What this planetary gearbox delivers
The GBX0400250571G is a 40 mm-diameter planetary gearbox from Schneider Electric's GBX series, with straight-cut teeth and a 25:1 reduction ratio. Continuous output torque is 18 N.m at 100 rpm at 30 °C, with a maximum intermittent torque of 29 N.m at the same speed and temperature — the higher figure is for acceleration peaks, not sustained running. Efficiency sits at 94 %, which is typical for a single-stage planetary set with straight teeth; the noise level is 55 dB at 1 m under no-load, quiet enough for a benchtop or lab environment.
Lifecycle reality — obsolete, sourced to order
Sourcing runs through independent surplus and new-old-stock channels; quantities are lot-specific and confirmed at RFQ.
Mechanical limits that govern the fit
Service life is rated 30,000 hours at 100 rpm and 30 °C — if your duty cycle runs the gearbox hotter or faster, derate the life accordingly. The operating ambient range is -25 to 90 °C. Maximum axial force on the output shaft is 200 N at 100 rpm for a 10,000-hour life, dropping to 160 N for the full 30,000-hour rating. Radial force follows the same pattern: 200 N at mid-shaft for 10,000 hours, 160 N for 30,000 hours. Torsional rigidity is 1.1 N.m/arcmin — this tells you how much the output shaft twists under load. For positioning applications, the 28 arcmin maximum backlash means this is not a zero-backlash gearbox; it's built for speed reduction, not precision indexing. Shaft output seal is IP54 — splash-resistant but not submersible. The housing is black anodized aluminium, the shaft is C45 steel. Lubricated for life, so no maintenance oil changes.