Planetary gearbox, 25:1 reduction, 110 N.m continuous
The GBX0800250551F is a straight-tooth planetary gearbox from Schneider Electric's GBX series, sized for servo and stepper motor applications that need a compact 80 mm diameter package. The 25:1 reduction ratio delivers 110 N.m continuous output torque at 100 rpm (30 °C), with a maximum intermittent torque of 176 N.m for short-duration overloads. Torsional rigidity is 6.5 N.m/arcmin, and maximum backlash is 14 arcmin — figures that matter for positioning accuracy in indexing or pick-and-place axes. The shaft output carries an IP54 seal, adequate for splash exposure in a clean or lightly dusty environment.
Load ratings and service life
Rated service life is 30 000 hours at 100 rpm and 30 °C. At that same speed and temperature, the maximum axial force (Fa) is 900 N for 30 000 hours or 1200 N for 10 000 hours; maximum radial force (Fr) applied at mid-distance on the output shaft is 650 N for 30 000 hours or 950 N for 10 000 hours. These are the numbers to check against the actual overhung load and thrust from the driven mechanism. Efficiency is listed at 94 %, and the gearbox is lubricated for life — no maintenance schedule for oil changes. Noise level is 60 dB at 1 m, no-load, which is quiet enough for most production-floor environments without an enclosure. The housing is black anodised aluminium; the output shaft is C45 carbon steel. Ambient operating range is -25 to 90 °C.
Sourcing — obsolete, quoted to order
Schneider Electric lists the GBX0800250551F as obsolete. For a legacy install that needs this exact gearbox — same 80 mm frame, 25:1 ratio, and 14 arcmin backlash — the only channel is independent surplus or broker stock.