20:1 planetary, 120 N.m continuous — what it delivers
The GBX0800200704F is a straight-tooth planetary gearbox in the 80 mm frame size, delivering a 20:1 reduction ratio. Continuous output torque is 120 N.m (1062.09 lbf.in) at 100 rpm and 30 °C, with a maximum intermittent torque of 192 N.m (1699.3 lbf.in) at the same speed and temperature — the margin covers acceleration peaks and short overloads without oversizing the next frame up. Torsional backlash is 14 arcmin maximum — this is a standard-precision class, not a zero-backlash stage. For indexing or reversing loads where lost motion matters, budget the full 14 arcmin into the position loop; for constant-rotation conveyor or pump drives it's invisible. Efficiency is 94 %, which is typical for a single-stage planetary with straight teeth and oil lubrication. The 6 % loss shows up as heat in the housing — at 120 N.m and 100 rpm the thermal dissipation is about 80 W, well within the black anodized aluminium housing's natural convection capability at 30 °C ambient.
Lifecycle reality — obsolete, sourced through surplus channels
Schneider Electric lists the GBX0800200704F as obsolete. Availability is through independent surplus and broker inventory. No stock-holding claim is made — each request is quoted against current market supply. For a line-down situation or a BOM freeze that needs this exact ratio and frame, the GBX0800200704F remains findable on the secondary market. The lubricated-for-life design means shelf-stored units retain full service life — 30,000 hours at 100 rpm and 30 °C — as long as the shaft seals are intact.
Load ratings and environmental limits
Maximum radial force at the output shaft is 650 N at 100 rpm for the full 30,000-hour service life, or 950 N if the application accepts a 10,000-hour life. Maximum axial force is 1200 N at 100 rpm for 10,000 hours, derating to 900 N for the 30,000-hour target. Both ratings assume the force is applied at mid-span of the output shaft — overhung loads closer to the bearing face increase capacity slightly. Above 30 °C the lubricant viscosity drops and the housing's heat rejection degrades — derate the continuous torque proportionally above 50 °C ambient. The shaft output seal is rated IP54, meaning dust-protected and splash-resistant but not submersible or high-pressure washdown. Noise level is 60 dB at 1 m, no-load, measured under standard test conditions. This is quiet enough for most indoor machinery enclosures without additional acoustic cladding — comparable to a small hydraulic power unit at idle.