GAST 72R645-P112-D303X Fasco Motor Cap Mfd Vac 115VAC 5.3A 60HZ 1/3HP 7.5 370

( Brand: Gast ), ( Manufacturer Part Number: 72R645-P112-D303X ), ( Part Type: Motor Cap ), ( Power Source: Electric ), ( Diaphragm Pump Type: Double Diaphragm Pump ), ( Country Of Origin: United States )

Review GAST 115vac 5.3a 60hz 1/3hp Fasco Motor Cap 7.5 Mfd 370 Vac

The **Gast 72R645-P112-D303X** is a high-performance, single-phase, fractional horsepower electric motor designed for demanding industrial and commercial applications where reliability, efficiency, and durability are paramount. This motor operates at a nominal voltage of **115VAC**, delivering a consistent **5.3 amps** of current at **60Hz**, which translates to a fractional output of **1/3 horsepower (0.33 hp)** ideal for light to moderate load applications such as conveyor systems, small pumps, fans, compressors, and automated machinery. Its robust construction ensures smooth operation under continuous duty cycles, making it a versatile choice for environments where precision and longevity are critical.

One of the standout features of this motor is its **Fasco-branded capacitor**, a **7.5 microfarad ( F) unit rated for 370VAC**, which plays a crucial role in phase correction and starting torque. This capacitor enhances the motor s efficiency by reducing power draw during startup, minimizing energy waste, and extending the lifespan of the motor components. The **D303X** designation suggests a specific shaft configuration or mounting style, likely optimized for easy integration into existing mechanical systems, whether through direct coupling, belt drives, or other transmission methods. The motor s compact yet sturdy design ensures minimal footprint while maximizing performance, making it suitable for installations where space is a consideration.

Built to withstand the rigors of industrial use, the **Gast 72R645-P112** is constructed with high-quality materials that resist corrosion, vibration, and thermal stress. Its sealed bearing system and precision-engineered windings contribute to reduced friction and overheating, ensuring extended operational life even under fluctuating load conditions. Whether deployed in manufacturing plants, HVAC systems, or material handling equipment, this motor delivers consistent torque and speed, maintaining operational integrity over prolonged periods. Additionally, its compatibility with standard control circuits and variable frequency drives (VFDs) allows for flexible speed adjustments, further expanding its utility in applications requiring variable torque control.

For maintenance and serviceability, the motor s design prioritizes accessibility, with features that facilitate easy disassembly and component replacement. The inclusion of a **Fasco capacitor** a trusted brand known for reliability adds an extra layer of assurance, as these components are engineered to handle repeated start-stop cycles without degradation. Overall, the **Gast 72R645-P112-D303X** represents a well-engineered, high-efficiency motor that balances power, durability, and adaptability, making it an excellent investment for industries seeking dependable fractional horsepower solutions.

### **Analysis of the Gast 72R645-P112-D303X Motor (1/3 HP, 115VAC, 5.3A, 60Hz)**

1. **Reliability and Brand Reputation** Gast Manufacturing is a well-established brand in the HVAC and industrial motor market, known for durable, high-quality motors. Their products are widely used in commercial and residential applications, including air handlers, fans, and pumps.

2. **Proper Specifications for Common Applications** The motor is rated at **1/3 HP (250W)**, which is suitable for light-duty to medium-duty tasks such as:

- Small air handlers

- Cabinet fans

- Exhaust blowers

- Light-duty pumps (if properly matched with a pump curve)

- HVAC accessories (e.g., make-up air units, small duct fans)

3. **Capacitor Included (7.5 F, 370VAC)** This motor is **single-phase capacitor-start, single-phase run (C-SCR)**, meaning it includes both a start and run capacitor in one unit. This simplifies installation since you don t need to purchase separate capacitors. The **370VAC rating** ensures compatibility with standard 115VAC systems (though it is designed for **115VAC operation**).

4. **Standard Voltage and Frequency (115VAC, 60Hz)** Widely available and compatible with most North American electrical systems. No need for voltage converters or special wiring.

5. **Compact and Lightweight** At **1/3 HP**, this motor is small and easy to install in tight spaces, making it ideal for retrofits or applications where space is limited.

6. **Energy Efficiency (Relative to Its Class)** While not a premium energy-efficient motor (like NEMA Premium or IE3), it operates efficiently for its power rating and is suitable for applications where high efficiency is not the primary concern.

7. **Easy to Replace Common Failed Motors** Many older HVAC systems and industrial equipment use **1/3 HP single-phase motors**, so this is a **stock replacement part** for many applications.

8. **Low Maintenance Requirements** Gast motors are designed for long-term operation with minimal upkeep, provided they are properly installed and not overloaded.

9. **Compatibility with Standard Control Systems** Works with standard **GFCI-protected circuits, thermal overloads, and magnetic starters** (if required).

10. **Warranty Coverage** Gast typically offers a **limited lifetime warranty** on motors, providing long-term peace of mind.

---

1. **Not High-Efficiency (NEMA Premium or IE3)**

- This is a **standard efficiency motor**, meaning it consumes more energy than **NEMA Premium (IE2) or IE3 (Premium Efficiency)** motors of the same horsepower.

- If energy savings are a priority, a **higher-efficiency motor** (even if slightly more expensive) may be justified over time.

2. **Limited Torque at Low Speeds**

- Single-phase motors (especially capacitor-start types) can struggle with **high starting torque** compared to **three-phase motors** or **permanent split capacitor (PSC) motors** with better starting characteristics.

- If the application requires **frequent starts under load** (e.g., pumping viscous fluids), a **higher-torque motor** (such as a **shaded-pole or PSC motor**) may be better.

3. **Sensitive to Voltage Fluctuations**

- Fail to start

- Overheat

- Have reduced lifespan

- Requires **proper circuit protection** (e.g., fuses, breakers, and possibly a **voltage regulator** in unstable environments).

4. **Not Suitable for Heavy-Duty or Continuous High-Load Applications**

- **1/3 HP is relatively weak** for continuous heavy-duty use (e.g., long-term pumping of water, thick fluids, or high-static-pressure air movement).

- If the application requires **higher horsepower (e.g., HP or HP)**, this motor will struggle and may overheat.

5. **Single-Phase Limitations in Industrial Settings**

- If the system is **three-phase**, a **three-phase motor** would be more efficient and powerful for the same footprint.

- Single-phase motors are **not ideal for high-torque, high-power applications** (e.g., large compressors, conveyors, or high-pressure pumps).

6. **Potential for Overheating in Poorly Ventilated Enclosures**

- Gast motors are **open-drip-proof (ODP) or totally enclosed fan-cooled (TEFC) depending on the model**. If installed in a **confined space without proper airflow**, the motor may overheat.

- Always ensure **adequate ventilation** around the motor.

7. **Higher Initial Cost Than Very Basic Motors**

- While not expensive, it is **more costly than a basic shaded-pole motor** (which is even less efficient but simpler).

- If the application **does not require capacitor-start functionality**, a **shaded-pole or PSC motor** might suffice at a lower cost.

8. **Limited Customization Options**

- Unlike some industrial motors, this Gast motor does **not offer variable speed control (VSD) compatibility** out of the box. If **speed control is needed**, an external **VFD (Variable Frequency Drive)** would be required, adding complexity and cost.

9. **Potential for Capacitor Failure Over Time**

- **Failure to start**

- **Humming noises**

- **Overheating**

- Replacing the capacitor separately can be **more expensive than buying a new motor** if the motor itself is still functional.

10. **Not Ideal for Extreme Environments**

- Unless specified otherwise, this motor is **not explosion-proof, waterproof, or corrosion-resistant**.

- For **wet, dusty, or hazardous locations**, a **NEMA 4X, explosion-proof, or chemically resistant motor** would be required.

---

### **When Is This Motor a Good Choice?**

- **Light-duty HVAC applications** (e.g., small air handlers, cabinet fans, make-up air units)

- **Retrofit replacements** for existing 1/3 HP single-phase motors in residential/commercial systems

- **Low-cost, reliable operation** where high efficiency is not critical

- **Applications with stable 115VAC power supply** (no frequent voltage fluctuations)

- **General-purpose fans, exhaust blowers, and low-pressure pumps**

### **When Should You Avoid This Motor?**

- **High-torque starting applications** (e.g., pumping thick liquids, heavy-duty conveyors)

- **Three-phase systems** (unless converting to single-phase is acceptable)

- **High-efficiency energy-saving projects** (consider NEMA Premium or IE3 motors)

- **Extreme environments** (high humidity, corrosive chemicals, explosive atmospheres)

- **Applications requiring variable speed control** (without adding a VFD)

- **Heavy continuous-duty loads** (e.g., long-term high-pressure air movement)

---

- You need a **reliable, standard-efficiency 1/3 HP single-phase motor** for a **light-duty HVAC or fan application**.

- The **electrical system is stable (115VAC, 60Hz, no frequent surges)**.

- You **do not require high efficiency or variable speed control**.

- It is a **direct replacement for an existing Gast or similar motor** in your system.

- The **application does not involve extreme conditions** (high heat, moisture, or corrosive elements).

- **Higher efficiency is needed** **NEMA Premium (IE2) or IE3 motor** (e.g., **Gast 72R645-P112-D303X with Premium Efficiency** if available, or a **Tecumseh, Baldor, or Lenze motor**).

- **Variable speed control is required** **Add a VFD-compatible motor** (e.g., **Baldor Reliance or Lenze single-phase VFD motor**).

- **Higher torque or power is needed** **Upgrade to HP or HP** (e.g., **Gast 72R645-P112-D303X HP**).

- **Three-phase power is available** **Switch to a three-phase motor** (more efficient and powerful).

- **Explosion-proof or corrosion-resistant motor is required** **NEMA 4X or ATEX-certified motor**.

- **Budget is a concern** **Check for a shaded-pole or basic PSC motor** (e.g., **Gast 72R645-P112-D303X in a lower-cost variant**).

The **Gast 72R645-P

Details:

Free air flow:4.35 cfm 7.4 m3/h. Manufacturer: Gast. Series:71R/72R Twin Cylinder Compressor. Used, sold as is.

Shipping quoted is for the CUS, outside CUS will need to be HI or AK.

part #: 72r645p112d303x prices

• $72.59-$200.00

specifications valvplu:

• brand: Gast
• mpn: 72r645-p112-d303x
• part type: Motor Cap
• power source: Electric
• diaphragm pump type: Double Diaphragm Pump
• country of origin: United States

offer valvplu:

• best offers: True
• started: March 25, 2026
• options: Ship-to-home
• quantity: 4
• availability: In Stock
• sold: 0

shipping valvplu:

• transit: 3-8 Days
• cost: $35.00
• class: Economy
• service: Economy
• type: Fixed

seller valvplu:

• city: Poteet, Texas
• # reviews: 96
• rating: 100.0%

payments valvplu:

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

general valvplu:

• Pumps Pump Accessories > Vacuum Pumps > Diaphragm Pumps
• condition: Used

returns valvplu:

• policy: No Returns

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