25:1 planetary reduction for servo and stepper applications
The GBX1200251002F is a 120 mm-frame planetary gearbox from Schneider Electric's GBX series, delivering a 25:1 reduction ratio with straight-cut teeth for precision motion control applications. Rated for 230 N.m continuous output torque at 100 rpm and 30 °C, with a maximum intermittent torque of 368 N.m — the 25:1 ratio steps down motor speed while multiplying torque for indexing tables, conveyor drives, and pick-and-place axes. Efficiency sits at 94 %, meaning about 6 % of input power is lost to gear mesh friction and bearing drag — typical for a single-stage planetary with straight teeth at this ratio.
Torque, backlash, and bearing load limits
Maximum torsional backlash is 12 arc-minutes — this is the angular play between input and output when reversing direction, a key parameter for positioning accuracy in bidirectional servo applications. Torsional rigidity is 13 N.m/arcmin, indicating how much the gear train winds up under load; stiffer gearboxes maintain better positional repeatability under varying torque. Maximum axial force (Fa) on the output shaft is 2100 N for a 30000-hour service life at 100 rpm and 30 °C, or 2800 N for a 10000-hour life — axial loads above these figures shorten bearing life or cause shaft deflection. Maximum radial force (Fr) applied at mid-distance from the output shaft is 1500 N for 30000 hours at 100 rpm and 30 °C, or 2000 N for 10000 hours — radial overhang loads from belt drives or overhung pinions must stay within this envelope. Service life is rated at 30000 hours at 100 rpm and 30 °C ambient, with the gearbox lubricated for life — no maintenance oil changes required over the rated lifespan.
Environmental sealing and integration
Shaft output is protected to IP54, meaning the output seal resists dust ingress and splashing water — adequate for most industrial environments but not for washdown or submerged service. Housing is black anodized aluminium, 120 mm external diameter, with C 45 steel output shaft — the anodized surface resists corrosion in dry indoor environments but may not hold up to caustic washdown chemicals. Noise level is 65 dB at 1 m under no-load conditions — audible but within typical machine shop background levels; straight-cut teeth are inherently noisier than helical but offer higher efficiency and lower cost.
Obsolete — sourcing through independent channels
No official successor or direct replacement part number is recorded from Schneider for this specific frame size and ratio combination. Available through independent surplus and broker channels; quantities are lot-specific and confirmed at RFQ. No stock-holding claim — sourced per request against the BOM line.