20:1 planetary gearbox — 120 mm frame, 260 N.m continuous
The GBX1200201004F is a Schneider Electric planetary gearbox with a 20:1 reduction ratio, built into a 4.7 in (120 mm) diameter housing. It delivers 2301.2 lbf.in (260 N.m) continuous output torque at 100 rpm and 86 °F (30 °C), with a maximum peak of 3681.9 lbf.in (416 N.m) under the same conditions. Rated efficiency sits at 94 %, and the straight-tooth design keeps noise to 65 dB at 1 m under no-load — a reasonable figure for a servo-grade planetary stage in a machine-tool or packaging-line axis.
Lifecycle reality — obsolete, sourced through surplus channels
Schneider Electric lists the GBX1200201004F as obsolete. This gearbox is available through independent surplus and broker channels.
Continuous torque of 260 N.m at 100 rpm sets the thermal limit for sustained duty. The maximum torsional backlash is 12 arc.min — this is a standard-precision planetary, not a zero-backlash unit, so factor it into positioning error budgets on reversing loads. Maximum axial force (Fa) is 2100 N at 100 rpm for the 30000-hour service life, or 2800 N if you accept a 10000-hour life. Radial force (Fr) at mid-shaft is 1500 N for 30000 hours, 2000 N for 10000 hours. These are the load limits on the output bearing — overshoot them and the service-life guarantee drops. Torsional rigidity is 13 N.m/arcmin — that stiffness figure governs windup under load. The shaft output carries an IP54 ingress rating, so it handles dust and splashing water but not washdown.
Materials and installation notes
Housing is black anodized aluminium; the output shaft is C45 steel. The gearbox is lubricated for life — no oil-change interval to schedule. Operating ambient range is -13 to 194 °F (-25 to 90 °C). Single unit per package. The 120 mm outer diameter and straight-tooth planetary stage mean it mates with standard servo-motor flanges in the same frame class — confirm the motor pilot and keyway dimensions before specifying.