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Marathon HJN 280M-2

Series: HJN

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With the HJN 280M-2, Marathon offers a three-phase induction motor in the HJN series. The rated output is 90 kW. The motor is two-pole, which at 50 Hz gives a synchronous speed of 3,000 rpm. The rated voltage is 415 V. The housing is frame size 280 M in foot-mounted form. The protection class is IP55. The efficiency is 95.4 per cent at full load, 95 per cent at 75 per cent load and 93.8 per cent at half load. The mounting arrangement to IEC 60034-7 is B5. The motor is built in China. The values are recorded in the Australian MEPS registration under the GEMS Determination 2019; measured to IEC 60034-2-1 (Edition 2.0). The HJN series covers 10 models. Rated output within it ranges from 11 to 160 kW; the HJN 280M-2 sits in the middle of that range with 90 kW. Its immediate neighbours are the HJN 250Mx-2 below it with 75 kW and the HJN 280M2-4 above it with 110 kW. 499 Marathon models across 3 series are on record.

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 output90 kWcorrect

Electrical data

Rated voltage415 Vcorrect
Number of poles2correct
Protection classIP55correct
Frame size280 M (foot)correct
Mounting (IEC 60034-7)B5correct
Efficiency at full load95.4 %correct
Efficiency at 75 % load95 %correct
Efficiency at half load93.8 %correct

Origin and approval

Country of manufactureChinacorrect

Other data

Standard appliedGreenhouse and Energy Minimum Standards (Three Phase Electric Motors) Determination 2019correct
Test methodIEC 60034-2-1 (Edition 2.0)correct

Frequently asked questions

How much power does the Marathon HJN 280M-2 have?

The Marathon HJN 280M-2 delivers 90 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.

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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 250Mx-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

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