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708-850 uF MFD 110-125 VAC 50/60 Hz Round Start Capacitor - Universal Fits Air Conditioner, Electric Motors

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708-850 uF/MFD 110-125 VAC Round Start Capacitor

Key Features

  • Capacitance: 708-850 microfarads (uF/MFD)
  • Voltage Rating: 110-125 Volts AC (VAC)
  • Frequency: 50/60 Hz
  • Operating Temperature: -40°C to +65°C (-40°F to +149°F)
  • Terminals: 1/4 inch male quick-disconnect
  • Case Material: Plastic, moisture and oil resistant
  • Shape: Round
  • Dimensions: 1-13/16 inch Diameter x 4-3/8 inch Height
  • Safety Standard: UL 810 Recognized

Replaces / Cross-Reference Part Numbers

  • Direct replacement for any start capacitor with the same capacitance and voltage ratings.
  • Replaces parts in the 708-850 uF/MFD range rated for 110 VAC, 115 VAC, or 125 VAC.

Compatibility & Fitment

  • Designed for intermittent duty in single-phase AC motor starting circuits.
  • Provides temporary starting torque for electric motors found in appliances and equipment such as air conditioners, heat pumps, refrigeration units, well pumps, and pool pumps.
  • Fitment is determined by matching the original capacitor's uF/MFD rating, VAC rating, and physical dimensions. The voltage rating of the replacement capacitor must be equal to or greater than the original.

When to Replace

  • Motor hums but fails to start.
  • Motor starts slowly or requires manual assistance to start.
  • Circuit breaker trips when the motor attempts to start.
  • Visible damage to the existing capacitor, such as bulging, cracking, or leaking fluid.

Installation Tips

  • Disconnect all electrical power to the equipment before beginning service.
  • Safely discharge the existing capacitor by shorting the terminals with a resistor or an insulated screwdriver.
  • Verify the capacitance (uF/MFD) and voltage (VAC) of the new capacitor match the specifications of the part being replaced.
  • Note the wire placement on the old capacitor terminals before disconnecting.
  • Ensure a secure mechanical and electrical connection.
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  • Perfect fit

    Perfect fit

    Universal fit with any brands with the same ratings
  • Premium quality

    Premium quality

    This product adopts a high-quality metalized polypropylene film that provides stable and durable performance
  • Saving solution

    Saving solution

    Enjoy the great feeling when your engine is repaired and works properly like before - BlueStars brings DIY solutions to help you deal with any trouble
  • Simple installation

    Simple installation

    Because the capacitor is a relatively simple part, the installation just takes a few minutes and will save you at least a hundred bucks in labor

FAQ

If your motor or compressor hums but fails to reach full speed, or if it trips the circuit breaker immediately upon startup, the start capacitor is likely the culprit. You may also notice the motor struggling to turn or failing to start entirely despite receiving power.
Yes. As long as the microfarad (uF/MFD) rating of 708-850 and the voltage rating of 110-125 VAC match your existing unit, this capacitor is a compatible replacement regardless of the original manufacturer's brand name. It cross-references with common industry part numbers such as TMJ708, PMJ708, and 092A708B125BD4A.
Absolutely. Start capacitors store a significant electrical charge even after the power has been disconnected. Before touching the terminals, always discharge the capacitor by placing an insulated-handle screwdriver across the terminals to bridge the connection. Failure to do so can result in a dangerous electrical shock.
For most HVAC units and electric motors, installation takes approximately 15 to 30 minutes. You will generally need a screwdriver to access the capacitor housing and a pair of needle-nose pliers to disconnect and reconnect the spade terminals. Ensure the power is completely shut off at the breaker before beginning.
Start capacitors are designed for short-term duty to provide the initial torque required to get a motor spinning. Over time, internal heat buildup, frequent cycling, or power surges can cause the dielectric material inside to break down, leading to a loss of capacitance. If your equipment is cycling on and off rapidly, it will significantly shorten the lifespan of the capacitor.
While the capacitor can be mounted in any orientation, it is best practice to mount it vertically with the terminals facing upward if space permits. This prevents potential leakage or internal damage over time. Ensure the new unit is securely fastened in the mounting bracket to prevent vibration damage during motor operation.