Marathon K381 Motor
The Marathon K381 is a high-performance 1/2 HP three-phase motor engineered for heavy-duty HVACR applications, specifically within commercial fan and blower systems. This 56 frame blower motor operates at a synchronous 1725 RPM, delivering consistent torque for both belt drive fan motor and direct drive configurations. Designed with an open drip proof (ODP) enclosure, it ensures optimal air handler motor cooling while protecting internal components from moisture in standard indoor environments. As a direct replacement for H275V2, the K381 features a resilient base mount to effectively dampen vibration and minimize noise during operation. Its ball bearing construction supports long-term reliability and allows for flexible all-angle mounting. This motor is versatile across 208-230/460V power supplies, making it a staple for contractors maintaining exhaust fans and commercial ventilation units. With a 1.25 service factor and reversible rotation (CCW/CW), it provides the technical adaptability required for demanding field retrofits and precision airflow management.
Key Benefits:
- Enhanced Compatibility: Serves as the primary H275V2 replacement motor, ensuring a seamless fit for aging HVAC blower motor assemblies without the need for mounting modifications.
- Vibration Dampening: The resilient base absorbs mechanical oscillations, which is critical for reducing decibel levels in commercial fan and blower applications.
- Multi-Voltage Versatility: Dual-voltage 208-230/460Vac capability allows this 56 frame motor to be integrated into diverse three-phase electrical systems.
- Rugged Reliability: Features double sealed ball bearings and a rolled steel frame designed for continuous duty industrial performance.
Common Questions:
Is the Marathon K381 suitable for variable frequency drive (VFD) applications?
Yes, as a three phase motor, it is inherently compatible with VFD motor controls, provided the drive is programmed to match the 1725 RPM and 460V / 230V nameplate parameters.
What are the shaft dimensions for this motor?
This unit features a standard 5/8-inch diameter keyed shaft with a 1.88-inch extension, making it compatible with most standard belt drive pulleys.
Does this motor include thermal overload protection?
The K381 is a non-thermally protected motor, meaning external overload protection must be provided through the motor starter or control panel circuit.
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.
Marathon K381 Motor
The Marathon K381 is a high-performance 1/2 HP three-phase motor engineered for heavy-duty HVACR applications, specifically within commercial fan and blower systems. This 56 frame blower motor operates at a synchronous 1725 RPM, delivering consistent torque for both belt drive fan motor and direct drive configurations. Designed with an open drip proof (ODP) enclosure, it ensures optimal air handler motor cooling while protecting internal components from moisture in standard indoor environments. As a direct replacement for H275V2, the K381 features a resilient base mount to effectively dampen vibration and minimize noise during operation. Its ball bearing construction supports long-term reliability and allows for flexible all-angle mounting. This motor is versatile across 208-230/460V power supplies, making it a staple for contractors maintaining exhaust fans and commercial ventilation units. With a 1.25 service factor and reversible rotation (CCW/CW), it provides the technical adaptability required for demanding field retrofits and precision airflow management.
Key Benefits:
- Enhanced Compatibility: Serves as the primary H275V2 replacement motor, ensuring a seamless fit for aging HVAC blower motor assemblies without the need for mounting modifications.
- Vibration Dampening: The resilient base absorbs mechanical oscillations, which is critical for reducing decibel levels in commercial fan and blower applications.
- Multi-Voltage Versatility: Dual-voltage 208-230/460Vac capability allows this 56 frame motor to be integrated into diverse three-phase electrical systems.
- Rugged Reliability: Features double sealed ball bearings and a rolled steel frame designed for continuous duty industrial performance.
Common Questions:
Is the Marathon K381 suitable for variable frequency drive (VFD) applications?
Yes, as a three phase motor, it is inherently compatible with VFD motor controls, provided the drive is programmed to match the 1725 RPM and 460V / 230V nameplate parameters.
What are the shaft dimensions for this motor?
This unit features a standard 5/8-inch diameter keyed shaft with a 1.88-inch extension, making it compatible with most standard belt drive pulleys.
Does this motor include thermal overload protection?
The K381 is a non-thermally protected motor, meaning external overload protection must be provided through the motor starter or control panel circuit.
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
Shipping & Returns
Shipping & Returns
Description
The Marathon K381 is a high-performance 1/2 HP three-phase motor engineered for heavy-duty HVACR applications, specifically within commercial fan and blower systems. This 56 frame blower motor operates at a synchronous 1725 RPM, delivering consistent torque for both belt drive fan motor and direct drive configurations. Designed with an open drip proof (ODP) enclosure, it ensures optimal air handler motor cooling while protecting internal components from moisture in standard indoor environments. As a direct replacement for H275V2, the K381 features a resilient base mount to effectively dampen vibration and minimize noise during operation. Its ball bearing construction supports long-term reliability and allows for flexible all-angle mounting. This motor is versatile across 208-230/460V power supplies, making it a staple for contractors maintaining exhaust fans and commercial ventilation units. With a 1.25 service factor and reversible rotation (CCW/CW), it provides the technical adaptability required for demanding field retrofits and precision airflow management.
Key Benefits:
- Enhanced Compatibility: Serves as the primary H275V2 replacement motor, ensuring a seamless fit for aging HVAC blower motor assemblies without the need for mounting modifications.
- Vibration Dampening: The resilient base absorbs mechanical oscillations, which is critical for reducing decibel levels in commercial fan and blower applications.
- Multi-Voltage Versatility: Dual-voltage 208-230/460Vac capability allows this 56 frame motor to be integrated into diverse three-phase electrical systems.
- Rugged Reliability: Features double sealed ball bearings and a rolled steel frame designed for continuous duty industrial performance.
Common Questions:
Is the Marathon K381 suitable for variable frequency drive (VFD) applications?
Yes, as a three phase motor, it is inherently compatible with VFD motor controls, provided the drive is programmed to match the 1725 RPM and 460V / 230V nameplate parameters.
What are the shaft dimensions for this motor?
This unit features a standard 5/8-inch diameter keyed shaft with a 1.88-inch extension, making it compatible with most standard belt drive pulleys.
Does this motor include thermal overload protection?
The K381 is a non-thermally protected motor, meaning external overload protection must be provided through the motor starter or control panel circuit.
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.
