WESTINGHOUSE 11787971 Ac Motor Rpm 1/3 1725

( Brand: Westinghouse ), ( Manufacturer Part Number: 11787971 ), ( Part Type: Ac Hp Motor ), ( Rated Load: Hp ), ( Iec Frame Size: 56 ), ( Ac Frequency Rating: 60 Hz ), ( Enclosure Type: Open ), ( Shaft Type: Tapered ), ( Ac Motor Type: Split Phase ), ( Shaft Diameter: 1/2 In ), ( Mounting Type: Resilient Mount ), ( Current Type: Ac ), ( Service Factor: 1.00 ), ( Nominal Rated Input Voltage: 115 V, 120 V ), ( Ac Phase: Single Phase ), ( Nema Frame Suffix: Z ), ( Country Of Origin: United States )

Review WESTINGHOUSE Ac Motor Hp 1/3 Rpm

The **Westinghouse 11787971 1/3 Horsepower Single-Phase AC Motor** is a robust and reliable electric motor designed to deliver consistent performance in a wide range of industrial, commercial, and residential applications. Engineered with precision, this motor operates at a nominal speed of **1725 RPM**, making it ideal for applications requiring moderate torque and efficiency without excessive vibration or noise. Built with a **1/3 horsepower (HP) output**, it strikes a perfect balance between power and energy consumption, ensuring optimal performance for tasks such as fans, blowers, pumps, compressors, and small machinery where steady, dependable operation is essential.

Constructed with **high-quality materials**, the Westinghouse 11787971 features a durable **cast iron endbell and frame**, providing exceptional strength and resistance to wear over extended use. Its **split-phase induction design** ensures smooth starting performance, eliminating the need for additional starting capacitors in most applications, while its **efficient winding configuration** maximizes energy conversion, reducing operational costs. The motor is equipped with a **standard NEMA Premium efficiency rating**, adhering to stringent industry standards for energy efficiency, which translates to lower electricity consumption and longer component lifespan.

This motor is designed for **long-term reliability**, featuring a **ball-bearing or sleeve-bearing configuration** (depending on the model variant) that minimizes friction and heat buildup, reducing maintenance requirements. The **sealed shaft design** helps prevent dust, moisture, and debris from entering critical components, enhancing durability in both clean and harsh environments. Additionally, the **universal voltage compatibility** (typically 115V or 230V, depending on the application) ensures flexibility in installation across various electrical systems without the need for additional transformers or modifications.

Whether integrated into an HVAC system, an industrial conveyor, a water pump, or a small workshop appliance, the Westinghouse 11787971 delivers **quiet, vibration-free operation** while maintaining a compact yet sturdy footprint. Its **low-noise operation** is a result of balanced rotor design and precision manufacturing, making it suitable for applications where minimal sound disruption is preferred. The motor s **thermal protection features**, such as built-in overload relays or thermal cutouts, provide an added layer of safety by automatically shutting down in case of overheating, preventing potential damage to connected equipment.

For professionals and DIY enthusiasts alike, the Westinghouse 11787971 represents a **cost-effective, high-performance solution** that combines durability, efficiency, and ease of installation. Its **universal mounting options** (including NEMA C-face or flange mounts) ensure compatibility with a wide range of equipment, while its **long service life** makes it a sound investment for both new installations and replacements. With Westinghouse s reputation for quality and innovation, this motor stands as a dependable choice for applications demanding performance without compromise.

### **Pros and Cons of buying a Westinghouse 11787971 AC Motor (1/3 HP, 1725 RPM)**

1. **Reliable Brand Reputation** Westinghouse is a well-known manufacturer with a history of producing durable electric motors for residential and light commercial applications. Their motors are often used in HVAC systems, fans, and pumps, where reliability is critical.

- Ceiling fans

- Window AC units

- Small air handlers

- Light-duty pumps or blowers

This motor is likely a direct replacement for many older or failed units, reducing compatibility issues.

3. **Affordable Replacement Option** Compared to OEM (Original Equipment Manufacturer) motors, this aftermarket option is often cheaper, making it a cost-effective solution for repairs rather than replacing an entire appliance.

4. **Easy Installation** Most 1/3 HP AC motors of this type have standard mounting configurations (e.g., flange or direct mount) and wiring setups, allowing for straightforward installation with basic tools.

5. **Energy Efficiency** While not the most efficient motor on the market, it operates within reasonable efficiency standards for its class, providing adequate performance for low-to-medium-duty tasks without excessive energy consumption.

6. **Wide Availability** As a common motor size, it is readily available at hardware stores, online retailers (Amazon, Home Depot, etc.), and specialty electrical supply shops, reducing lead times.

7. **Compatibility with Common Appliances** Many older or generic appliances (e.g., some Honeywell, Carrier, or generic window AC units) use motors of this size, making it a versatile replacement part.

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1. **Potential Quality Variations** Since this is an aftermarket motor, quality control may not be as strict as OEM parts. Some units may have manufacturing inconsistencies, such as:

- Slightly loose bearings (leading to vibration or noise over time).

- Subpar insulation or wiring, which could pose a fire risk if not installed correctly.

- Shorter lifespan compared to name-brand OEM motors.

2. **Lack of Warranty or Support** Many aftermarket motors come with limited or no warranties (e.g., 90 days vs. 1 5 years for OEM parts). If the motor fails prematurely, returns or replacements may be difficult to obtain.

3. **Performance Limitations** A 1/3 HP motor is not designed for heavy-duty or continuous high-load applications. If the appliance it powers requires more torque or sustained power (e.g., a high-capacity air handler or industrial blower), this motor may struggle, leading to overheating or failure.

4. **Compatibility Risks** While the specifications match many applications, slight variations in shaft length, mounting holes, or electrical connections (e.g., wire gauge) could cause fitment issues. Always verify compatibility with the appliance s manual or a professional before purchasing.

5. **Environmental and Operating Conditions** If the motor will operate in harsh environments (e.g., extreme dust, moisture, or temperature fluctuations), its lifespan may be shortened. Westinghouse motors are typically rated for general indoor use unless specified otherwise.

6. **No Advanced Features** Unlike premium motors (e.g., those with brushless designs or variable speed control), this motor lacks advanced efficiency or longevity features. It is a basic, single-speed AC induction motor.

7. **Potential for Counterfeit Products** Purchasing from untrusted sellers (especially online marketplaces) may result in counterfeit or low-quality knockoffs that fail quickly. Always buy from reputable retailers to avoid this risk.

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The **Westinghouse 11787971 AC Motor (1/3 HP, 1725 RPM)** is a **practical and cost-effective replacement** for small appliances like ceiling fans, window AC units, or light-duty air handlers. It offers **reliability, affordability, and ease of installation**, making it a solid choice for basic applications where performance demands are modest.

However, it is **not ideal for high-load or industrial applications**, and buyers should be cautious of **quality inconsistencies, lack of warranty support, and potential compatibility issues**. If the motor is used in a critical system (e.g., HVAC in a home), consider **verifying compatibility thoroughly** or opting for an **OEM or higher-quality aftermarket motor** (e.g., from brands like Emerson, McMaster-Carr, or reputable suppliers like Grainger).

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- You need a **quick, budget-friendly replacement** for a small appliance.

- The motor s specifications (HP, RPM, voltage) **exactly match** your appliance s requirements.

- You purchase it from a **trusted retailer** (e.g., Home Depot, Amazon, or a well-reviewed electrical supplier) to avoid counterfeit products.

- The application is **low-to-medium duty** (e.g., a ceiling fan or window AC unit).

- The appliance requires **high torque, continuous heavy use, or specialized mounting**.

- You need **long-term reliability** (e.g., for a commercial HVAC system), in which case an **OEM or premium aftermarket motor** may be worth the higher cost.

- You suspect **poor installation practices** (e.g., improper wiring or overloading), as this could void any minimal warranties and reduce lifespan.

- You cannot **confirm compatibility** with the appliance s manual or a professional.

**Final Verdict:** For **basic, low-cost replacements in non-critical applications**, this motor is a **decent choice**. For **higher-stakes or performance-sensitive uses**, prioritize **quality and compatibility** over cost. Always test the motor briefly after installation to ensure smooth operation before full use.

Details:

Full load amps nameplate is 6, checked running on bench about 5.4 which fine. Has some cosmetic wear but runs great. A nice split phase motor. They are designed that way to run close full load amps.

Westinghouse AC Motor 11787971, HP 1/3, 1725 RPM. Installed a new 5 foot cord. Runs as it should.

part #: 11787971 prices

• $99.00-$299.88

specifications oelemot:

• brand: Westinghouse
• mpn: 11787971
• part type: Ac Hp Motor
• rated load: Hp
• iec frame size: 56
• ac frequency rating: 60 Hz
• enclosure type: Open
• shaft type: Tapered
• ac motor type: Split Phase
• shaft diameter: 1/2 In
• mounting type: Resilient Mount
• current type: Ac
• service factor: 1.00
• nominal rated input voltage: 115 V, 120 V
• ac phase: Single Phase
• nema frame suffix: Z
• country of origin: United States

shipping oelemot:

• transit: 6-13 Days
• class: Standard
• type: Calculated
• service: UPS Ground
• cost: $63.90
• carrier: UPS

offer oelemot:

• availability: In Stock
• started: June 11, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1

general oelemot:

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

payments oelemot:

• other
• credit card: Discover
• wallet: Apple-pay

seller oelemot:

• rating: 100.0%
• city: Conway, South Carolina
• # reviews: 1854

returns oelemot:

• policy: No Returns

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