Marathon HJN 250Mx-2
Series: HJN
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Marathon HJN – electric motor range: frame sizes 132 to 315, 11 to 160 kW, 2- to 4-pole, 400/415 V, all rated at High Efficiency Level 2005 (IE2), MEPS registration
Marathon Electric, according to the company's own history founded in 1893 in Wausau, Wisconsin, has belonged since 2021 to Regal Rexnord, the US drive-technology group formed from the merger of Regal Beloit with parts of Rexnord. This page covers the HJN range, whose type designations begin with the IEC frame size (132, 160, 180, 200, 250, 280, 315), followed by the construction form (M, L) and the pole count; the additional letters x, y and the digit 2 on the larger frame sizes distinguish variants of the same frame size but a different power step.
Read on 3 more paragraphs
The register lists here 10 versions with 11 to 160 kW, two- to four-pole, at voltages of 400 to 415 V. Full-load efficiencies range from 91.8 to 95.9%, and at 75% load from 91.7 to 95.9%. Frame sizes run from 132 to 315, protection and mounting are uniform at IP55 and B5. Manufacturing is exclusively in China, testing followed the 2019 GEMS determination with test method A; all ten motors reach the 2005 High Efficiency Level, roughly equivalent to class IE2.
The HJN range thus covers the mid to large power segment of the Marathon programme, used for pumps, fans, compressors and conveying plant in industry and agriculture; within the Regal Rexnord group the brand stands, alongside Leeson and Rexnord, for drive technology for the North American and Australia-Pacific markets.
When buying used, bearing condition and a checked insulation resistance of the winding, visible overheating marks on the terminal box and fan cover, the condition of shaft and key, and a legible nameplate with frame size, pole count and the High Efficiency Level marking all matter. Spares and service run through the Regal Rexnord network.
Sources: SpecCodex register, model data: Marathon HJN
Technical data
Engine
| Rated output | 75 kWcorrect |
|---|
Electrical data
| Rated voltage | 400 Vcorrect |
|---|---|
| Number of poles | 2correct |
| Protection class | IP55correct |
| Frame size | 250 M (foot)correct |
| Mounting (IEC 60034-7) | B5correct |
| Efficiency at full load | 95.3 %correct |
| Efficiency at 75 % load | 95.1 %correct |
| Efficiency at half load | 94.3 %correct |
Origin and approval
| Country of manufacture | Chinacorrect |
|---|
Other data
| Standard applied | Greenhouse and Energy Minimum Standards (Three Phase Electric Motors) Determination 2019correct |
|---|---|
| Test method | IEC 60034-2-1 (Edition 2.0)correct |
Frequently asked questions
How much power does the Marathon HJN 250Mx-2 have?
The Marathon HJN 250Mx-2 delivers 75 kW.
What to check before buying
- Match the data plate against the order: frame size, mounting and rating have to agree.
- Check the ingress rating against the installation site — outdoors or in dust the demands differ.
- Hold the mounting form and dimensions against the existing seat before ordering.
- The pole count sets the speed — when replacing an older unit, compare this first.
- For used units, ask about winding condition and bearing play.
- Ask about parts availability for this series — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 23 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
HJN 132Mx-2
HJN 132My-2
HJN 160Lx-2
HJN 180Lx-2
HJN 200Ly-2
HJN 280M-2
HJN 280M2-4
HJN 315L1-4
HJN 315M-4
Sources: Energy Rating — Australian government equipment register (retrieved August 2026) · How we check the data
Electric motor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
