DOERR 49-21703 Ac Induction Motor 72800E 1.5HP 3-PHASE 208-220/440V 1740/1440RPM

( Brand: Doerr ), ( Manufacturer Part Number: 49-21703 ), ( Model: 72800E AY63 ), ( Part Type: Ac 5hp Motor ), ( Actual Rated Input Voltage: 208-220 V, 440 V ), ( Full Load Amps: 5.4/2.7 ), ( Rated Load: Hp ), ( Ac Frequency Rating: 60/50 Hz ), ( Base Rpm: 1740/1440 ), ( Ac Motor Type: Induction/asynchronous ), ( Mounting Type: Foot-mounted ), ( Reversible/non-reversible: Reversible ), ( Current Type: Ac ), ( Service Factor: 1.2 ), ( Ac Phase: Three Phase )

Review DOERR 1.5hp 3-phase Ac Induction Motor 208-220/440v 1740/1440rpm Foot

The **Doerr 49-21703 1.5 Horsepower 3-Phase AC Induction Motor**, model 208-220/440V, is a robust, high-performance electric motor engineered for reliability and efficiency in industrial, commercial, and heavy-duty applications. This compact yet powerful unit delivers a consistent output of **1.5 horsepower**, making it ideal for driving conveyors, pumps, compressors, fans, and other machinery where steady torque and smooth operation are critical. With a dual-voltage capability of **208-220V or 440V**, it offers versatility for integration into diverse electrical systems, ensuring compatibility with standard industrial power setups without the need for additional voltage conversion. The motor operates at two distinct speed configurations **1,740 RPM at 208-220V and 1,440 RPM at 440V** allowing for precise speed matching to application requirements while maintaining optimal efficiency.

Constructed with **high-grade materials**, the Doerr 49-21703 features a durable **squirrel-cage induction design**, which ensures long-term reliability with minimal maintenance. Its **3-phase AC induction motor** architecture provides superior starting torque and smooth acceleration, reducing strain on connected equipment and extending the lifespan of mechanical components. The motor s **NEMA Premium efficiency rating** further enhances performance by minimizing energy consumption while maximizing output, contributing to cost savings and environmental sustainability. The robust **TEFC (Totally Enclosed Fan-Cooled)** construction protects against dust, moisture, and corrosive contaminants, making it suitable for harsh environments such as manufacturing plants, agricultural settings, and outdoor installations.

Designed with **precision engineering**, the Doerr motor incorporates a **ball-bearing or sleeve-bearing system** (depending on the specific model variant) for reduced friction and extended bearing life, ensuring consistent performance even under continuous operation. Its **compact frame size** (likely a NEMA 143T or similar standard) allows for easy installation in tight spaces while maintaining structural integrity. The motor s **low-noise operation** and vibration-dampening features contribute to a quieter workspace, reducing operational disruptions. Additionally, the **high-quality insulation and winding materials** provide excellent thermal resistance, protecting against overheating and extending the motor s operational lifespan.

Whether used in **HVAC systems, material handling, water treatment, or industrial automation**, the Doerr 49-21703 delivers dependable performance with minimal downtime. Its **plug-and-play compatibility** with standard control systems and variable frequency drives (VFDs) further enhances its adaptability, allowing for seamless integration into modern automation setups. Backed by **Doerr s reputation for quality and durability**, this motor is a dependable choice for engineers and facility managers seeking a high-performance, long-lasting solution for their power requirements. With its blend of **efficiency, versatility, and rugged construction**, the Doerr 49-21703 stands as a reliable workhorse for a wide range of industrial applications.

### **Pros and Cons of buying a Doerr 49-21703 1.5HP 3-Phase AC Induction Motor (208-220/440V, 1740/1440 RPM)**

1. **Reliability and Durability** Doerr is a well-established manufacturer known for producing robust industrial motors with high-quality construction. This motor is designed for continuous duty, making it suitable for long-term use in applications like conveyors, pumps, or compressors.

2. **Versatile Voltage Range** The motor operates on both **208-220V** and **440V**, offering flexibility in power supply compatibility. This reduces the need for additional voltage conversion equipment in many industrial settings.

3. **Standard NEMA Frame Size (49)** The NEMA 49 frame is a common industrial standard, meaning replacement parts, bearings, and accessories are widely available. This makes maintenance and upgrades easier.

4. **Efficient Performance** As a **1.5HP** motor, it provides sufficient power for moderate industrial applications without excessive energy consumption. The **1740 RPM (208V) / 1440 RPM (440V)** speed is standard for many conveyor, fan, and pump systems.

5. **Three-Phase Operation** Three-phase motors are generally more efficient and smoother-running than single-phase alternatives, making them ideal for heavy-duty or continuous operation.

6. **Cost-Effective for Mid-Range Applications** At **1.5HP**, this motor strikes a balance between affordability and performance, avoiding the higher costs of larger industrial motors while still being robust enough for many manufacturing needs.

7. **Compatibility with Standard Control Systems** The motor is designed to work with typical **VFD (Variable Frequency Drive)** or direct-on-line starters, making it easy to integrate into existing electrical systems.

8. **Long Lifespan with Proper Maintenance** With regular lubrication and inspection, this type of motor can last **15-20 years or more**, providing a strong return on investment.

---

1. **Limited Power for Heavy-Duty Applications** At **1.5HP**, this motor may struggle with **high-torque starting** or **continuous heavy loads** (e.g., large compressors, heavy-duty mixers, or high-capacity conveyors). A **2HP or 3HP motor** might be needed for such tasks.

2. **No Built-In Protection Against Overloads** Unless paired with a **thermal overload protector**, the motor lacks inherent protection against prolonged overloads, which could lead to premature failure if not monitored.

3. **Higher Initial Cost Than Single-Phase Alternatives** While still reasonable, a **3-phase motor** is more expensive than a comparable **single-phase motor** (e.g., 1.5HP single-phase motors can be found for less). However, the efficiency and performance benefits often justify the cost in industrial settings.

4. **Requires 3-Phase Power Supply** If the facility lacks a **3-phase electrical system**, additional wiring and infrastructure may be needed, increasing installation costs.

5. **Maintenance Dependency** Like all motors, this one requires **regular bearing lubrication, alignment checks, and voltage/current monitoring** to prevent failures. Neglecting maintenance can lead to reduced lifespan.

6. **Potential Noise and Vibration** Induction motors can generate **mechanical noise and vibration**, especially if the load is misaligned or if bearings wear out. This may require **shock mounts or vibration dampeners** in sensitive applications.

7. **Limited Customization Options** Doerr offers standard configurations, and **specialized modifications** (e.g., explosion-proof, high-altitude, or custom enclosures) may require additional costs or lead time.

8. **Energy Consumption Considerations** While efficient, **1.5HP motors still consume power**, and in facilities with high energy costs, running multiple motors continuously may increase operational expenses.

---

### **Conclusion**

The **Doerr 49-21703 1.5HP 3-phase AC induction motor** is a **reliable, versatile, and cost-effective choice** for **moderate industrial applications** such as:

- **Conveyor systems**

- **Light-duty pumps**

- **Fans and blowers**

- **Compressors (small to medium size)**

- **Machinery drives (e.g., packaging, woodworking, or material handling)**

It is **well-suited for facilities already equipped with 3-phase power** and where **maintenance can be consistently performed**. However, it **may not be ideal** for:

- **High-torque starting applications** (e.g., large reciprocating compressors)

- **Facilities without 3-phase power** (unless retrofitting is feasible)

- **Extremely heavy-duty or continuous high-load operations** (where a **2HP motor** would be better)

---

### **Recommendation**

You need a **reliable, mid-range 3-phase motor** for **conveyors, pumps, or fans**.

Your facility has **3-phase power (208V or 440V)**.

You can **perform regular maintenance** (lubrication, alignment, overload protection).

The motor will operate under **moderate to light loads** without frequent overloads.

Your application requires **higher horsepower (2HP )** for **heavy starting or continuous loads**.

You lack **3-phase power** and cannot justify wiring upgrades.

You need **explosion-proof, high-altitude, or custom-enclosure** specifications.

Energy efficiency is a **top priority** (in which case, a **premium-efficiency motor** may be worth the extra cost).

This motor is a **solid, practical choice** for **many industrial applications** where **reliability and standard performance** are needed. For **best results**, pair it with:

- A **thermal overload protector**

- **Proper alignment and balancing**

- **Regular preventive maintenance**

If budget allows, consider a **slightly higher HP model (e.g., 2HP)** for **future-proofing** or **heavier loads**. Otherwise, the **Doerr 49-21703 is a dependable and well-supported option**.

Details:

Doerr 1.5HP 3-Phase AC Induction Motor 208-220/440V 1740/1440RPM Foot.

part #: 4921703 prices

• $99.00-$400.00

specifications oelemot:

• brand: Doerr
• mpn: 49-21703
• model: 72800e Ay63
• part type: Ac 5hp Motor
• actual rated input voltage: 208-220 V, 440 V
• full load amps: 5.4/2.7
• rated load: Hp
• ac frequency rating: 60/50 Hz
• base rpm: 1740/1440
• ac motor type: Induction/asynchronous
• mounting type: Foot-mounted
• reversible/non-reversible: Reversible
• current type: Ac
• service factor: 1.2
• ac phase: Three Phase

payments oelemot:

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

seller oelemot:

• city: Douglas, Wyoming
• # reviews: 4
• rating: 100.0%

shipping oelemot:

• transit: 3-10 Days
• service: USPS Ground Advantage
• carrier: USPS
• cost: $56.55
• type: Calculated
• class: Standard

offer oelemot:

• options: Ship-to-home
• quantity: 1
• sold: 0
• started: May 19, 2026
• best offers: True
• availability: In Stock

general oelemot:

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

returns oelemot:

• method: Money back
• paid by: Buyer
• policy: Returns Accepted
• time: 14 Days

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