
Fasco D503 Motor
The Fasco D503 Motor is a high-performance 1/10 HP 230V 1590 RPM motor designed for continuous duty in demanding HVAC and refrigeration environments. This 3.3-inch diameter general-purpose motor features a Permanent Split Capacitor (PSC) design and comes equipped with a 4 MFD 370V capacitor for optimized starting torque and efficiency. Built for versatility, the Fasco D503 utilizes a reversible rotation configuration and is thermally protected to prevent winding failure during high-ambient operation. The Open Air Over (OAO) enclosure ensures maximum heat dissipation, making it ideal for direct drive blower motors, evaporator fans, and exhaust systems. With sleeve bearings for quiet operation and a 5/16" diameter shaft with a flat, this motor serves as a direct technical replacement for the Century 993 and similar HVAC blower motor models across multiple manufacturers.
Key Benefits
- Broad Compatibility: Replaces common units including the Century 993 and various Dayton and Singer models.
- Flexible Installation: Features reversible rotation and extended mounting studs on both ends for diverse mounting requirements.
- Reliable Protection: Integrated automatic thermal overload protection safeguards the system against overheating.
- Complete Assembly: Includes the required 4 MFD/370V capacitor, simplifying the installation process for technicians.
- Robust Construction: Engineered with a rolled steel shell and Class B insulation rated for 40°C ambient temperatures.
Common Questions
What is the frame size and shaft dimension for the Fasco D503?
The motor utilizes a 3.3-inch frame diameter with a 5/16" x 3-7/8" shaft featuring a single flat for secure blower wheel attachment.
Can this motor be used in refrigeration evaporators?
Yes, this 1590 RPM motor is frequently used in commercial refrigeration and air-moving applications where an air-over-motor duty cycle is required.
Is the rotation directional or reversible?
The D503 is electrically reversible, allowing contractors to match the specific airflow requirements of the existing equipment during field installation.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $243.99
-65%$243.99
$85.40Fasco D503 Motor
The Fasco D503 Motor is a high-performance 1/10 HP 230V 1590 RPM motor designed for continuous duty in demanding HVAC and refrigeration environments. This 3.3-inch diameter general-purpose motor features a Permanent Split Capacitor (PSC) design and comes equipped with a 4 MFD 370V capacitor for optimized starting torque and efficiency. Built for versatility, the Fasco D503 utilizes a reversible rotation configuration and is thermally protected to prevent winding failure during high-ambient operation. The Open Air Over (OAO) enclosure ensures maximum heat dissipation, making it ideal for direct drive blower motors, evaporator fans, and exhaust systems. With sleeve bearings for quiet operation and a 5/16" diameter shaft with a flat, this motor serves as a direct technical replacement for the Century 993 and similar HVAC blower motor models across multiple manufacturers.
Key Benefits
- Broad Compatibility: Replaces common units including the Century 993 and various Dayton and Singer models.
- Flexible Installation: Features reversible rotation and extended mounting studs on both ends for diverse mounting requirements.
- Reliable Protection: Integrated automatic thermal overload protection safeguards the system against overheating.
- Complete Assembly: Includes the required 4 MFD/370V capacitor, simplifying the installation process for technicians.
- Robust Construction: Engineered with a rolled steel shell and Class B insulation rated for 40°C ambient temperatures.
Common Questions
What is the frame size and shaft dimension for the Fasco D503?
The motor utilizes a 3.3-inch frame diameter with a 5/16" x 3-7/8" shaft featuring a single flat for secure blower wheel attachment.
Can this motor be used in refrigeration evaporators?
Yes, this 1590 RPM motor is frequently used in commercial refrigeration and air-moving applications where an air-over-motor duty cycle is required.
Is the rotation directional or reversible?
The D503 is electrically reversible, allowing contractors to match the specific airflow requirements of the existing equipment during field installation.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
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Description
The Fasco D503 Motor is a high-performance 1/10 HP 230V 1590 RPM motor designed for continuous duty in demanding HVAC and refrigeration environments. This 3.3-inch diameter general-purpose motor features a Permanent Split Capacitor (PSC) design and comes equipped with a 4 MFD 370V capacitor for optimized starting torque and efficiency. Built for versatility, the Fasco D503 utilizes a reversible rotation configuration and is thermally protected to prevent winding failure during high-ambient operation. The Open Air Over (OAO) enclosure ensures maximum heat dissipation, making it ideal for direct drive blower motors, evaporator fans, and exhaust systems. With sleeve bearings for quiet operation and a 5/16" diameter shaft with a flat, this motor serves as a direct technical replacement for the Century 993 and similar HVAC blower motor models across multiple manufacturers.
Key Benefits
- Broad Compatibility: Replaces common units including the Century 993 and various Dayton and Singer models.
- Flexible Installation: Features reversible rotation and extended mounting studs on both ends for diverse mounting requirements.
- Reliable Protection: Integrated automatic thermal overload protection safeguards the system against overheating.
- Complete Assembly: Includes the required 4 MFD/370V capacitor, simplifying the installation process for technicians.
- Robust Construction: Engineered with a rolled steel shell and Class B insulation rated for 40°C ambient temperatures.
Common Questions
What is the frame size and shaft dimension for the Fasco D503?
The motor utilizes a 3.3-inch frame diameter with a 5/16" x 3-7/8" shaft featuring a single flat for secure blower wheel attachment.
Can this motor be used in refrigeration evaporators?
Yes, this 1590 RPM motor is frequently used in commercial refrigeration and air-moving applications where an air-over-motor duty cycle is required.
Is the rotation directional or reversible?
The D503 is electrically reversible, allowing contractors to match the specific airflow requirements of the existing equipment during field installation.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.












