Product Overview

Run capacitors are essential for many types of electric motors, particularly the Permanent Split Capacitor (PSC) motors commonly found in HVAC systems for compressors and fan motors. Unlike start capacitors, which provide a temporary boost to get a motor turning, run capacitors remain in the circuit continuously while the motor is operating. Their primary function is to create a phase shift in the electrical current supplied to the motor's start winding, allowing it to run efficiently and smoothly.

The **Supco 30+3 Mfd 370V/440V Round Dual Run Capacitor** is a specific type designed to serve *two* motors within a single unit – typically the compressor and the outdoor fan motor in an air conditioner or heat pump. The "dual" nature is indicated by the two MFD (microfarad) ratings: 30 Mfd for the compressor and 3 Mfd for the fan. This single component replaces two separate capacitors, simplifying wiring and saving space.

The "370V/440V" rating signifies its voltage handling capability. This capacitor is rated to operate safely and effectively in systems requiring either 370 volts AC or 440 volts AC. This dual voltage rating offers excellent versatility and is crucial for compatibility with a wide range of HVAC equipment. The "Round" shape is a common form factor, ensuring it fits into many standard capacitor mounting brackets.

Manufactured by Supco (Sealed Unit Parts Co., Inc.), a respected name in the HVAC and appliance service industry, this capacitor is built for durability and reliable performance, meeting or exceeding OEM specifications. It's a direct replacement for common part numbers like CD30+3X370R, 12826, and PRCFD303, making it an easy swap for many units.

Finding the right replacement part quickly is vital, especially during peak cooling or heating seasons. Enter Enterpristore.xyz. They stock genuine parts like this Supco dual run capacitor, ensuring you get a reliable component without unnecessary delays. Visit the product page directly: Supco 30+3 Mfd 370V/440V Dual Run Capacitor at Enterpristore.xyz.

Why Capacitors Fail and Symptoms of Trouble

Capacitors are passive electronic components, but they operate under stressful conditions within an HVAC system. They are constantly subjected to heat, voltage fluctuations, and continuous electrical load. Over time, these factors can degrade the internal dielectric material, reducing the capacitor's capacitance (its ability to store a charge) or causing internal shorts or opens.

Common Causes of Capacitor Failure:

• Heat: High ambient temperatures in the outdoor unit are the primary enemy of capacitors, accelerating degradation.
• Age: Like any electronic component, capacitors have a lifespan, typically ranging from 5 to 10 years, though this varies greatly depending on quality, usage, and operating conditions.
• Voltage Spikes/Fluctuations: Irregular power supply can stress the capacitor.
• System Issues: An overworked motor due to low refrigerant, dirty coils, or mechanical issues can cause the capacitor to work harder and fail prematurely.
• Manufacturing Defects: Though less common with reputable brands like Supco, defects can occur.

Symptoms of a Failing Run Capacitor:

Recognizing the signs of a bad capacitor can help you diagnose the problem before it causes more significant damage to your HVAC system. Common symptoms include:

• Compressor or Fan Motor Won't Start: This is the most common symptom. The motor might make a humming or buzzing sound but won't spin.
• Slow Start-Up: Motors take longer than usual to get up to speed.
• System Short Cycling: The unit turns on briefly, then shuts off.
• Reduced Cooling/Heating Performance: If the fan isn't running at full speed or the compressor isn't starting reliably, the system won't condition air effectively.
• Unusual Noises: Humming, buzzing, or clicking sounds from the outdoor unit.
• Motor Overheating: A motor trying to start or run without proper capacitance can overheat, potentially leading to permanent damage.

If you notice any of these symptoms, it's wise to have the system inspected by a qualified HVAC technician. They can safely test the capacitor and confirm if it needs replacement with a quality part like the Supco 30+3 Mfd from Enterpristore.xyz.

Key Features of the Supco 30+3 Mfd 370V/440V Dual Run Capacitor

Choosing a replacement capacitor requires understanding its specific characteristics and ensuring they match your system's needs. The Supco 30+3 Mfd 370V/440V capacitor offers several key features that make it a reliable and popular choice:

• Dual Capacitance (30 Mfd + 3 Mfd): Provides two distinct capacitance values within a single housing. The 30 Mfd terminal is typically for the compressor motor ('Herm' terminal), and the 3 Mfd terminal is for the fan motor ('Fan' terminal). The 'C' terminal is common for both. This setup is standard for many residential and light commercial HVAC units.
• Dual Voltage Rating (370V / 440V): This capacitor is engineered to handle voltages up to 440 volts AC. Critically, it can be used as a replacement for systems requiring either a 370V *or* a 440V run capacitor of the same MFD rating. You *must* use a capacitor with a voltage rating equal to or *higher* than your original capacitor's rating. This dual rating adds flexibility.
• Round Shape: The standard round form factor is designed to fit securely into most HVAC unit electrical compartments and mounting clamps.
• Dual Terminals: Features clearly labeled terminals ('C', 'Herm', 'Fan') for easy and correct wiring connection of both the compressor and fan motor leads. Multiple spade terminals on each connector allow for multiple wires to be attached.
• Durable Construction: Built to withstand the demanding operating conditions of HVAC units, including high temperatures and vibration. Supco is known for manufacturing parts that meet stringent quality standards.
• Direct Replacement: Matches common specifications, making it a suitable replacement for a wide range of original equipment manufacturer (OEM) and aftermarket capacitors with 30/3 Mfd and 370V/440V ratings. It specifically replaces models like CD30+3X370R, 12826, and PRCFD303.

Benefits of Using the Supco 30+3 Mfd 370V/440V Capacitor

Opting for a quality replacement like the Supco 30+3 Mfd offers tangible benefits for your HVAC system and your peace of mind:

• Restored System Performance: A properly functioning run capacitor ensures that both your compressor and fan motor start correctly and run at their intended efficiency, restoring optimal cooling or heating capacity.
• Extended Motor Lifespan: By providing the necessary phase shift and torque, the capacitor reduces stress on the motors during start-up and operation, potentially extending their working life. Running a motor with a failing capacitor can lead to premature motor burnout – a much more expensive repair.
• Energy Efficiency: Motors running efficiently consume less power. A correctly sized and functioning run capacitor helps your HVAC system operate closer to its designed energy efficiency levels, potentially lowering electricity bills.
• Cost-Effective Repair: Replacing a capacitor is significantly less expensive than replacing a compressor or fan motor damaged by trying to run with a faulty capacitor. It's a crucial preventative or corrective maintenance step.
• Reliability: Supco is a trusted brand in the HVAC industry, known for producing reliable parts. Using a Supco capacitor means installing a component built to last under typical operating conditions.
• Wide Compatibility: The 30/3 Mfd and 370V/440V dual rating makes this capacitor compatible with a vast number of residential and light commercial air conditioning and heat pump systems from various manufacturers. (Always verify your unit's specific requirements).
• Convenient Single Unit: As a dual run capacitor, it handles two motors from a single component, simplifying wiring compared to using two separate capacitors.

Getting a high-quality part is paramount. You can find this reliable Supco capacitor readily available for purchase at Enterpristore.xyz. Ensure you're buying from a reputable source for genuine parts.

Product Specifications

Understanding the technical specifications is crucial for ensuring compatibility with your HVAC unit. For the Supco 30+3 Mfd 370V/440V Round Dual Run Capacitor, the key specifications are:

• Capacitance: 30 microfarads (µF or MFD) and 3 microfarads (µF or MFD)
• Voltage Rating: 370 Volts AC / 440 Volts AC (Can replace 370V or 440V units with the same MFDs)
• Type: Run Capacitor
• Configuration: Dual (One capacitor servicing two motors)
• Shape: Round
• Terminals: 3 Terminals: Common (C), Hermetic/Compressor (Herm), Fan (Fan). Each terminal typically has multiple spade connectors (e.g., 1/4 inch).
• Tolerance: Typically +/- 5% (Industry standard, ensuring the capacitance is within a small margin of the listed value)
• Operating Temperature Range: Commonly rated for -40°C to +70°C (-40°F to +158°F), suitable for outdoor HVAC environments. (Specific rating may vary slightly by batch, refer to product labeling if critical).
• Manufacturer: Supco (Sealed Unit Parts Co., Inc.)
• Replacement For: CD30+3X370R, 12826, PRCFD303, and other capacitors with the same 30/3 MFD and 370/440V ratings.
• Physical Dimensions: Standard sizes for round dual capacitors of this rating. Height and diameter can vary slightly by manufacturer but are generally standardized to fit common brackets. (Exact dimensions may be listed on the product page or packaging).

Always verify that these specifications match the requirements listed on your original capacitor or your HVAC unit's service manual before purchasing. The product page at Enterpristore.xyz provides specific details about this model.

Installation Guide (For Qualified Individuals Only)

**CRITICAL SAFETY WARNING:** Replacing an HVAC capacitor involves working with high voltage electricity which can be fatal. Capacitors store electrical energy even after power is disconnected. This procedure should ONLY be performed by a qualified, trained HVAC technician or electrician. Attempting this repair without proper knowledge, tools, and safety precautions can result in serious injury or death, and may damage your equipment or void warranties. This guide provides general steps for informational purposes for professionals. Do NOT attempt this yourself if you are not qualified.

Assuming you are a qualified professional with the necessary training and tools, here are the general steps involved in replacing a dual run capacitor like the Supco 30+3 Mfd 370V/440V:

1. Ensure Power is OFF: The absolute first step is to completely disconnect power to the outdoor unit. Locate the service disconnect box near the unit and flip the switch OFF. For added safety, turn off the corresponding breaker in your home's electrical panel. Use a non-contact voltage tester or a multimeter to confirm that NO power is present at the unit's wiring terminals.
2. Access the Capacitor: Open the electrical panel cover on the outdoor unit. The capacitor is typically a cylindrical component located within this compartment, often held by a clamp.
3. Discharge the Old Capacitor: **This is critical!** Even with power off, the capacitor can hold a lethal charge. Using a properly insulated tool (like a screwdriver with an insulated handle) with a resistor wired between the metal shaft and tip (specifically designed for discharging capacitors, or a pair of pliers with insulated handles touching both terminals simultaneously - *use caution and appropriate safety gear*), carefully short circuit the terminals. Start with the 'C' (common) terminal and one other ('Herm' or 'Fan'), then the 'C' terminal and the remaining one. You might see a small spark or hear a pop; this is the stored energy discharging. Even if you don't, assume it was charged and performed the discharge steps carefully.
4. Photograph Wiring: Before disconnecting anything, take clear photos of the wiring connections to the old capacitor. Note which colored wire goes to which terminal (C, Herm, Fan). This is crucial for correct reconnection. Some capacitors and units use different colored wires, so matching the *terminal labels* is key.
5. Disconnect Wires: Using insulated needle-nose pliers or a terminal puller, carefully and firmly pull the wires straight off the spade terminals of the old capacitor. Avoid pulling on the wires themselves.
6. Remove Old Capacitor: Loosen the clamp holding the capacitor and remove the old unit. Double-check the MFD and Voltage ratings on the old capacitor to confirm they match the new Supco 30+3 Mfd 370V/440V unit you are installing.
7. Install New Supco Capacitor: Place the new Supco capacitor from Enterpristore.xyz into the clamp and secure it. Ensure the terminals are facing correctly for easy wire connection.
8. Connect Wires to New Capacitor: Referring to your photos, reconnect the wires to the corresponding terminals on the new Supco capacitor (C to C, Herm to Herm, Fan to Fan). Ensure connections are snug and secure on the spade terminals.
9. Close Up Unit: Carefully route the wires away from moving parts and sharp edges. Reattach the electrical panel cover securely.
10. Restore Power and Test: Turn the breaker back on inside your home, then flip the service disconnect switch ON at the outdoor unit. Set your thermostat to call for cooling or heating and observe the outdoor unit. The fan should start spinning smoothly, followed by the compressor shortly after. Listen for normal operating sounds.

Again, this is a simplified guide. A qualified technician has the knowledge to diagnose the issue accurately, select the correct replacement part (like the high-quality Supco available at Enterpristore.xyz), and perform the replacement safely and correctly.

Supco: A Name You Can Trust

Supco, or Sealed Unit Parts Co., Inc., has been a reliable supplier of HVAC and appliance service parts for decades. Technicians and professionals in the field trust Supco for their quality, durability, and wide range of products designed to meet or exceed industry standards. When you choose a Supco capacitor, you're choosing a part that HVAC professionals rely on to perform consistently in demanding environments. This commitment to quality makes the Supco 30+3 Mfd 370V/440V dual run capacitor a smart investment in the longevity and efficiency of your HVAC system.

Where to Buy: Get Your Supco Capacitor at Enterpristore.xyz

Finding the right part is only half the battle; getting it from a reliable source is equally important. Enterpristore.xyz is a trusted online retailer specializing in HVAC and appliance parts, offering a convenient and dependable way to purchase the components you need.

When you buy the Supco 30+3 Mfd 370V/440V Round Dual Run Capacitor from Enterpristore.xyz, you benefit from:

• Genuine Parts: They supply authentic parts from reputable manufacturers like Supco, ensuring quality and compatibility.
• Convenience: Easily browse and purchase the exact part you need online, anytime.
• Reliable Stock: Keeping essential parts like common run capacitors in stock means less downtime for your HVAC system.
• Direct Link: Find the product page quickly using this direct link: Supco 30+3 Mfd 370V/440V Dual Run Capacitor at Enterpristore.xyz.
• Shipping: Get the part delivered to your location, saving time and effort.

For HVAC professionals or informed consumers working with a technician, Enterpristore.xyz provides a reliable source for this crucial replacement part. Don't settle for generic or low-quality alternatives when the performance of your HVAC system is on the line.

Common Questions About Run Capacitors and the Supco 30+3 Mfd

Here are answers to some frequently asked questions regarding run capacitors, specifically relevant to the Supco 30+3 Mfd 370V/440V dual model:

Q1: What does "30+3 Mfd" mean?

A: "30+3 Mfd" (microfarads) indicates that this is a dual run capacitor with two distinct capacitance ratings within a single unit. The '30' refers to the capacitance for one circuit (typically the compressor motor), and the '3' refers to the capacitance for a second circuit (typically the outdoor fan motor). Each value has its own terminal connection (30 Mfd goes to 'Herm', 3 Mfd goes to 'Fan'), sharing a common terminal ('C').

Q2: Can I use a 370V capacitor instead of a 440V (or vice versa) if the MFDs match?

A: This specific Supco capacitor is rated for *both* 370V and 440V. This means it can be used as a replacement for *either* a 370V original capacitor *or* a 440V original capacitor, *provided the MFD ratings (30+3) are the same*. However, generally, you must replace a capacitor with one that has the *same MFD rating* and a *voltage rating equal to or higher* than the original. You should never use a capacitor with a lower voltage rating than the system requires.

Q3: My old capacitor is 35+5 Mfd. Can I use this 30+3 Mfd Supco?

A: **No.** The MFD (microfarad) rating must match the original capacitor's MFD rating exactly (or be within a very tight tolerance, usually +/- 5%). Using a capacitor with an incorrect MFD rating will cause the motor to operate inefficiently, overheat, draw excessive current, and likely lead to premature failure of the motor or capacitor. Always match the MFDs.

Q4: What are the 'C', 'Herm', and 'Fan' terminals for?

A: These are the labels for the terminals on a standard dual run capacitor:

• C (Common): This terminal is the common connection point for both the compressor and the fan motor circuits.
• Herm (Hermetic): This terminal is for the compressor motor circuit (often labeled 'Hermetic' as compressors used to be hermetically sealed). This is where the wire from the compressor's start/run winding connects. The capacitance between C and Herm is the larger value (30 Mfd on this Supco).
• Fan (Fan): This terminal is specifically for the outdoor fan motor circuit. This is where the wire from the fan motor connects. The capacitance between C and Fan is the smaller value (3 Mfd on this Supco).

Q5: How long do run capacitors typically last?

A: The lifespan varies widely based on quality, operating temperature, usage, and voltage stability. A typical lifespan is between 5 and 10 years. However, they can fail much sooner, especially in hot climates or if subjected to frequent power surges. It's often recommended to proactively replace capacitors in older units during preventative maintenance.

Q6: Is it really dangerous to replace a capacitor myself?

A: **Yes, absolutely.** Capacitors store electrical charges that can be lethal even when the main power to the unit is off. Discharging them safely requires specific knowledge and tools. High voltage is present in HVAC systems. Attempting this repair without proper training, safety equipment, and confirmation that the capacitor is discharged is extremely hazardous. Always hire a qualified professional.

Q7: How can a technician test if my capacitor is bad?

A: A qualified technician will use a multimeter with a capacitance testing function. After safely disconnecting power and discharging the capacitor, they will disconnect the wires and measure the capacitance between the terminals (C to Herm for compressor MFD, C to Fan for fan MFD, and potentially Herm to Fan, though the first two are key). The measured values should be within the +/- 5% tolerance of the capacitor's listed ratings (e.g., 30 Mfd and 3 Mfd). If the readings are significantly lower, higher, or show open circuits, the capacitor is faulty. They might also check for physical signs of failure like swelling or leaking.

Q8: Why should I buy this Supco capacitor from Enterpristore.xyz?

A: Enterpristore.xyz is a reliable online retailer specializing in HVAC and appliance repair parts. They offer genuine, high-quality components like this Supco capacitor. Buying from a trusted source ensures you receive the correct part that meets specifications, rather than a potentially unreliable counterfeit or low-quality substitute. Their online store makes it convenient to find and order the exact Supco 30+3 Mfd 370V/440V capacitor you need, delivered efficiently.

Conclusion: Restore Reliability with Supco and Enterpristore.xyz

A failing run capacitor is a common culprit behind many HVAC system issues, from a complete lack of operation to reduced efficiency and increased wear on expensive motors. The **Supco 30+3 Mfd 370V/440V Round Dual Run Capacitor** is a high-quality, durable replacement part designed to reliably power both your compressor and fan motors, ensuring your air conditioning or heat pump system operates smoothly and efficiently.

Its dual MFD ratings, versatile dual voltage capability, and robust construction make it a trusted component by HVAC professionals. By replacing a faulty capacitor with this genuine Supco part, you can restore your system's performance, potentially extend the life of your motors, and improve overall energy efficiency.

Remember, due to the high voltage involved, capacitor replacement should always be performed by a qualified technician who understands the safety protocols and proper wiring procedures. They rely on access to quality parts.

For homeowners or technicians seeking this specific, reliable Supco 30+3 Mfd 370V/440V capacitor, look no further than Enterpristore.xyz. As a reputable supplier of HVAC and appliance parts, they offer genuine components and the convenience of online shopping. Visit the product page today to get your system running correctly again:

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