Regal Rexnord - Marathon Three Phase Motors

Regal Rexnord – Marathon Three Phase Motors: Industrial Power You Can Count On

When it comes to dependable, high-efficiency three phase motors, Regal Rexnord – Marathon stands among the most trusted names in industrial motor manufacturing. Marathon Electric, now part of the broader Regal Rexnord family, brings over 110 years of engineering expertise to its three phase motor lineup — a heritage that translates directly into products built for the demands of real-world industrial environments.

A Wide Range of Three Phase Motor Options

Browse the full Three Phase Motors category and you'll find that Marathon's lineup spans an impressive range of configurations. Available from fractional horsepower up to 650 HP, and covering NEMA frames 56 through 508, these motors are engineered to cover virtually any industrial application. Voltage options spanning 208–460 VAC ensure compatibility with the most common power systems in North American facilities.

Enclosure types include both Totally Enclosed Fan-Cooled (TEFC) and Open Drip-Proof (ODP) designs, giving engineers and technicians the flexibility to match the motor to the operating environment — whether that's a clean machine shop or a moisture-laden processing facility. TEFC models in particular are well regarded for protecting internal components against dust, dirt, and moisture, making them a go-to choice for demanding outdoor or washdown-adjacent applications.

Key Technologies and Features

What sets Marathon's three phase motors apart is a focus on both efficiency and durability. Highlights of the lineup include:

• NEMA Premium® Efficiency & IE3 Certification — Marathon's motors meet NEMA Premium® efficiency and IE3 certification, delivering up to 94% motor efficiency for meaningful long-term energy cost reductions.
• MAX GUARD® Insulation Systems — Integrated Class F or Class H insulation systems, combined with high-temperature ratings, allow safe, continuous operation in thermally demanding conditions.
• Inverter-Ready (VFD Compatible) Design — Most motors are squirrel-cage induction types that are inverter rated and support constant torque operation, making them ideal for use with variable frequency drives on conveyors, fans, pumps, and hoists.
• TerraMAX® IEC Motors — The TerraMAX® series combines IEC Design N and NEMA Design B torque profiles with IE3/NEMA Premium efficiency, with global voltage and frequency compatibility for versatile deployment.
• Severe-Duty & Explosion-Proof Options — Heavy cast-iron frames, epoxy coatings, extended grease tubes, shaft slingers, and bearing current protection suit harsh environments from chemical plants and paper mills to refineries. Explosion-proof EPFC and TEBC models (up to 30 HP) are available for hazardous locations.
• NEMA Design B Construction — Delivers the high starting torque and low starting current profile needed for direct-across-the-line starting in general-purpose industrial applications.

Applications Built Into the Design

Marathon three phase motors are engineered with specific end-use applications in mind. Whether powering pumps, compressors, conveyors, blowers, cooling towers, machine tools, or hoists, these motors are sized and specified to perform continuously under rated load. UL Recognized and CSA Certified listings further ensure they meet safety standards across a broad range of installations.

With 81 products in our catalog spanning the full breadth of the Marathon three phase motor lineup, this is a comprehensive resource for anyone sourcing industrial electric motors with confidence in quality, efficiency, and long-term reliability.