EMERSON C55FGB-3521 Electric Motor Ac 1/3HP

( Brand: Emerson ), ( Manufacturer Part Number: C55FGB-3521 ), ( Part Type: Ac Motor ), ( Rated Load: Hp ), ( Nema Design Letter: Design B ), ( Ac Frequency Rating: 60 Hz ), ( Shaft Type: Keyed ), ( Ac Motor Type: Induction/asynchronous ), ( Mounting Type: Base-mounted ), ( Current Type: Ac ), ( Unit Type: Unit ), ( Nominal Rated Input Voltage: 115 V, 230 V ), ( Ac Phase: Single Phase ), ( Country Of Origin: United States )

Review EMERSON Electric Motor Division Ac 1/3hp Model Used

The **Emerson C55FGB-3521 Electric Motor** is a high-performance, single-phase, alternating current (AC) fractional horsepower motor designed for reliability, efficiency, and versatility in a wide range of industrial, commercial, and residential applications. Engineered with Emerson s commitment to precision engineering, this **1/3 horsepower (0.373 kW) motor** delivers consistent power output while maintaining exceptional durability under demanding operational conditions. Built with a **55-frame size**, this motor features a compact yet robust construction, making it ideal for integration into space-constrained systems such as HVAC units, pumps, compressors, conveyors, and other mechanical assemblies where compact yet powerful performance is essential. The motor s **squirrel-cage induction design** ensures smooth, vibration-free operation, minimizing wear and tear on connected equipment while maximizing energy efficiency.

At the heart of the Emerson C55FGB-3521 is a **permanent split-capacitor (PSC) starting mechanism**, which eliminates the need for complex relay systems or external starters, simplifying installation and reducing maintenance requirements. This self-starting capability, combined with a **3521-rated voltage of 115V AC**, ensures seamless operation across a broad spectrum of applications without sacrificing performance. The motor s **Class B insulation system** (rated for temperatures up to 130 C) enhances thermal resilience, extending the lifespan of both the motor and the surrounding machinery by preventing overheating in high-load scenarios. Additionally, the **NEMA Premium efficiency rating** confirms that this motor operates at optimal energy levels, reducing operational costs while adhering to stringent environmental and regulatory standards.

Constructed from high-grade materials, the C55FGB-3521 features a **cast aluminum end shields** and a **die-cast iron rotor**, providing superior strength and resistance to corrosion, dust, and moisture qualities that make it well-suited for both indoor and outdoor environments. The motor s **ball-bearing support system** ensures low-friction operation, reducing energy loss and prolonging bearing life, while its **NEMA Premium efficiency designation** further underscores its commitment to minimizing power consumption without compromising performance. Whether deployed in a commercial refrigeration system, an industrial ventilation setup, or a residential appliance, this motor operates with quiet efficiency, delivering the consistent torque and speed required for peak productivity.

Emerson s rigorous quality control processes guarantee that every C55FGB-3521 motor undergoes stringent testing for performance, reliability, and safety, ensuring it meets or exceeds industry benchmarks. The motor s **universal compatibility** with standard 115V AC power supplies and its **NEMA C-face mounting configuration** allow for seamless integration into existing systems, reducing downtime and installation complexity. With its blend of **durability, energy efficiency, and low-maintenance design**, the Emerson C55FGB-3521 is an excellent choice for engineers, contractors, and facility managers seeking a dependable, long-lasting motor that balances performance with operational simplicity. Whether in a new installation or as a replacement for aging equipment, this motor delivers the power and precision needed to keep systems running smoothly for years to come.

### **Pros and Cons of buying a Emerson C55FG-B3521 (1/3 HP Electric Motor for AC)**

1. **Reliable Brand Reputation** Emerson is a well-known manufacturer in the HVAC and motor industry, offering products with a proven track record of durability and performance.

2. **Energy Efficiency** As an electric motor designed for air conditioning systems, it is likely optimized for efficiency, helping reduce energy consumption compared to older or less efficient models.

3. **Compatibility** This motor is specifically designed for use in air conditioning compressors, ensuring proper fit and function with compatible AC units.

4. **Easy Installation** Many Emerson motors come with standard mounting and wiring configurations, making replacement or installation less complex for experienced technicians.

5. **Warranty Coverage** Emerson typically offers warranties (often 1 2 years), providing some protection against defects in materials or workmanship.

6. **Quiet Operation** Electric motors like this one are generally quieter than older, less refined models, reducing noise in residential or commercial settings.

7. **Low Maintenance** Electric motors require less maintenance than some other types of motors, especially if they are properly lubricated and protected from environmental factors.

8. **Cost-Effective for Replacement** If your existing motor is failing, replacing it with a new Emerson unit can be more economical than buying a new AC system entirely.

1. **Limited Lifespan** Like all motors, this one will eventually wear out, especially if used in harsh conditions (e.g., extreme temperatures, high humidity, or poor maintenance).

2. **Potential Compatibility Issues** While designed for AC use, there may be slight variations in voltage, phase, or mounting requirements depending on the specific AC unit it is being installed in.

3. **Dependence on Professional Installation** Improper installation can lead to reduced efficiency, premature failure, or even damage to the AC system. DIY installation is not recommended unless the user has experience.

4. **Cost of Replacement Parts** If the motor fails prematurely, replacement parts (such as bearings or windings) may add to the overall cost.

5. **Environmental Sensitivity** Exposure to moisture, dust, or extreme temperatures can shorten the motor s lifespan if not properly protected.

6. **Energy Costs** While efficient, electric motors still consume power, and running an AC system with a faulty or inefficient motor can increase energy bills.

7. **Limited Customization** This is a standard motor; if you need specific performance characteristics (e.g., variable speed), you may need a different model or additional components.

8. **Resale Value** Unlike a whole AC unit, a motor has little to no resale value once removed from the system.

---

### **Conclusion**

The Emerson C55FG-B3521 (1/3 HP electric motor for AC) is a solid choice for replacing a failing motor in an air conditioning system. Its reliability, efficiency, and compatibility with standard AC units make it a practical option for homeowners or businesses needing a straightforward replacement. However, its lifespan is finite, and proper installation and maintenance are critical to maximizing performance.

If your AC system is otherwise in good condition and the motor is the primary issue, this motor provides a cost-effective solution. For older systems with multiple failing components, however, a full AC replacement may be more economical in the long run.

---

### **Recommendation**

- Your AC system is relatively new or in good condition, and the motor is the only failing component.

- You prioritize a reputable brand with good warranty support.

- You plan to have a professional install it to ensure proper function and longevity.

- Your AC system is outdated, and a full replacement would be more cost-effective.

- You need a motor with additional features (e.g., variable speed or higher efficiency ratings).

- You are uncomfortable with professional installation costs.

For most standard residential or light commercial AC applications, this motor is a dependable and efficient choice. Always verify compatibility with your specific AC unit before purchasing.

Details:

Emerson Electric Motor Division AC 1/3hp model C55FGB-3521 Used 1725rpm Tested and works. Will accept return or issue if you run into any issues. Please reach out with questions. Overall great condition as shown in pictures.

part #: c55fgb3521 price

• $48.00

specifications oelemot:

• brand: Emerson
• mpn: C55fgb-3521
• part type: Ac Motor
• rated load: Hp
• nema design letter: Design B
• ac frequency rating: 60 Hz
• shaft type: Keyed
• ac motor type: Induction/asynchronous
• mounting type: Base-mounted
• current type: Ac
• unit type: Unit
• nominal rated input voltage: 115 V, 230 V
• ac phase: Single Phase
• country of origin: United States

returns oelemot:

• policy: No Returns

general oelemot:

• condition: Used
• Industrial Automation Motion Controls > Electric Motors > General Purpose Motors

shipping oelemot:

• transit: 4-10 Days
• service: USPS Ground Advantage
• cost: $28.00
• type: Fixed
• carrier: USPS
• class: Standard

seller oelemot:

• city: Waconia, Minnesota
• # reviews: 234
• rating: 99.6%

payments oelemot:

• other
• money order
• credit card: Diners-club
• wallet: Google-pay

offer oelemot:

• best offers: True
• started: February 22, 2026
• sold: 0
• quantity: 1
• options: Ship-to-home
• availability: In Stock

Emerson C55FGB-3521 Is Similar To:

• 1400kw Emerson Induction Motor Generator 4160 (37% similar) C, 480 volt, 3 phase, TEFL electric motor low noise fan tip blades induced draft with vertical exhaust complete man-door access. 4 amps, 3 phase, 60 hz. Rise for normal output, heaters: 2 RDS per phase, cooler: 40 deg. Viewing: you can also call me to schedule a tour viewing of the enclosure if are ...(March 10th, 2017)
• 1622-25419 Emerson Antique Electric Motor Hp Rpm Lathe Pulley Works (43.1% similar) S60ZFA temp. I will only ship to the address provides me. I will not accept best offers to these types of addresses. If you don't see it in the photos, is not included. I will not end an offer early to sell item directly at any price, please place a bid. Free shipping is to the 48 lower us...(October 21st, 2018)
• 2111 Emerson Fan Motor 3.3 (36% similar) Permanently lubricated bearings individually boxed impedance PROTECTED6W under are hertz rated suitable for all angle OPERATION24 cord with molded strain relief cast iron housing includes vibration dampener hub washer, speed nut, 4 mounting screws 2 to 35 watt. Fan motor Emerson 3 shaded pole unit...(October 18th, 2017)
• 2114 Emerson Shaded Pole Unit Bearing Fan Motor Watts 786382067397 (37.2% similar) Combined shipping is available on most items when purchased together. Condition: new other see details whats in the box: one MOTOR,4 mounting screws,manual. If you would like another size or please place that order from the inventory available online. The box is damaged...(July 1st, 2018)
• 21900420072 Emerson Dc Motor Arm Fields Frame (38.9% similar) Came out of slightly used working machine. Comes with everything in photos. Shipping is extra. Emerson dc motor with Cleveland control dynamic braking resistor...(October 24th, 2018)
• 33egy-2021 Emerson Electric Motor Rpm (48% similar) Working Emerson electric motor 110V 1550 rpm. 5 w small fan motor...(October 26th, 2018)
• 3883-3 Emerson Motor Bonnet Adapter Series Part (40% similar) Includes only what is pictured. Pictures may be stock photos. All measurements are approximate. Emerson motor bonnet adapter K46000178 series part item may have some signs of wear consistent with previous use scratches, scuffs, smudges, etc. Please refer to pics...(June 1st, 2018)
• 6128 Emerson Psc Condenser Motor Free Shipping (34.9% similar) Purchased stock from a retired hvac technician. Great motor if you can use it...(March 31st, 2018)
• 6212-jc3 U.s Motors Emerson Motor 40hp (31.7% similar) Lower end brag 7312-BEP upper 6212-JC3 40HP 3545 rpm 3-PHASE totally enclosed 230 460V 324TP vertical shaft motor 740 pounds class 1 group...(February 10th, 2017)
• 960101-01 Emerson Electronic Servo Motor Lbs Torque (47.4% similar) Comes as shown in photos. Speed: 3000 243 wide approx.: 01S n: 9248918PMRMAX. Shaft diameter. Emerson electronic motion controls servo motor model: DXM-455WMANUFACTURE part no. Peak torque: 110 in. Shaft length : long note: used, has scratches, some scuff marks, dings, and a bit dusty dirty key way...(June 1st, 2018)
• A035 Emerson Electric Motor 5 (50% similar) ...(July 12th, 2017)