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Blue Max Inverter Duty Motors

230/460 VAC | 1 HP - 350 HP | 2000:1 CONSTANT TORQUE

Marathon has a developed a reputation for conservative motor designs and highly engineered products used in a vast array of commercial and industrial applications around the world. The Blue Max three phase motor series is designed for VFD or vector applications requiring full rated torque at zero speed using closed- or open-loop controls. BlueMax It is compatible with Marathon's patented “fracket” which allows for mounting of options such as encoders, blowers and brakes. The MAX GUARD® Class F insulation system delivers long, dependable motor life under the adverse thermal and dielectric stresses imposed by the high switching frequencies associated with PWM drives. The internally mounted Bearing Current Protection (BCP) system mitigates inverter sourced bearing currents, increasing bearing life. With a 100% cast iron frame and brackets, this motor series delivers long term reliability in harsh environments. It can be C-Face foot mounted (Up to 100HP) and is precision balanced to reduce vibration and increase motor life. Available configurations include Explosion proof, Drip proof-Force ventilated, Brake motor, and Constant horsepower. The Blue Max line represents the industries' broadest product offering that is designed for air moving, compressor and pumping applications with a wide voltage/frequency range that meets global requirements. Performance Matched to all leading brands of PWM drives to provide years of trouble-free operation, the Blue Max line offers a direct drop-in replacement with Severe and Hazardous Duty® ratings.
The Blue Max 2000 motor is designed for inverter or vector applications where up to a 2000:1 constant torque speed range is required. Typical applications include material handling, machine tools, conveyors, crane and hoist, metal processing, test stands, pumps compressors, textile processing, and other industrial machinery installed in dusty or dirty environments where cast iron construction is required.

Blue Max Variants

ModelHPRPMVoltsEnclosureFrameF.L. Amps
143THTN802811800230/460TENV143TC3.0/1.5
145THTN80371 1/21800230/460TENV145TC4.6/2.3
145THTN802921800230/460TENV145TC6.0/3.0
182THTS802831800230/460TENV182TC8.0/4.0
184THTS802851800230/460TENV184TC13.4/6.7
213THFS80287 1/21800230/460TEFC213TC19.4/9.7
213THTS80387 1/21800230/460TENV213TC21.0/10.5
215THFS8029101800230/460TEFC215TC25.4/12.7
215THTS8038101800230/460TENV215TC26.0/13.0
254THFNA8038151800230/460TEFC254TC37.0/18.5
254THTNA8058151800230/460TENV254TC40.4/20.2
284THFPA8086151200230/460TEBC284TC40.0/20.0
256THFNA8038201800230/460TEFC256TC52.0/26.0
256THTNA8038201800230/460TENV256TC52.0/26.0
286THFPA8086201200230/460TEBC286TC52.4/26.2
284THFPA8028251800230/460TEFC284T63.0/31.5
284THFPA8038251800230/460TEBC284TC63.0/31.5
324THFPA8086251200230/460TEBC324TC67.0/33.5
286THFNA8028301800230/460TEFC286T77.0/38.5
286THFPA8038301800230/460TEBC286TC74.0/37.0
326THFPA8086301200230/460TEBC326TC80.4/40.2
324THFPA8028401800230/460TEFC324T 100.0/50.0
324THFPA8038401800230/460TEBC324TC100.0/50.0
364THFS8391401200230/460TEBC364TC107.0/53.5
326THFS8028501800230/460TEFC326T 121.0/60.5
326THFPA8038501800230/460TEBC326TC120.0/60.0
365THFS8380501200230/460TEBC365TC130.0/65.0
364THFS8036601800230/460TEFC364T 147.0/73.5
364THFS8046601800230/460TEBC364TC147.0/73.5
404THFS8092601200230/460TEBC404TC142.0/71.0
365THFS8036751800230/460TEFC365T 184.0/92.0
365THFS8046751800230/460TEBC365TC180.0/90.0
405THFS8378751200230/460TEBC405TC180.0/90.0
405THFS80361001800230/460TEFC405T 230/115
405THFS80461001800230/460TEBC405TC230/115
444THFN83841001200230/460TEBC444TC250/125
444THFN80361251800460TEFC444T 143
444THFN80461251800460TEBC444T138
445THFN80361501800460TEFC445T170
445THFN80461501800460TEBC445T170
445THFN80402001800460TEFC445T230
445THFN80502001800460TEBC445T230
449THFS80362501800460TEFC449T280
449THFS80462501800460TEBC449T295
449THFS80373001800460TEFC449T330
449THFS80473001800460TEBC449T327
449THFS80483501800460TEBC449T385


   Unlimited lead length at 460 VAC

   Power Rating: 1HP to 350HP

   2000:1 constant torque speed range

   MAX GUARD insulation system

   Three year warranty


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