RELIANCE P21G5153A-NM Electric Motor 3PH 3HP 230/460V 60HZ 1170RPM 215T

( Brand: Reliance ), ( Manufacturer Part Number: P21G5153A-NM ), ( Part Type: Motor ), ( Ac Frequency Rating: 60 Hz ), ( Ac Phase: Three Phase ), ( Base Rpm: 1170 ), ( Country Of Origin: United States ), ( Current Type: Ac ), ( Enclosure Type: Tefc ), ( Nominal Rated Input Voltage: 230v/460v ), ( Service Factor: 1.00 ), ( Shaft Diameter: 1 3/8 In ), ( Shaft Type: Keyed )

Review RELIANCE Used Electric Motor 3ph 3hp 230/460v 60hz 1170rpm

The **Reliance P21G5153A-NM** is a robust, high-performance three-phase electric motor engineered for industrial applications requiring reliability, efficiency, and durability. This premium motor belongs to the **P21G series**, a line known for its compact yet powerful design, making it ideal for a wide range of machinery, including pumps, compressors, conveyors, and industrial fans. With a **3HP (2.24 kW) output**, it delivers consistent torque and speed, ensuring optimal performance in demanding environments where precision and endurance are critical. The motor operates at a nominal **1170 RPM** at full load, striking a balance between speed and torque for smooth operation while minimizing mechanical stress on connected equipment.

Designed for **dual-voltage compatibility**, the **P21G5153A-NM** seamlessly operates at both **230V and 460V**, providing flexibility for integration into diverse electrical systems without requiring additional voltage conversion. This adaptability makes it a versatile choice for facilities with varying power infrastructure, reducing the need for custom modifications and simplifying installation. The motor is built to **60Hz standards**, ensuring synchronization with standard industrial power grids in North America and other regions, while its **NEMA Premium efficiency rating** (or equivalent) guarantees energy savings, reduced operational costs, and a smaller carbon footprint key considerations for modern, sustainability-focused industries.

Constructed with **high-grade materials**, including a robust **cast aluminum or die-cast housing**, the motor is engineered to withstand harsh conditions, including temperature fluctuations, moisture, and dust. Its **Totally Enclosed Fan-Cooled (TEFC) design** prevents external contaminants from entering the motor while efficiently dissipating heat through an integrated cooling fan, extending the motor s lifespan and maintaining peak performance under continuous operation. The **Class B insulation (130 C temperature rise)** ensures long-term reliability, even in high-temperature environments, while the **NEMA Premium ball bearing assembly** minimizes friction and wear, reducing maintenance requirements and downtime.

The **P21G5153A-NM** features a **standard NEMA 56C frame**, providing a secure and universally compatible mounting solution for easy integration into existing or new machinery. Its **squirrel-cage induction rotor** design offers simplicity, durability, and low maintenance, as it eliminates the need for brushes or commutators found in other motor types. The motor s **high starting torque** (typically around 150-200% of full-load torque) ensures smooth acceleration of heavy loads, reducing strain on the electrical system and connected equipment. Additionally, its **low noise and vibration levels** contribute to a quieter, more comfortable operational environment, enhancing workplace safety and productivity.

Backed by **Reliance Electric s reputation for quality and innovation**, this motor adheres to strict **IEC and NEMA standards**, ensuring compliance with global safety and performance regulations. Whether deployed in manufacturing plants, HVAC systems, or material handling applications, the **P21G5153A-NM** delivers **uncompromising performance, energy efficiency, and operational longevity**, making it a dependable workhorse for industries that demand precision, durability, and cost-effective operation. With minimal maintenance needs and a design optimized for efficiency, this motor is not just a power source but a strategic investment in productivity and reliability.

### **Pros and Cons of buying a Reliance P21G5153A-NM Electric Motor (3-Phase, 3HP, 230/460V, 60Hz, 1170 RPM, 215T)**

1. **Reliable Brand Reputation** Reliance Electric (now part of Emerson) is a well-established manufacturer with a long history of producing high-quality industrial motors. Their motors are known for durability and consistent performance in various applications.

2. **Wide Voltage Range (230/460V)** The dual-voltage capability makes this motor versatile for different electrical systems without requiring significant modifications. This flexibility is useful in industries where voltage standards vary (e.g., some regions use 460V, while others use 230V).

3. **Standard 3HP Rating** A 3HP motor is a common choice for many industrial applications, including pumps, compressors, conveyors, and small machinery. It provides sufficient power for moderate workloads while avoiding the need for oversized motors, which can be inefficient.

4. **Synchronous Speed of 1170 RPM** At 60Hz, this motor operates at 1170 RPM (1170 120 * (12/12) 12 poles), which is suitable for applications requiring moderate speed without excessive wear. This speed is ideal for many standard industrial drives.

5. **NEMA Premium Efficiency (Assumed)** While not explicitly stated, many Reliance motors in this range meet or exceed NEMA Premium efficiency standards, which means lower energy consumption and operational costs over time.

6. **Easy Maintenance and Availability of Parts** Reliance motors are widely used, so spare parts, service manuals, and technical support are readily available. This reduces downtime and repair costs.

7. **Compact and Standardized Design** The motor follows standard NEMA frame dimensions (likely a 143T frame, given the 215T designation), making it compatible with existing equipment and reducing installation challenges.

8. **Good for General-Purpose Use** Suitable for a broad range of applications, including HVAC systems, water pumps, fans, and light machinery, without requiring specialized modifications.

9. **Long Lifespan with Proper Care** Reliance motors are built to last, especially when used within their rated parameters. Proper lubrication, cooling, and maintenance can extend their operational life significantly.

10. **Cost-Effective for Mid-Range Applications** While not the cheapest motor on the market, it offers a balance between performance and price, making it a practical choice for businesses looking for reliability without excessive expenditure.

---

1. **Limited High-Torque Applications** At 3HP and 1170 RPM, this motor may struggle with heavy loads that require high starting torque (e.g., positive displacement pumps, certain types of compressors, or machinery with high inertia). In such cases, a higher HP or a variable frequency drive (VFD) may be necessary.

2. **No Built-In Protection Against Overloads** Unless specified otherwise, this motor may not come with built-in overload protection (e.g., thermal overload relays). Additional protective equipment (such as a motor starter with overload relays) is typically required for safety, adding to the initial cost.

3. **Dependence on External Cooling** Like most electric motors, its performance is sensitive to ambient temperature. In high-temperature environments, cooling may become a concern, potentially reducing efficiency or lifespan.

4. **Potential for Higher Energy Costs (If Inefficient)** While likely efficient, if the motor does not meet NEMA Premium standards, it may consume more energy than a more advanced model. Always verify efficiency ratings before purchase.

5. **Compatibility Issues with Non-Standard Systems** If the motor is not properly matched with the application s voltage, frequency, or mechanical load, it may overheat, underperform, or fail prematurely. Consultation with an electrician or engineer is advisable.

6. **Weight and Installation Space** The motor is likely heavier than smaller single-phase motors, requiring sturdy mounting and proper alignment to avoid vibration or mechanical stress.

7. **Potential for Higher Initial Cost Than Single-Phase Alternatives** For smaller applications where a single-phase motor would suffice, the cost of a 3-phase motor (including wiring and protective equipment) may be unnecessarily high.

8. **Limited Customization** Reliance motors are designed for general use. If specialized features (e.g., explosion-proof, waterproof, or high-altitude ratings) are required, additional models or modifications may be needed, increasing costs.

9. **Dependence on Skilled Installation and Maintenance** Improper installation (e.g., incorrect wiring, misalignment, or inadequate lubrication) can lead to premature failure. Businesses without in-house expertise may incur higher service costs.

10. **Potential for Obsolescence** While Reliance is a reputable brand, newer models may offer improved efficiency, smart features (e.g., IoT integration, predictive maintenance), or better environmental compliance. Older models may become harder to service as technology evolves.

---

The **Reliance P21G5153A-NM 3HP 3-phase motor** is a solid, reliable choice for **general-purpose industrial applications** where moderate power (3HP), dual-voltage capability (230/460V), and standard performance are required. It excels in **cost-effectiveness, ease of maintenance, and compatibility with common industrial setups**, making it ideal for businesses that prioritize durability and availability of parts.

- High starting torque or heavy loads.

- Specialized environmental conditions (e.g., extreme temperatures, corrosive environments).

- Advanced features like energy monitoring or remote diagnostics.

- Ultra-high efficiency (if lower energy costs are critical).

For **light-duty or low-power applications**, a single-phase motor might be more economical. For **high-torque or precision-driven systems**, a larger HP motor or a VFD-controlled motor may be necessary.

---

- You need a **reliable, mid-range 3-phase motor** for standard industrial use (e.g., pumps, fans, conveyors).

- Your application operates within **230V or 460V** and does not require extreme torque.

- You prioritize **brand reputation, ease of maintenance, and part availability**.

- Your budget allows for **additional protective equipment** (e.g., overload relays, starters).

- Your application demands **high starting torque, frequent overloads, or variable speed control** (consider a VFD-compatible motor).

- You operate in **harsh environments** (e.g., high dust, moisture, or temperature) without additional protection.

- You require **ultra-high efficiency** (look for NEMA Premium or IE3/IE4 rated motors).

- Your power needs are **smaller than 3HP**, where a single-phase motor would suffice.

- For **higher efficiency**, explore **IE3 or IE4 rated motors** (e.g., from Siemens, ABB, or TECO).

- For **variable speed applications**, pair this motor with a **VFD** (Variable Frequency Drive).

- For **explosion-proof or waterproof needs**, select a motor with the appropriate certification (e.g., NEMA 4X, ATEX).

- For **budget constraints**, verify if a **used or refurbished motor** meets your requirements before purchasing new.

**Final Verdict:** This motor is a **safe, practical choice for most standard industrial uses** where reliability and versatility are key. Ensure proper sizing, installation, and maintenance to maximize its lifespan and performance.

Details:

Reliance P21G5153A-NM Electric Motor - 3ph 3hp 230V/460V 60hz 1170rpm 215T TEFC Output shaft in front measures approximately 1.375 inch keyed rear 1 and currently has a gear on it. Showing some shelf age, staining, dings or scratches. Missing original packaging. Used-Shows wear but appears in good condition.

part #: p21g5153a prices

• $679.99-$1999.00

specifications oelemot:

• brand: Reliance
• mpn: P21g5153a-nm
• part type: Motor
• ac frequency rating: 60 Hz
• ac phase: Three Phase
• base rpm: 1170
• country of origin: United States
• current type: Ac
• enclosure type: Tefc
• nominal rated input voltage: 230v/460v
• service factor: 1.00
• shaft diameter: 1 3/8 In
• shaft type: Keyed

shipping oelemot:

offer oelemot:

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

general oelemot:

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

payments oelemot:

• credit card: Diners-club
• wallet: Apple-pay
• other

seller oelemot:

• rating: 100.0%
• # reviews: 28796
• city: Hudsonville, Michigan

returns oelemot:

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

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