40:1 planetary reduction for servo and stepper applications
The GBX1200400551F is a straight-tooth planetary gearbox from Schneider Electric's GBX series, sized for a 120 mm output stage and a 40:1 reduction ratio. That ratio multiplies motor torque by 40 while dividing output speed by the same factor — a common match for indexing tables, conveyor drives, and positioning axes where the motor runs in its efficient speed range and the gearbox delivers the low-speed torque the load needs. Continuous output torque is rated 230 N.m at 100 rpm and 30 °C, with a maximum intermittent torque of 368 N.m under the same conditions. The 230 N.m continuous figure is the one to size against for duty cycles above 60 % — the 368 N.m peak covers acceleration and emergency stops within the 30,000-hour service life target.
Backlash, stiffness, and load limits for precision axes
Maximum torsional backlash is 12 arcmin, and torsional rigidity is 13 N.m/arcmin. For a positioning axis, 12 arcmin of lost motion at the output means the controller must account for that window in the reversal error compensation — acceptable for general indexing but not for zero-backlash cam-follower or HSC applications. Maximum radial force on the output shaft is 1500 N at 100 rpm for the 30,000-hour life target, rising to 2000 N for a 10,000-hour duty. Maximum axial force is 2100 N at 100 rpm for 30,000 hours, 2800 N for 10,000 hours. These limits apply with the radial force applied at mid-distance from the output shaft — overhung loads closer to the bearing face allow higher forces, but the datasheet values are the safe design-in numbers.
Obsolete — sourcing through independent channels
Schneider Electric has marked the GBX1200400551F as obsolete. No direct successor order code is listed on the manufacturer's lifecycle record. The part is available through independent surplus and broker channels — quantities are lot-specific and confirmed at RFQ. The 94 % efficiency, IP54 shaft output protection, and lubricated-for-life design mean it still fits the original application if a unit can be sourced.