12:1 planetary gearbox — 260 N.m continuous, 416 N.m peak
The GBX1200120702F is a Schneider Electric planetary gearbox with straight teeth, 120 mm external diameter, and a 12:1 reduction ratio. It delivers 260 N.m continuous output torque at 100 rpm and 30 °C, with a maximum intermittent rating of 416 N.m at the same speed and temperature. Rated service life is 30,000 hours at 100 rpm and 30 °C — the gearbox is lubricated for life, so no field re-greasing interval to schedule.
Torque, backlash, and stiffness — what the numbers mean for the application
The 260 N.m continuous rating is the thermal limit at 100 rpm; the 416 N.m maximum output torque covers acceleration peaks and occasional overloads, but sustained operation above the continuous figure shortens the 30,000-hour service life. Maximum torsional backlash is 12 arcmin — this is a standard-precision planetary, not a zero-backlash stage. If the load reverses direction under position control, the 12 arcmin lash shows up as lost motion at the output. Torsional rigidity is 13 N.m/arcmin — the gearbox twists 1 arcmin for every 13 N.m of applied torque. This stiffness figure governs the wind-up under load and matters when the driven mechanism has its own compliance. Efficiency is 94 % at rated load — the 6 % loss shows up as heat in the housing. The black anodised aluminium body dissipates it, but the ambient temperature range of -25 to 90 °C sets the thermal envelope.
Shaft loads and sealing — mounting constraints
Maximum radial force Fr is 1500 N at 100 rpm for the 30,000-hour life, applied at mid-span on the output shaft. For shorter duty (10,000 hours), the limit rises to 2000 N at the same speed and load point. Maximum axial force Fa is 2100 N at 100 rpm for 30,000 hours, or 2800 N for 10,000 hours. Exceeding these loads pushes the output bearing past its L10 life. Shaft output protection is IP54 — the seal keeps out dust and splashing water at the output shaft, but the gearbox body itself is not sealed. Mount it where the housing stays dry. The output shaft is C45 carbon steel, and the housing is black anodised aluminium. The 120 mm body diameter fits standard mounting flanges in the GBX family.
Lifecycle — obsolete, sourced through independent channels
Available through independent surplus and broker channels.