Planetary gearbox, 80 mm, 20:1 — 120 N.m continuous
The GBX0800200554F is a straight-tooth planetary gearbox from Schneider Electric's GBX series, 80 mm outer diameter, with a 20:1 reduction ratio. Continuous output torque is 120 N.m at 100 rpm and 30 °C; peak torque reaches 192 N.m under the same conditions. Rated efficiency is 94 %, and the unit is lubricated for life — no maintenance schedule for oil changes. Service life is 30,000 hours at rated load and speed.
Load ratings and fit — what the numbers mean for a build
The 120 N.m continuous torque is the design ceiling for steady-state servo or stepper-driven indexing. The 192 N.m peak covers acceleration and emergency stops, but the 30,000-hour service life is calculated at the continuous figure — sustained peak operation shortens it. Maximum axial force Fa is 1200 N at 100 rpm for 10,000 hours, dropping to 900 N for the full 30,000-hour life. Radial force Fr at mid-shaft is 950 N (10,000 h) or 650 N (30,000 h). These are the limits for belt-drive or overhung loads on the output shaft. Torsional backlash is 14 arc-min maximum — a standard-grade figure for positioning where absolute accuracy is not critical. Torsional rigidity is 6.5 N.m/arcmin, meaning the shaft twists about 18 arc-min under full continuous torque. Shaft output seal is IP54, so the gearbox handles dust and splashing water but not washdown. Ambient range is -25 to 90 °C. Housing is black anodized aluminium; shaft is C45 steel.
Obsolete — sourcing through independent channels
Schneider Electric lists the GBX0800200554F as obsolete. No direct successor order code is published. The unit is sourced through independent distribution and surplus channels — quantities are confirmed per RFQ, and pricing is quoted against the BOM line. Noise level is 60 dB at 1 m, no-load — typical for a straight-tooth planetary of this size. The 94 % efficiency means about 7.2 W of heat loss at 120 N.m and 100 rpm, which the anodized aluminium housing dissipates without a fan in most panel-mount positions.