Siemens Brand 50+10 uF MFD ±5% 370/440 VAC CBB65B Dual Run Start Round Capacitor - Fits Condenser, Heat Pump
50+10 uF 370/440 VAC CBB65B dual run round capacitor for condenser and heat pump units.
Step-by-step installation guide for 50+10 uF dual run capacitor in AC condenser and heat pump units.
Infographic showing when to replace a 50+10 uF dual run start capacitor for AC condenser and heat pump units.
50+10 uF CBB65B dual run capacitor for AC condenser and heat pump units.
50+10 uF CBB65B dual run capacitor with 4.73-inch height and 2.36-inch diameter dimensions and safety certifications.
Specification chart for 50+10 uF 370/440 VAC CBB65B dual run capacitor with technical details.
Diagram showing 3-terminal layout for 50+10 uF dual run start capacitor with Common, Herm, and Fan labels.
BlueStars 50+10 uF 370/440 VAC dual run capacitor with aluminum case and metalized polypropylene film construction.
Educational infographic showing how to choose a 50+10 uF CBB65B dual run start capacitor for HVAC systems.
BlueStars 50+10 uF 370/440 VAC dual run capacitor being installed by a technician in an HVAC condenser unit.
Technician installing a 50+10 uF 370/440 VAC dual run capacitor in an HVAC condenser unit.
Infographic showing wide application of 50+10 uF dual run capacitor for AC, refrigerator, heat pump, and compressor.
50+10 uF 370/440 VAC CBB65B dual run round capacitor for condenser and heat pump units.
Step-by-step installation guide for 50+10 uF dual run capacitor in AC condenser and heat pump units.
Infographic showing when to replace a 50+10 uF dual run start capacitor for AC condenser and heat pump units.
50+10 uF CBB65B dual run capacitor for AC condenser and heat pump units.
50+10 uF CBB65B dual run capacitor with 4.73-inch height and 2.36-inch diameter dimensions and safety certifications.
Specification chart for 50+10 uF 370/440 VAC CBB65B dual run capacitor with technical details.
Diagram showing 3-terminal layout for 50+10 uF dual run start capacitor with Common, Herm, and Fan labels.
BlueStars 50+10 uF 370/440 VAC dual run capacitor with aluminum case and metalized polypropylene film construction.
Educational infographic showing how to choose a 50+10 uF CBB65B dual run start capacitor for HVAC systems.
BlueStars 50+10 uF 370/440 VAC dual run capacitor being installed by a technician in an HVAC condenser unit.
Technician installing a 50+10 uF 370/440 VAC dual run capacitor in an HVAC condenser unit.
Infographic showing wide application of 50+10 uF dual run capacitor for AC, refrigerator, heat pump, and compressor.
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50+10 uF MFD ±5% 370/440 VAC CBB65B Dual Run Start Round Capacitor - Fits Condenser, Heat Pump

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50+10 uF MFD ±5% 370/440 VAC CBB65B Dual Run Start Round Capacitor

Key Features

  • Capacitance: 50 + 10 Microfarad (uF/MFD)
  • Voltage Rating: 370 / 440 Volts AC (VAC)
  • Capacitance Tolerance: ±5%
  • Operating Frequency: 50 / 60 Hz
  • Shape: Round
  • Terminals: 3 (Common, Fan, Hermetic Compressor)
  • Construction: Metal housing, oil-filled
  • Operating Temperature Range: -25°C to +70°C

Replaces / Cross-Reference Part Numbers

  • Directly replaces any round dual-run capacitor with identical 50+10 uF capacitance and 370V or 440V ratings.
  • Compatible with capacitors in the CBB65 series.
  • Cross-reference: 97F9895, Z97F995, 97F9895BZ3, 27L880, TRCD455, TRCFD455, PRCFD455, 27L889, 97F9851, 97F9851S, 12788, RC0114, Z97F9895, 97F9895, TT-CAP-45/5/440R, HC98KA046, TP-CAP-45/5/440R, CAP050450440RT, HC98JA046, HCKS450D050R440Z, 00662441180262.

Compatibility & Fitment

  • Designed for starting and running single-phase AC motors.
  • Commonly used in air conditioning units, heat pumps, condenser units, and furnace blower motors.
  • Serves both the compressor motor (50 uF) and the fan motor (10 uF) in a single component.

When to Replace

  • Motor hums but does not start.
  • Fan runs slower than normal or needs a manual push to start.
  • Compressor fails to engage.
  • Visible signs of damage such as bulging, cracking, or leaking fluid from the capacitor case.
  • Capacitance measures outside the specified tolerance range when tested.

Installation Tips

  • Disconnect all power to the equipment before beginning work.
  • Safely discharge the existing capacitor by shorting across the terminals with an insulated tool.
  • Verify that the voltage and microfarad (uF) ratings match the original capacitor.
  • Note the wire placement on the old capacitor's terminals (C, FAN, HERM) before disconnecting.
  • Ensure all wire connections are secure before restoring power.
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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 50+10 uF capacitor is designed for use in air conditioning condenser units, heat pumps, and various AC motor and fan starting applications. It is compatible with systems requiring a dual run capacitor with these specific capacitance ratings.
Common signs of a failing capacitor include the AC unit failing to start, the fan motor humming but not spinning, or the compressor struggling to engage. If you notice the top of the capacitor is domed or bulging, or if you detect a burning smell near the electrical panel of the condenser, it is likely time for a replacement.
Yes. This capacitor is rated for both 370V and 440V. A 440V capacitor is a direct replacement for a 370V unit of the same capacitance, as it is designed to handle the higher voltage threshold without issue.
Installation typically takes 15 to 30 minutes. You will need a screwdriver to remove the access panel, a pair of insulated needle-nose pliers to disconnect the terminals, and a multimeter to verify the power is off. Always discharge the old capacitor with an insulated screwdriver before touching the terminals to avoid electrical shock.
Before installation, ensure the power to the condenser unit is completely shut off at the disconnect box or circuit breaker. Inspect the wiring terminals for signs of corrosion or heat damage; if the connectors are loose or charred, they should be cleaned or replaced to ensure a solid connection to the new capacitor.
Capacitors are subjected to extreme temperature fluctuations and continuous electrical stress. Over time, the internal dielectric material degrades, often accelerated by high ambient heat, frequent power surges, or age, eventually leading to a loss of capacitance and the inability to start the motor.