25:1 planetary stage for servo and stepper applications
The GBX1200251401F is a straight-tooth planetary gearbox from Schneider Electric's GBX series, sized for a 120 mm housing diameter and a 25:1 reduction ratio. This ratio is typical for matching a high-speed motor output — servo or stepper — to a lower-speed, higher-torque load such as a conveyor drive, indexing table, or linear actuator. Continuous output torque is 230 N.m at 100 rpm and 30 °C, with a maximum intermittent torque of 368 N.m under the same conditions. The 30,000-hour service life at rated load gives a replacement interval for production planning — budget the gearbox change at that mark if the duty cycle stays within the continuous torque envelope.
Torque, backlash, and force limits — what they mean for the machine
Efficiency is listed at 94 %, which means 6 % of the input power dissipates as heat inside the housing. For a 230 N.m continuous output at 100 rpm (roughly 2.4 kW input), the thermal loss is about 150 W — the black anodized aluminium housing sinks that without forced cooling in most panel-mount or machine-frame installations. Maximum torsional backlash is 12 arc.min — this is the angular play between input and output when reversing direction. For positioning applications that need better than 0.2° repeatability, a lower-backlash gearbox (3–5 arc.min) would be needed; for simple speed reduction or non-reversing loads, 12 arc.min is acceptable. Axial force on the output shaft is limited to 2100 N for the full 30,000-hour life, or 2800 N if you accept a shorter 10,000-hour service interval. Radial force — the overhung load from a belt or chain sprocket — is 1500 N at mid-span for 30,000 hours, 2000 N for 10,000 hours. These limits govern the bearing selection on the driven component; a belt drive that exceeds 1500 N radial load will shorten gearbox life. Noise level is 65 dB at 1 m under no-load conditions — this is the acoustic signature from the straight-cut gear mesh. In a quiet production environment (below 70 dB background), the gearbox will be audible; helical or ground-gear stages would run quieter but are not offered in this GBX variant.
Obsolete — sourcing through independent channels
Schneider Electric lists the GBX1200251401F as obsolete. The part is available through independent surplus and broker channels — quantities are lot-specific and confirmed at RFQ. The gearbox is lubricated for life and sealed at the shaft output to IP54 — no maintenance grease changes are required, but the seal condition should be inspected if the unit has been in long-term storage. Ambient operating range is -25 to 90 °C, covering most indoor industrial environments.