Planetary gearbox, 40 mm frame, 32:1 reduction — now obsolete
The GBX0400320401D is a 40 mm-diameter planetary gearbox from Schneider Electric's GBX series, offering a 32:1 reduction ratio with straight-cut teeth. It delivers 20 N.m continuous output torque and peaks at 32 N.m maximum — the continuous figure is the one to size against for sustained positioning or conveying duty. Schneider Electric lists this part as obsolete. Sourcing runs through independent surplus and broker channels — quantities are lot-specific and confirmed at RFQ. The 30,000-hour service life at 100 rpm and 30 °C means a used unit's remaining life is a function of its prior duty cycle, not the nameplate rating.
Torque, backlash, and thermal limits that govern the fit
Continuous output torque is 20 N.m; the maximum intermittent rating is 32 N.m. The 35 arc.min maximum torsional backlash is typical for a standard-precision planetary — if the application needs under 10 arc.min for indexing or positioning, this gearbox will not hold that tolerance without a preload or a higher-precision series. Efficiency is 94 % — about 6 % of input power dissipates as heat inside the housing. The IP54 rating on the shaft output means it handles dust and splashing water but not pressurized washdown — the seal at the shaft exit is the ingress point to watch. Noise level is 55 dB at 1 m, no-load — quiet enough for indoor conveyor or packaging lines but not silent. The C 45 steel shaft handles 200 N axial force (Fa) and 200 N radial force (Fr) at 100 rpm for 10,000 hours; derate to 160 N for the full 30,000-hour life.
Mounting and integration — any position, lubricated for life
Mounting position is unrestricted — the gearbox runs in any orientation. It is lubricated for life, so no maintenance schedule for grease changes. The 0.017 g.cm² moment of inertia is low enough that the reflected inertia at the motor side is dominated by the motor rotor, not the gearbox — a 32:1 ratio squares the reflected inertia, so the motor sees about 0.017 × 32² = 17.4 g.cm² from the gearbox alone. Torsional rigidity is 1.1 N.m/arcmin — under the 20 N.m continuous load, the gearbox windup is about 18 arcmin, which adds to the 35 arcmin backlash for total positioning uncertainty. The 40 mm external diameter and straight-tooth design mean it mates with standard 40 mm-frame motor flanges; confirm the motor pilot diameter and bolt pattern before committing the BOM line.