Planetary gearbox, 5:1 reduction, 195 N.m continuous
The GBX1200050554F is a Schneider Electric planetary gearbox with straight teeth, 120 mm external diameter, and a 5:1 reduction ratio — a common pick for speed reduction on servo or stepper motor outputs in indexing, positioning, or conveyor drives. Continuous output torque is 195 N.m at 100 rpm and 30 °C, with a maximum of 312 N.m under the same conditions — the continuous figure is the one to size against for duty cycles above 60%. Efficiency is listed at 94 %, which is typical for a single-stage planetary — the 6 % loss is mostly gear mesh friction and bearing drag, not heat buildup in the housing.
Load ratings and service life at 100 rpm
Rated service life is 30,000 hours at 100 rpm and 30 °C — if the output speed is higher or the ambient temperature exceeds 30 °C, the actual life will be shorter; the axial and radial force ratings also assume 100 rpm and 30 °C for the 30,000-hour target. Maximum axial force Fa is 2100 N (30,000-hour life) or 2800 N (10,000-hour life); maximum radial force Fr is 1500 N (30,000-hour) or 2000 N (10,000-hour), applied at mid-distance from the output shaft. Torsional rigidity is 12 N.m/arcmin — this tells you how much the output shaft twists under load; for a positioning application, the total backlash (8 arcmin max) plus the wind-up under torque determines the final positioning error.
Mechanical build and environmental ratings
Housing is black anodized aluminium; shaft material is C 45 steel. The gearbox is lubricated for life — no maintenance oil changes needed. Shaft output is rated IP54 — protected against dust ingress and splashing water, but not submersion. Ambient operating range is -25 to 90 °C. Noise level is 65 dB at 1 m, no-load — about the level of a quiet office printer; under load it will be higher, but the straight-tooth design is inherently noisier than helical.