3/A Series

Combined Planetary/Helical Bevel Gearmotors & Units

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3/A Series

The Bonfiglioli 3/A Series combines the high torque density of planetary gear units with the robustness and high speed of helical bevel products. This configuration provides great power transmission in a very compact space, thanks also to its angular layout. The 3/A Series is available for the lower range of the 300M Series and represents a smart path to medium-duty power transmission for the industrial market. The 3/A Series can be completed by selecting from of a wide range of electric motors entirely manufactured by Bonfiglioli. Asynchronous motors both IEC and compact (BN-BE-BX/M-ME-MX) and reluctance motors (BSR) can be coupled with the 3/A Series. With its broad e-motor portfolio, Bonfiglioli can always provide customers an outstandingly balanced solution in terms of efficiency, dynamics and cost-effectiveness.


Torque range
11,063 … 138,779 in-lb

Torque Range

Torque range
1,250 ... 15,680 Nm

Gear ratios
18.7 ... 731


  • Key benefits
    • Cost effective solution for high torque continuous duty application
    • High shock resistance
    • High transmissible power
    • Compact Layout
    • High mounting flexibility
    • High performance gearmotor solution
  • Main options
    In line/right angle version
    Independent cooling unit
    Patented integrated cooling solution
    Taconite seals
    ATEX certification for explosive environments
  • Certifications
    Certificate of compliance
    Inspection certificate
  • Output
    Foot or flange mounted
    Splined shaft (male, heavy duty, hollow, hollow with axial blockage device)
    Solid keyed shaft (male, heavy duty, stirrer/mixer version)
    Hollow shaft with double key way or shrink disk
  • Motors
    Input with solid shaft
    Input with e-motor coupling:
    • M, ME, MX [compact asynchronous]
    • BN, BE, BX [IEC asynchronous]
    • BSR [IEC reluctance]
    • BS [IEC single phase]
  • Motor options
    Thermistors and thermostat sensors
    Independent forced cooling
    Incremental, sin/cos absolute single/multi-turn encoders
    Anti-condensation heaters


Product Catalogue-300M series Modular planetary gearboxes IE2-IE3

Product Catalogue-300M series Modular planetary gearboxes_NEMA

Product Range I&A

Brochure Heavy Duty

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