The Century B387 Air Compressor Motor is a powerful single-phase motor designed for high-demand air compressor applications. Delivering 6 HP (4.5 kW) output power at 230 volts and operating at 3450–3600 RPM, this motor is engineered for durability and consistent performance. Its capacitor start, capacitor run design provides reliable torque and smooth startups, while the service factor of 1.00 ensures stable operation under rated loads. Built with a Class F insulation system and thermal protection, the motor is safeguarded against overheating during continuous duty cycles.

This model is built on a R56Y frame with a rigid base mounting, offering secure installation and compatibility with a wide range of air compressor systems. The drip-proof enclosure (DP) protects the motor from dust and debris, making it suitable for indoor environments where ventilation is available. Both the drive end and opposite drive end bearings are ball-type, ensuring long-lasting operation with minimal maintenance. The motor’s keyed shaft (0.875” diameter, 2.31” extension) allows for secure coupling with compressor pulleys.

With certifications including UL Recognized and CSA approval, the Century B387 meets strict safety and performance standards. Its rolled steel frame construction ensures structural integrity, while the thermally protected design adds an extra layer of reliability. Compact yet powerful, this motor measures 14.56” overall length and 8.75” frame length, making it a trusted replacement or upgrade choice for demanding air compressor systems.

Key Highlights

• 6 HP, 230V, 3600 RPM, single-phase air compressor motor

• Capacitor start/capacitor run design for high starting torque

• Rigid base, drip-proof (DP) enclosure with rolled steel frame

• Keyed shaft (0.875" diameter, 2.31" extension) for secure drive connection

• Thermally protected, Class F insulation, UL & CSA recognized