P28G0400N Reliance Electric Duty‑Master Three‑Phase Induction Motor

The P28G0400N is a heavy‑duty, continuous‑duty three‑phase induction motor from Reliance Electric’s P28 Duty‑Master series, built to NEMA standards for rugged industrial use. It delivers reliable, high‑torque performance for long‑term operation in harsh environments, serving as a robust power source for a wide range of industrial machinery.

The P28G0400N operates on a three‑phase power supply with a standard voltage rating of 230/460 V, compatible with 50 Hz and 60 Hz global industrial systems. It features a 4‑pole winding design, providing a nominal full‑load speed of approximately 1750 RPM at 60 Hz, ideal for medium‑speed, high‑torque applications. The motor uses a Class F insulation system, rated for 155°C maximum operating temperature, ensuring excellent thermal endurance and stable performance under heavy or prolonged loads. It includes a 1.15 service factor, allowing safe short‑term overload without compromising reliability.

Constructed with a rugged 284T NEMA cast‑iron frame, the P28G0400N offers exceptional structural rigidity, minimizing vibration and noise during continuous operation. It features a Totally Enclosed Fan‑Cooled (TEFC) enclosure, shielding internal windings and components from dust, moisture, debris, and liquid splashes—perfect for factory floors, processing plants, and other challenging settings. An external cooling fan and optimized internal ventilation ensure efficient heat dissipation during extended runtime or cyclic loads, preventing heat‑related performance loss.

High‑quality sealed ball bearings at both rotor ends reduce friction, eliminate frequent lubrication needs, and extend service life. The output shaft is precision‑machined with a standard keyway for secure connection to pulleys, gears, couplings, and other transmission components. Designed for foot‑mounted installation, it has standard mounting dimensions for easy alignment and firm attachment to equipment bases.

The P28G0400N incorporates a high‑efficiency squirrel‑cage rotor and precision‑balanced assembly, delivering smooth, consistent torque and low operational noise. Its robust winding design and strict factory quality control ensure low failure rates and stable performance under rated and intermittent overload conditions. The motor is fully compatible with across‑the‑line starters, contactors, and variable frequency drives (VFDs), supporting flexible speed regulation and seamless integration into automated industrial systems.

This motor is widely used in heavy‑duty industrial equipment, including industrial fans, blowers, centrifugal pumps, air compressors, conveyors, mixers, crushers, and general processing machinery. It is an excellent choice for original equipment manufacturing (OEM) and as a direct replacement for aging motors in existing production lines, providing a cost‑effective, reliable solution for industrial power transmission.