20:1 planetary gearbox — 120 N.m continuous, 94 % efficiency
The GBX0800200853G is a straight-tooth planetary gearbox from Schneider Electric's GBX series, with an 80 mm outer diameter and a 20:1 reduction ratio. It delivers 120 N.m continuous output torque at 100 rpm and 30 °C, with a peak of 192 N.m at the same speed and temperature. Efficiency is listed at 94 %, and the gearbox is lubricated for life — no maintenance oil changes over its 30,000-hour service life at 100 rpm and 30 °C.
Load ratings and mechanical limits
Maximum torsional backlash is 14 arc.min, and torsional rigidity is 6.5 N.m/arcmin — the stiffness figure lets you calculate windup under load for positioning applications. Maximum axial force (Fa) is 1200 N at 100 rpm for a 10,000-hour life, derated to 900 N for the full 30,000-hour service life. Maximum radial force (Fr) applied at mid-shaft is 950 N for 10,000 hours or 650 N for 30,000 hours — both at 100 rpm and 30 °C. Moment of inertia is 0.44 g.cm², and the gearbox can be mounted in any position.
Obsolete — sourcing through independent channels
Schneider Electric has marked the GBX0800200853G as obsolete. No official successor or cross-reference is recorded from the manufacturer. For a BOM that requires this exact reduction ratio and torque class, the unit is quoted per the lot available.