AC, refrigerator, heat pump, and compressor motor start-up.
5 uF 370/440 VAC oval run start capacitor for AC motor and heat pump repair.
5 uF 370/440 VAC oval run start capacitor with dual terminals for AC motor and fan applications.
Four-step installation guide for 5 uF 370/440 VAC AC motor run capacitor showing power shutoff and wiring replacement.
Infographic showing two 5 uF 370/440 VAC oval run capacitors and signs indicating when to replace an AC capacitor.
BlueStars 5 uF 370/440 VAC oval run capacitor for AC motor and heat pump systems.
5 uF 370/440 VAC oval run capacitor with dimensions diagram showing side and top views.
Infographic showing technical specifications for a 5 uF 370/440 VAC oval run capacitor.
Diagram showing the 2-terminal layout of a 5 uF oval run capacitor with Common, Fan, and Compressor terminal labels.
BlueStars 5 uF 370/440 VAC oval run capacitor showing metalized film construction and aluminum case details.
Educational infographic showing how to choose a 5 uF 370/440 VAC oval run start capacitor for AC and fan motors.
Technician installing a 5 uF 370/440 VAC oval run start capacitor in an AC unit.
Infographic showing 5uF capacitor applications for AC, refrigerator, heat pump, and compressor motor start-up.
5 uF 370/440 VAC oval run start capacitor for AC motor and heat pump repair.
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5 uF MFD ±5% 370/440 VAC Oval Run Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump - Replaces 97F5705

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5uF MFD ±5% 370-440VAC Oval Run Start Capacitor

Key Features

  • Capacitance: 5 MFD / uF
  • Tolerance: ±5%
  • Voltage Rating: 370V / 440V AC
  • Frequency: 50 / 60 Hz
  • Shape: Oval
  • Construction: Metal case, oil-filled for heat dissipation
  • Terminals: 1/4 inch male quick-connect
  • Safety Standard: UL recognized
  • Operating Temperature: -40°C to +70°C

Replaces / Cross-Reference Part Numbers

  • Replaces any oval-shaped 5 MFD capacitor with either a 370VAC or 440VAC rating.
  • Compatible replacement for CBB65 type capacitors with matching specifications.
  • Interchangeable with capacitors from brands such as Aerovox, TEMCo, ClimaTek, and others meeting the same MFD and voltage ratings.

Compatibility & Fitment

  • Designed for continuous duty in single and three-phase AC motor applications.
  • Commonly used in:
    • Air conditioner condenser fan motors
    • Furnace blower motors
    • Heat pumps
    • Pool and spa pumps
    • Compressors
  • Physical Dimensions: 2.0 in Width x 2.5 in Height x 1.25 in Depth (approximate case size).

When to Replace

  • Motor produces a humming sound but fails to start.
  • The capacitor case is visibly swollen, bulging, or leaking fluid.
  • Capacitance measures outside the rated tolerance (below 4.75 uF or above 5.25 uF) when tested with a multimeter.

Installation Tips

  • Disconnect all electrical power to the equipment before beginning work.
  • Safely discharge the existing capacitor by shorting the terminals with a resistor or an insulated tool.
  • Confirm the uF (MFD) rating and voltage of the new capacitor match the component being replaced.
  • Note the wiring configuration before disconnecting the old part.
  • Ensure all electrical connections are tight and secure after installation.
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  • Step 1

    Step 1

    Turn off the power and locate the capacitor
  • Step 2

    Step 2

    Discharge any stored electricity by shorting the terminals
  • Step 3

    Step 3

    Take a photo or note how the wires connect. Disconnect wires & install the new capacitor.
  • Step 4

    Step 4

    Reassemble and test

FAQ

This unit is a direct replacement for the 97F5705 capacitor. It is compatible with systems requiring a 5 uF, 370/440 VAC oval run capacitor.
Common signs of failure include a motor that hums but won't start, a fan that requires a manual push to begin spinning, or a noticeable decrease in fan speed. If the top of the capacitor is domed or bulging, or if you smell a burnt odor near the electrical compartment, the capacitor has likely failed and requires replacement.
Yes. A capacitor rated for 440V can safely replace a 370V capacitor of the same microfarad (uF) rating. The voltage rating indicates the maximum voltage the capacitor can handle; using a higher voltage rating provides a greater safety margin and often results in a longer service life.
Installation typically takes 15 to 30 minutes. You will need a screwdriver to access the electrical panel, a pair of insulated needle-nose pliers to remove the spade connectors, and a multimeter capable of measuring capacitance to verify the old part is faulty. Always ensure the power is disconnected at the breaker before beginning work.
Before removing the old capacitor, take a photo of the wiring connections to ensure the new one is wired identically. Because capacitors store an electrical charge even when the power is off, you must discharge the old capacitor by touching the terminals with an insulated-handle screwdriver across the contacts before handling it.
The ±5% tolerance rating ensures that the actual capacitance is within 5% of the stated 5 uF value. This precision is important for maintaining the correct phase shift for your motor, which ensures it runs at the intended efficiency and torque levels.