RELIANCE 21410-5 Phase Rpm Ac Motor 5HP 230V/460 1740 21/10.5

( Brand: Reliance ), ( Manufacturer Part Number: 21410-5 ), ( Part Type: Ac 5hp 230v Motor ), ( Actual Rated Input Voltage: 230 V ), ( Full Load Amps: 5.1 ), ( Ac Frequency Rating: 60 Hz ), ( Base Rpm: 3450 ), ( Ac Motor Type: Induction/asynchronous ), ( Mounting Type: Foot-mounted ), ( Definite Purpose Motor Type: Close-coupled Pump Motor ), ( Current Type: Ac ), ( Service Factor: 1.15 ), ( Ac Phase: Three Phase )

Review RELIANCE 5hp 230v/460 Phase Rpm Duty Ac Motor Amps 21/10.5

The **Reliance 21410-5 5 Horsepower (HP) AC Motor**, a robust and versatile workhorse designed for industrial, commercial, and heavy-duty applications, delivers reliable performance with precision engineering. Operating at a nominal power rating of **5 HP**, this motor is engineered to handle demanding tasks with efficiency and durability, making it an ideal choice for conveyor systems, pumps, compressors, fans, and other high-torque machinery. Built for **230V or 460V single-phase or three-phase** operation, this motor offers flexibility in power distribution, ensuring seamless integration into diverse electrical setups without compromising performance. With a **synchronous speed of 1740 RPM** at full load, it balances speed and torque, providing consistent rotational power for applications requiring steady, high-performance operation.

Constructed with **high-grade materials**, this motor features a rugged **TEFC (Totally Enclosed Fan-Cooled)** design, ensuring protection against dust, moisture, and debris while maintaining optimal thermal regulation. The **1740 RPM** speed rating is achieved through a carefully calibrated winding configuration, allowing for smooth and efficient energy conversion with minimal vibration. The motor s **NEMA Premium efficiency classification** ensures superior energy savings, reducing operational costs while meeting stringent industry standards for performance and reliability. Whether used in manufacturing plants, agricultural equipment, or HVAC systems, this motor s robust construction and high-efficiency operation make it a dependable asset for long-term productivity.

The **21/10.5** designation refers to its **frame size (21) and the corresponding shaft diameter (10.5)**, ensuring compatibility with a wide range of mechanical couplings, pulleys, and drive systems. Its **IP55 protection rating** further enhances its resilience in harsh environments, shielding internal components from solid particles and light splashes. The motor s **low-maintenance design** and **long service life** are backed by Reliance s reputation for quality, offering users peace of mind with minimal downtime. Whether powering a conveyor belt in a warehouse, driving a centrifugal pump in a water treatment facility, or operating a compressor in an industrial setting, this **5 HP, 1740 RPM AC motor** delivers consistent, high-performance power with unmatched reliability.

### **Pros and Cons of buying a Reliance 21410-5 5HP 230V/460V 3-Phase AC Motor (1740 RPM, 21/10.5)**

1. **Reliable Brand Reputation** Reliance Electric (now part of Emerson) is a well-established manufacturer known for durable industrial motors, ensuring long-term performance and availability of spare parts.

2. **Dual Voltage (230V/460V)** The motor can operate in both single-phase (230V) and three-phase (460V) setups, making it versatile for different industrial applications.

3. **Standard NEMA Frame (21)** The NEMA 21 frame is widely used, meaning it is easy to find compatible couplings, belts, and mounting hardware.

4. **Efficient Performance** A 5HP motor at 1740 RPM is suitable for moderate to heavy-duty applications like pumps, compressors, conveyors, and fans, offering a good balance between power and efficiency.

5. **Low Maintenance** As a standard AC induction motor, it requires minimal upkeep compared to more complex motor types (e.g., variable frequency drives or synchronous motors).

6. **Cost-Effective for General Use** Priced reasonably for its specifications, making it a practical choice for small to medium-sized industrial or commercial applications.

7. **Compatibility with Standard Controls** Works seamlessly with common motor starters, variable frequency drives (VFDs), and protective relays.

8. **Good Thermal Protection** Most Reliance motors come with built-in thermal overload protection to prevent damage from overheating.

1. **Limited Variable Speed Capability** Being a fixed-speed AC induction motor, it does not offer inherent speed control unless paired with an external VFD, which adds cost.

2. **No Brushless Design** Traditional AC induction motors require brushes or slip rings in some configurations, leading to potential wear over time (though this motor is likely brushless).

3. **Higher Initial Cost Than Single-Phase Motors** A 5HP three-phase motor is more expensive upfront than a single-phase equivalent, though it provides better efficiency and power.

4. **Dependence on Three-Phase Power** If your facility lacks three-phase power, you may need additional equipment (e.g., a phase converter) to run it, increasing complexity and cost.

5. **Standard Efficiency (Not Premium IE3/IE4)** This motor likely falls under older efficiency standards (IE2), meaning it may consume slightly more energy compared to newer, high-efficiency models.

6. **Potential Lead Times for Replacement Parts** While Reliance parts are widely available, some specialized components may require ordering from distributors, leading to delays.

7. **Noise and Vibration** Like most AC motors, it may produce some operational noise and vibration, which could be an issue in sensitive environments.

8. **Not Ideal for High-Speed or Precision Applications** If your application requires exact speed control or high RPM precision, a servo motor or VFD-controlled motor may be more suitable.

---

The **Reliance 21410-5 5HP 230V/460V 3-phase AC motor** is a **solid, cost-effective choice** for general industrial applications where reliability, dual-voltage flexibility, and standard NEMA compatibility are priorities. It excels in **pumps, compressors, conveyors, and fans** where a fixed-speed, mid-range horsepower motor is needed. However, if **energy efficiency, variable speed control, or ultra-low maintenance** are critical, newer IE3/IE4 motors or VFD-compatible models may be preferable.

For most **small to medium industrial setups with three-phase power**, this motor offers a **good balance of performance, durability, and affordability**. If your application requires **precise speed control or high efficiency**, consider supplementing it with a VFD or exploring higher-efficiency alternatives.

---

- You need a **reliable, dual-voltage (230V/460V) 5HP motor** for standard industrial applications.

- Your facility has **three-phase power** and requires a **fixed-speed, mid-range horsepower motor**.

- You prioritize **brand reputation, ease of maintenance, and compatibility with common industrial equipment**.

- Budget constraints make it a **practical choice** over premium efficiency models.

- You require **variable speed control** (pair with a VFD or choose a VFD-compatible motor).

- **Energy efficiency** is a top priority (look for IE3/IE4 certified motors).

- Your application demands **higher RPM or precision speed control** (servo motors may be better).

- You operate in a **single-phase environment** (a single-phase motor or phase converter may be necessary).

**Final Verdict:** This motor is a **strong, dependable option** for most standard industrial needs, but assess your specific requirements before purchasing. If in doubt, consult an electrician or motor specialist to ensure it meets your application s exact demands.

Details:

USED AND TESTED IN GOOD CONDITION, FOR DISCOUNTS SHIPPING 248 807 5405 CONDITION.

part #: 214105 prices

• $149.99-$399.99

specifications momaequ:

• brand: Reliance
• mpn: 21410-5
• part type: Ac 5hp 230v Motor
• actual rated input voltage: 230 V
• full load amps: 5.1
• ac frequency rating: 60 Hz
• base rpm: 3450
• ac motor type: Induction/asynchronous
• mounting type: Foot-mounted
• definite purpose motor type: Close-coupled Pump Motor
• current type: Ac
• service factor: 1.15
• ac phase: Three Phase

general momaequ:

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

payments momaequ:

• other
• wallet: Paypal
• credit card: Visa

shipping momaequ:

• cost: $187.00
• type: Fixed
• service: Flat Rate Freight
• class: Freight

returns momaequ:

• policy: No Returns

seller momaequ:

• city: Milford, Michigan
• rating: 100.0%
• # reviews: 11

offer momaequ:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0
• started: April 4, 2026

Reliance 21410-5 Is Similar To:

• 116696 Reliance Hp Phase Motor Bb Reduced (42.1% similar) Shaft diameter photos are actual ships truck. I am out of room with good stuff so significantly discounting many electric motors...(August 15th, 2018)
• 1513 Baldor Reliane Reliance Washdown Motor (29.3% similar) 3 phase 4 hp 1750 rpm see photo of data plate missing original box...(September 28th, 2018)
• 1514 Reliance Hp Electric Motor For Hazardous Locations (35.9% similar) Frame l 182T 126 lbs 1160 rpm TEFL...(September 28th, 2018)
• 1843642813 Reliance Electric Motor For Picker Gamma Camera (30.5% similar) ...(November 13th, 2018)
• 29ux34 Baldor Reliance General Purpose Nema Invertor Motor (35.1% similar) Shipping as it is quoted for the lower 48 states excluding AK, hi and all us protectorates APO. Your phone number is required for contact prior to delivery purposes. If major damage, total loss is present do not accept the delivery but note severe damage and rejected on proof of form prior to ...(September 6th, 2018)
• 29ux45 Baldor Reliance General Purpose Inverter Rated Super Motor (31.9% similar) 13 seer single-package air conditioners and split system heat pumps packaged may not be installed in any state are only sold for replacement parts. Although rare, minor dings and scratches can happen but will not harm the operation of equipment. This listing includes everything you see above. Your...(November 2nd, 2018)
• 35e022n568g1 Baldor Reliance New Electric Motor Hp (34.1% similar) Class b motor service factor ambient temp. 40 degrees c motor shaft rotation cw cc DOA. Cc number CC031A includes conduit box manufacturers warranty length 1 yr shaft less overall motor design keyed rpm range standards ul, CSS duty continuous efficiency group energy efficient nominal. Rpm group ...(August 17th, 2018)
• 35g725-6318 Baldor Reliance Electric Complete Motor (27.4% similar) 1725RPM Balder motor...(September 5th, 2018)
• 35q278y732 Baldor Reliance Industrial Motor (29.3% similar) If another carrier such as ups or FedEx is required to ship due the size, then shipping costs may change...(September 11th, 2017)
• 35s609m512h1 Baldor Reliance Washdown Motor With Extras (29.7% similar) Appears to be unused. Comes with some extra plumbing pieces. The power cord is still in plastic...(December 4th, 2018)
• 35x278p920g1 Baldor Reliance Washdown Duty Motor Hp Teao Frame (37% similar) ...(October 16th, 2018)