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Marathon 3 Phase Motors

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Marathon 3 Phase Motors

Marathon Electric’s three‑phase motors are built for industrial reliability. At Square One Electric Motors & Pumps, our Marathon Three Phase Motor collection offers general‑purpose, severe‑duty, explosion‑proof, inverter‑rated, and high‑efficiency NEMA and IEC motors.

These motors deliver:

  • High energy efficiency (NEMA Premium®, IE3 standards)

  • Cast‑iron heavy‑duty construction to reduce vibration

  • Inverter‑ready insulation and thermal protection

  • Wide voltage range (208–230 V & 460 V in 60 Hz)

  • Service factor 1.15 (higher under sine‑wave power)

Why Choose Marathon Three‑Phase Motors?

⚡ Efficiency & Energy Savings

Marathon’s motors meet NEMA Premium® efficiency and IE3 certification, offering up to 94% motor efficiency for long‑term cost savings.

🛠️ Inverter‑Duty & VFD Ready

Most motors are squirrel‑cage induction, inverter rated and support constant torque operation, ideal for using with VFDs on conveyors, fans, pumps, or hoists.

🧱 Built for Severe Duty

Heavy cast‑iron design, epoxy coatings, extended grease tubes, shaft slingers, and bearing current protection suit harsh environments—from chemical plants and paper mills to refineries and marine duty applications.

🌡️ Thermal Protection & Insulation

Integrated thermostats, MAX GUARD® Class F or H insulation systems, and high‑temperature ratings allow safe, continuous operation in demanding conditions.

🧃 Wide HP & Frame Range

From fractional HP (0.5 HP in 56C frame) to 150 HP in 445T, Marathon’s three‑phase line covers varied needs—TEFC, TENV, flame‑proof, IEC, C‑face options are all available.

🔧 Common Applications

These motors are perfect for:

  • Pumps, compressors, and fans in HVAC, water, oil & gas

  • Conveyors, cranes, hoists in manufacturing

  • Severe‑duty processing in food, chemical, or mining plants

  • Explosion‑proof installations in hazardous environments

  • Inverter‑ controlled equipment for variable speed performance

📝 Product Highlights

Marathon General Purpose NEMA Premium Series

– Available from ½ HP to 650 HP, voltage 208–460 VAC, NEMA frames 56–508.
– TEFC or ODP options, UL Recognized, CSA Certified, and NEMA Premium® efficiency.
– Ideal for pumps, conveyors, blowers and machine tools.

Marathon Severe Duty Motors

– Cast‑iron frames, up to 250 HP, 10:1 variable torque, high service factor, IEC/NEMA standards.
– Designed for chemical, industrial, food processing, and rugged use environments.

Explosion‑Proof and Encoder Models

– Marathon’s EPFC and TEBC explosion‑proof motors in 326T/TC frames, up to 30 HP.
– Include encoders, thermostats, and optimized for inverter use in hazardous locations.

🧭 How to Choose the Right Marathon Motor

1. Horsepower & RPM

Choose the proper HP and speed (1200, 1800, 3500 RPM) to match your machinery.

2. Voltage & Phase

Ensure compatibility: standard is 230/460V, 60 Hz, 3‑phase.

3. Enclosure Type

Decide between TEFC, TENV, or explosion‑proof models depending on environment.

4. Mounting & Frame

Rigid base vs. C‑Face mounting; NEMA vs IEC frame type.

5. Inverter Use

If running a VFD, choose inverter‑rated motors with suitable insulation class.

6. Efficiency & Compliance

Prefer NEMA Premium or IE3 rated motors for energy savings and regulatory compliance.

Contact our Square One experts with any questions!

❓ FAQs

Q: Can Marathon three phase motors be used with VFDs?
Yes—most are inverter‑rated with appropriate insulation (F or H) and thermostats, enabling variable torque applications without derating.

Q: What efficiency can I expect?
Efficiency ranges from about 90–94.5%, with higher HP models reaching NEMA Premium or IE3 levels.

Q: Are these motors suitable for severe‑duty environments?
Absolutely. The Severe Duty line includes cast‑iron construction, epoxy paint, extended grease tubes, and other rugged features.

Q: What service factor do Marathon motors have?
Typically 1.15 under sine‑wave power, and 1.0 under IGBT drive, which means you get some overload capability.

✅ Reach Out!

  • Get a Quote: Need 10 HP or larger? Get volume pricing and lead‑time estimate now. Fast quoting and friendly service at 302.678.0400!

  • Need Help Choosing?: We're here to assist! Contact our motor experts today.

🧾 Example Products & Specifications

Here are just a few Marathon motor models you might see in the collection:

  • General Purpose NEMA Premium, 1–650 HP, 230/460 VAC, 56–508 frames, TEFC or ODP

  • Marathon Severe Duty Cast‑Iron motors, 3–250 HP, 10:1 VT, inverter rated

  • Explosion‑proof models like 326TTGS6578CR (30 HP, EPFC, Class I & II hazardous locations)

  • Heavy‑duty models like 445TTFN6036 (150 HP, 460 VAC, ball bearings, rigid base)

Final Thoughts

Marathon three‑phase motors—available at Square One—offer unmatched reliability, efficiency, and inverter compatibility. Whether you're outfitting pumps, conveyors, fans, or equipment in harsh environments, Marathon’s cast‑iron NEMA-certified designs serve across industries.

👉 Shop now, or contact our experts to find the ideal motor for your application!