AO SMITH H661 Ac Motor K56J 1.5HP 3450RPM 3PH 200-230/460V-AC

( Brand: Ao Smith ), ( Manufacturer Part Number: H661 ), ( Part Type: Ac 5hp Motor ), ( Frame: K56j ), ( Power: 1.5 Hp ), ( Rpm: 3450 Rpm ), ( Shaft Od: 0.625 In ), ( Phase: 3ph ), ( Voltage: 460 V-ac ), ( Reference Sku: 1760771 ), ( Product Condition: Used Excellent )

Review AO SMITH Ac Motor 1.5hp 3450rpm 3ph 200-230/460v-ac

The **A.O. Smith H661 AC Motor (Model K56J, 1.5 HP, 3450 RPM, 3-Phase, 200-230/460V AC)** is a robust, high-performance electric motor engineered for demanding industrial applications where reliability, efficiency, and durability are paramount. This premium motor is part of A.O. Smith s trusted line of electric drives, renowned for their precision engineering and long-term operational excellence. With a **1.5 horsepower (HP) output**, it delivers consistent power across a wide range of mechanical systems, including pumps, compressors, conveyors, and industrial machinery, ensuring optimal performance in both light to moderate and sustained heavy-duty operations.

Designed for **three-phase alternating current (3-Phase AC) operation**, this motor operates seamlessly within a voltage range of **200-230V or 460V**, making it highly versatile for integration into diverse electrical systems without the need for additional voltage conversion. Its **synchronous speed of 3450 RPM** ensures swift and efficient torque delivery, ideal for applications requiring high rotational speed while maintaining smooth operation. The motor s compact yet sturdy **K56J frame size** balances space efficiency with structural integrity, allowing for easy installation in tight industrial environments without compromising performance.

Built to withstand the rigors of continuous use, the H661 motor features **high-quality materials and advanced manufacturing techniques**, including precision-balanced rotor and stator assemblies that minimize vibration and noise, extending both the motor s lifespan and the longevity of connected equipment. Its **closed, self-ventilated design** ensures protection against dust, moisture, and contaminants, making it suitable for both indoor and outdoor industrial settings where environmental factors could otherwise degrade performance. Additionally, the motor s **NEMA Premium efficiency rating** reflects its energy-saving capabilities, reducing operational costs while adhering to stringent environmental standards.

A.O. Smith s reputation for innovation is evident in the H661 s **low-maintenance construction**, which includes sealed bearings and corrosion-resistant coatings to resist wear and tear over extended periods. The motor s **thermal protection features** automatically shut down in case of overheating, preventing damage and ensuring safe, uninterrupted operation. Whether deployed in water treatment facilities, HVAC systems, manufacturing plants, or agricultural machinery, this motor provides the **reliability and power** needed to keep critical processes running smoothly with minimal downtime.

For industries prioritizing **cost-effectiveness and performance**, the H661 AC Motor stands out as a dependable workhorse. Its **universal voltage compatibility**, combined with its high-efficiency design, makes it an excellent choice for businesses looking to optimize energy consumption while maintaining peak operational efficiency. With A.O. Smith s commitment to quality and durability, this motor is not just a component it s a long-term investment in operational excellence.

### **Pros and Cons of buying a AO Smith H661 AC Motor (K56J, 1.5HP, 3450 RPM, 3-Phase, 200-230/460V)**

1. **High Efficiency and Reliability** AO Smith is a well-known brand in HVAC and water heater components, known for durable and energy-efficient motors. This motor is designed for continuous operation, making it suitable for industrial or commercial applications like water pumps, compressors, or fans.

2. **Wide Voltage Range (200-230V / 460V)** The dual-voltage capability (200-230V for single-phase and 460V for three-phase) makes it versatile for different electrical setups, reducing the need for additional voltage converters in some cases.

3. **High RPM (3450 RPM)** The 3450 RPM speed is ideal for applications requiring high airflow or fluid movement, such as air handlers, centrifugal pumps, or industrial blowers.

4. **1.5HP Power Rating** Suitable for medium-duty applications where moderate power is required without excessive strain on the electrical system.

5. **Three-Phase Capability** Three-phase motors are generally more efficient and provide smoother operation compared to single-phase motors, making them better for heavy-duty or continuous-use systems.

6. **Potential for Long Lifespan** AO Smith motors are built with robust construction, often featuring sealed bearings and corrosion-resistant materials, which can extend the motor s operational life if properly maintained.

7. **Compatibility with AO Smith Systems** If you re working with AO Smith water heaters, boilers, or HVAC systems, this motor is likely designed to integrate seamlessly, reducing compatibility issues.

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1. **Three-Phase Requirement** This motor is designed for three-phase power (460V), which may not be available in all locations, especially in residential or small commercial setups. Single-phase systems would require additional equipment (like a VFD or phase converter), increasing costs.

2. **Higher Initial Cost** Three-phase motors are generally more expensive than single-phase alternatives, especially for smaller power ratings like 1.5HP. The price may not justify the purchase if a single-phase motor would suffice.

3. **Specialized Installation** Three-phase motors require careful wiring and balancing of phases, which may necessitate professional electrical work. Improper installation can lead to motor failure or electrical hazards.

4. **Limited Availability of Spare Parts** While AO Smith is a reputable brand, finding replacement parts for older or less common models can be challenging compared to more universally used motors (e.g., TEFC or explosion-proof motors from brands like Siemens or WEG).

5. **Overkill for Light-Duty Applications** If the motor is being used in a low-demand system (e.g., a small residential pump), the 1.5HP and 3450 RPM may be excessive, leading to unnecessary energy consumption and wear.

6. **Noise and Vibration** High-RPM motors can generate more noise and vibration, which may be problematic in sensitive environments like offices or homes.

7. **Maintenance Requirements** Like all motors, this one will require periodic maintenance (bearing lubrication, cooling checks, etc.). Poor maintenance can reduce lifespan and efficiency.

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The **AO Smith H661 AC motor (K56J, 1.5HP, 3450 RPM, 3-phase)** is a **strong choice for industrial, commercial, or high-demand applications** where three-phase power is available. Its efficiency, dual-voltage capability, and high RPM make it well-suited for systems like water pumps, compressors, or large HVAC units. However, if the application is **light-duty, single-phase, or in a location without three-phase power**, the cost and complexity may not be justified.

For **residential or small commercial use**, a **single-phase motor** (e.g., 1.5HP, 1725 RPM) from a widely available brand like **TEFC or WEG** might be a more practical and cost-effective alternative. If three-phase power is available and the motor fits the application s needs, this AO Smith motor is a **reliable, efficient, and durable option**.

- You have **three-phase power (460V)** available.

- The motor is needed for **industrial, commercial, or high-flow applications** (e.g., water pumps, compressors, large air handlers).

- You value **AO Smith s reputation for durability** and are willing to invest in a premium motor.

- The **1.5HP and 3450 RPM** match the system s requirements.

- You only have **single-phase power** (unless you re willing to add a phase converter).

- The application is **low-demand** (e.g., small residential pump), where a cheaper single-phase motor would suffice.

- You cannot justify the **higher upfront cost** compared to more universally available motors.

- You lack **experience with three-phase motors**, as improper installation can be risky.

For most **residential or small commercial users**, a **single-phase TEFC or WEG motor** would likely be a better balance of cost and functionality. However, for **industrial or high-performance systems**, this AO Smith motor is a solid, high-quality choice.

Details:

Circuit Breakers. Motor Starters. Model Number:H661. Motor Drives.

Shock Absorbs. Solenoid Valves. Solenoid Coils.

part #: h661 prices

• $155.95-$157.49

specifications oelemot:

• brand: Ao Smith
• mpn: H661
• part type: Ac 5hp Motor
• frame: K56j
• power: 1.5 Hp
• rpm: 3450 Rpm
• shaft od: 0.625 In
• phase: 3ph
• voltage: 460 V-ac
• reference sku: 1760771
• product condition: Used Excellent

payments oelemot:

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

returns oelemot:

• method: Money back
• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

offer oelemot:

• availability: In Stock
• sold: 0
• started: April 14, 2026
• best offers: True
• options: Ship-to-home
• quantity: 1

shipping oelemot:

• type: Fixed
• class: Standard, Expedited, One-day
• transit: 5-5 Days
• service: Standard, Expedited, Overnight
• cost: $0.00

general oelemot:

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

seller oelemot:

• city: Delta, Ohio
• rating: 100.0%
• # reviews: 127048

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