Planetary gearbox for servo positioning — 12:1 ratio, 120 N.m continuous
The Schneider Electric GBX0800120842D is a straight-tooth planetary gearbox in the GBX series, sized for servo motor output shafts. Its 80 mm housing diameter and 12:1 reduction ratio transform a motor's speed and torque for indexing, positioning, or conveyor drive applications where compact inline mounting is needed. Rated for 120 N.m continuous output torque and 192 N.m maximum, this gearbox handles sustained loads at the lower end of the torque curve and peaks during acceleration or intermittent overloads. The 94 % efficiency means about 6 % of the input power is lost as heat — a factor in thermal budgeting for the motor and gearbox pair. Torsional backlash is 17 arc.min maximum — acceptable for general positioning where the load does not reverse frequently under high precision. For tighter repeatability, a lower-backlash planetary (typically 8-10 arc.min) would be needed.
Load ratings and service life — what the numbers mean for your axis
The service life is stated as 30000 h at 100 rpm output speed and 30 °C ambient. Run it faster or hotter and that figure drops — the life rating is a reference point for sizing, not a guarantee. The gearbox is lubricated for life, so no oil changes or regreasing intervals to track. Maximum axial force on the output shaft is 1200 N at 100 rpm for a 10000-hour life target, derating to 900 N for the full 30000-hour window. Radial force limits are 950 N (10000 h) and 650 N (30000 h), measured at mid-span on the output shaft. These are the bearing load ceilings — overhung loads from belt drives or pinions need to be checked against these curves. At 90 °C the lubricant viscosity drops and bearing life shortens — the 30000-hour figure no longer applies. Mounting position is unrestricted, which simplifies integration into vertical or inverted axis configurations. Noise output is 60 dB at 1 m under no-load conditions — audible but not intrusive in a machine enclosure. Under load the noise level will rise with torque and speed, but the straight-tooth geometry is inherently noisier than helical; if acoustic specs are tight, a helical planetary would be quieter.
Obsolete — sourcing through independent channels
Schneider Electric has classified the GBX0800120842D as obsolete. No official successor is listed in the product documentation. This means the part is no longer manufactured and is not available through the standard OEM distribution channel. Availability is limited to surplus or broker inventory. We source this gearbox through independent distribution channels — quantities are confirmed at RFQ, and each unit is verified against the original spec before shipment. Lead time and pricing are quoted per request against your BOM line. For new designs or replacement of an existing GBX0800120842D, a drop-in replacement from the same series does not exist. A functional replacement would need to match the 80 mm flange, 12:1 ratio, 120 N.m continuous torque, and shaft dimensions — likely a different manufacturer's planetary gearbox with similar envelope.