3:1 planetary reduction for servo and positioning axes
The GBX1200030701F is a 120 mm-diameter planetary gearbox from Schneider Electric's GBX series, delivering a 3:1 reduction ratio with a maximum torsional backlash of 8 arc.min — tight enough for indexing tables and pick-and-place axes where repeatable positioning matters more than absolute accuracy. Continuous output torque is 115 N.m at 100 rpm, with a maximum intermittent torque of 184 N.m — sized for servo motor outputs in the 1–2 kW range on conveyor drives or rotary indexing stations.
Efficiency, noise, and mechanical limits
Rated 94 % efficiency means roughly 6 % of input power is lost as heat in the gear mesh — acceptable for continuous duty at 115 N.m, but the housing (black anodized aluminium) relies on natural convection; forced cooling is not required at rated load. Noise level is 65 dB at 1 m, no-load — typical for straight-tooth planetary stages; if your application is in a quiet assembly area (below 60 dB ambient), you will hear the gear whine under load. Service life is 30,000 hours at 100 rpm and 30 °C — lubricated for life, so no maintenance interval for oil changes. The shaft output carries an IP54 rating, meaning dust ingress is limited and splashing water from any direction is tolerated, but not washdown. Maximum axial force on the output shaft is 2100 N for the full 30,000-hour life, or 2800 N if you accept a 10,000-hour service life. Radial force limits are 1500 N and 2000 N respectively, applied at mid-shaft — overhung loads from belt drives or pinions must be checked against these figures.
Obsolete — last-time-buy sourcing
Schneider Electric has marked the GBX1200030701F as obsolete. No official successor is listed — the GBX series has been superseded by newer planetary families with different mounting dimensions and backlash specs. This gearbox is available through independent surplus channels. Quantities are lot-specific and confirmed at RFQ. If you have a BOM line that calls out this exact order code, buying ahead while stock exists covers you for years — once the surplus dries up, a redesign to a current-series gearbox is the only path.
Mounting and integration notes
External diameter is 120 mm (4.7 in) — fits standard NEMA 56C or IEC B5 flanges with an adapter plate. Shaft material is C45 carbon steel; the keyway and centre hole dimensions are not listed here, so verify the output shaft geometry against your coupling before committing. Torsional rigidity is 12 N.m/arcmin — this is the stiffness of the gear train under load. For a servo axis with a 115 N.m peak torque, expect roughly 9.6 arcmin of wind-up at the output; the positioning controller must account for this in the servo tuning. Ambient operating range is -25 to 90 °C — the lubricant is rated for that span, but at the low end the grease thickens and efficiency drops slightly; at the high end, the 30,000-hour life assumes 30 °C ambient, so derate service life above that temperature.