MARATHON ELECTRIC K500 Tefc Motor 1HP 3450RPM 56C 3PH 9323

( Brand: Marathon Electric ), ( Manufacturer Part Number: K500 ), ( Part Type: Motor )

Review MARATHON ELECTRIC 1hp 3450rpm 56c Tefc 3ph Motor

The **Marathon Electric K500 Series 1 Horsepower (1HP) 3-Phase Induction Motor**, model **9323**, is a robust, high-performance electric motor engineered for reliability, efficiency, and durability in demanding industrial, commercial, and light-duty applications. This **TEFC (Totally Enclosed Fan-Cooled)** motor features a **56-frame size**, delivering a compact yet powerful solution for driving pumps, compressors, conveyors, fans, and other mechanical loads with precision. Operating at a nominal speed of **3450 RPM**, the motor is designed to deliver **1 horsepower (746 watts)** of continuous output, making it ideal for medium-duty tasks where consistent performance and energy efficiency are critical. Its **3-phase AC induction design** ensures smooth operation across a wide range of voltage inputs, typically compatible with standard industrial power supplies (e.g., 208V, 230V, 460V, or 575V, depending on configuration), while its **Class B insulation** (180 C rise) provides extended operational life under normal conditions. The motor s **NEMA Premium efficiency rating** ensures minimal energy loss, reducing operational costs while maintaining peak performance. Built with **Marathon Electric s proprietary high-quality materials**, including corrosion-resistant coatings and reinforced bearings, this motor is engineered to withstand harsh environments, including exposure to dust, moisture, and temperature fluctuations, making it suitable for both indoor and outdoor applications. The **K500 series** is renowned for its **low maintenance requirements**, thanks to its sealed construction, which eliminates the need for external lubrication and reduces the risk of contamination. Additionally, the motor s **high torque-to-speed ratio** ensures reliable startup performance even under heavy loads, while its **quiet operation** minimizes noise pollution in sensitive environments. Whether integrated into a manufacturing facility, HVAC system, or agricultural equipment, the Marathon Electric K500 1HP 3450 RPM 56C TEFC 3-phase motor delivers a perfect balance of power, efficiency, and longevity, making it a dependable choice for engineers and operators seeking a premium, long-lasting electric motor solution.

### **Pros and Cons of buying a Marathon Electric K500 (1HP, 3450 RPM, 56C, TEFC, 3-Phase Motor, NEMA 9323)**

1. **Reliability and Brand Reputation** Marathon Electric is a well-established manufacturer known for producing durable, high-quality industrial motors. Their motors are widely used in commercial and industrial applications, offering consistent performance over long periods.

2. **High Efficiency** The 56C energy efficiency rating indicates that this motor is more energy-efficient than older standards (like NEMA Premium), helping reduce operational costs over time.

3. **Three-Phase Design** Three-phase motors are generally more powerful, smoother, and more stable than single-phase motors, making them ideal for heavy-duty applications such as pumps, compressors, and conveyors.

4. **Total Enclosed Fan-Cooled (TEFC) Construction** This design protects the motor from dust, moisture, and contaminants while allowing internal cooling through an external fan. It is suitable for indoor and outdoor use in moderate environmental conditions.

5. **Standard NEMA 9323 Frame** The NEMA 9323 frame is a common industrial standard, meaning replacement parts, accessories, and mounting hardware are widely available.

6. **1HP Power Rating** Suitable for medium-duty applications where a small but robust motor is needed, such as in HVAC systems, small manufacturing equipment, or agricultural machinery.

7. **3450 RPM Speed** This speed is common for fractional horsepower motors and works well with standard belt drives, gearboxes, and direct-coupled applications.

8. **Low Maintenance** TEFC motors require minimal maintenance compared to open or splash-proof designs, reducing downtime.

9. **Compatibility with Variable Frequency Drives (VFDs)** Many Marathon motors are designed to work with VFDs, allowing for speed control and energy savings in applications where variable torque is needed.

10. **Warranty and Support** Marathon Electric typically offers warranties (often 1 5 years depending on the model), and their customer service is generally reliable for troubleshooting and replacements.

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1. **Higher Upfront Cost Compared to Single-Phase Motors** Three-phase motors are generally more expensive than single-phase alternatives, which may be overkill for light-duty applications.

2. **Requires Three-Phase Power Supply** Unlike single-phase motors, this motor cannot operate on standard household electricity (120V or 240V single-phase). A dedicated three-phase power source (208V, 230V, 460V, etc.) is necessary, which may require additional infrastructure costs.

3. **Slightly Larger and Heavier** Due to its three-phase design and TEFC enclosure, this motor is bulkier than single-phase options, which may limit installation flexibility in space-constrained environments.

4. **Potential Overkill for Light-Duty Use** If the application only requires minimal power (e.g., small fans, light machinery), a 1HP three-phase motor may be more expensive than necessary. A single-phase motor could suffice in such cases.

5. **VFD Compatibility May Add Cost** While many Marathon motors work with VFDs, purchasing a compatible drive system adds to the overall expense.

6. **Limited Availability of Single-Phase Alternatives** If the application could technically use a single-phase motor, finding a direct replacement may be easier, but performance and efficiency may suffer.

7. **Environmental Limitations** While TEFC motors are robust, they are not rated for harsh conditions like extreme dust, corrosive chemicals, or high humidity without additional protection (e.g., explosion-proof or washdown-rated enclosures).

8. **Higher Initial Current Draw** Three-phase motors typically draw more current during startup, which may require careful consideration of electrical panel capacity.

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The **Marathon Electric K500 (1HP, 3450 RPM, 56C, TEFC, 3-Phase, NEMA 9323)** is a solid choice for applications requiring **reliable, efficient, and durable three-phase motor performance**. It excels in **medium-duty industrial, commercial, or manufacturing settings** where three-phase power is available and where efficiency and longevity are priorities.

However, if the application is **light-duty, space-limited, or lacks three-phase power**, a single-phase motor may be a more cost-effective alternative. Additionally, if the motor is being purchased for a **specific VFD-controlled system**, ensure compatibility to avoid unnecessary expenses.

- You have a **three-phase power supply** (208V, 230V, 460V, etc.).

- Your application requires **medium-duty performance** (e.g., pumps, compressors, conveyors, HVAC systems).

- You prioritize **energy efficiency (56C rating) and long-term reliability**.

- You need a **standard NEMA frame** for easy maintenance and part replacement.

- Your application is **light-duty** (e.g., small fans, appliances) and a single-phase motor would suffice.

- You lack **three-phase power** and cannot justify the infrastructure cost.

- The motor is being purchased for a **niche or low-torque application** where a smaller HP rating (e.g., HP) would work.

For most **industrial or commercial applications where three-phase power is available**, this motor is a **strong, cost-effective choice** with minimal long-term maintenance concerns. Always verify **voltage compatibility, load requirements, and environmental conditions** before finalizing the purchase.

Details:

Manufacturer Part Number: K500. Used - Part comes with two attachments. Most items are in stock when they listed. Also an unknown Metal Plate.

The product must be the original item shipped, with matching serial numbers if applicable. PN: 93331404. 2-Year MRO Shield Protection Plan Included. Special Instructions.

Marathon Electric K500 1HP 3450RPM 56C TEFC 3PH Motor Manufactured by MARATHON ELECTRIC. An unknown cord.

part #: k500 price

• $221.32

specifications momaequ:

• brand: Marathon Electric
• mpn: K500
• part type: Motor

payments momaequ:

• wallet: Paypal
• credit card: Diners-club
• other

offer momaequ:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• best offers: True
• started: June 3, 2026
• quantity: 1

returns momaequ:

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

seller momaequ:

• city: Mount Sterling, Kentucky
• # reviews: 26239
• rating: 99.8%

general momaequ:

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

shipping momaequ:

• type: Calculated
• transit: 3-7 Days
• class: Standard, Expedited, One-day
• service: UPS Ground, USPS Ground Advantage, USPS Priority Mail, UPS Next Day Air
• cost: $96.30
• carrier: UPS, USPS

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