The GBX1200251003F is a straight-tooth planetary gearbox from Schneider Electric's GBX series, sized for a 120 mm output-stage diameter. Its 25:1 reduction ratio pairs with a continuous output torque of 230 N.m at 100 rpm and 30 °C, and a maximum output torque of 368 N.m under the same conditions. Efficiency is listed at 94 %, which is typical for a single-stage planetary of this ratio. The 65 dB noise level at 1 m, no-load is moderate — audible in a quiet machine shop but not intrusive on a production floor with background ambient noise.
Mechanical limits that set the application envelope
The gearbox carries a 30000-hour service life at 100 rpm and 30 °C, and is lubricated for life — no maintenance oil changes, but the life figure assumes clean, rated load conditions. Maximum axial force on the output shaft is 2100 N for the 30000-hour target, rising to 2800 N if you accept a 10000-hour life. Radial force limits follow the same pattern: 1500 N for 30000 hours, 2000 N for 10000 hours, with the force applied at mid-distance from the output shaft. Torsional rigidity is 13 N.m/arcmin, and maximum torsional backlash is 12 arc.min. For a positioning axis, the 12 arc.min backlash means the output shaft can rotate up to 0.2° before the load engages — acceptable for conveyor drives or indexing tables, but too loose for a servo positioning stage that needs single-arcminute repeatability. The housing is black anodized aluminium, the shaft is C 45 steel, and shaft output protection is IP54 — splash-resistant but not washdown-rated.
Obsolete — sourcing through independent channels
Schneider Electric lists the GBX1200251003F as obsolete. The part is available through independent surplus and broker channels — quantities are lot-specific, and availability is confirmed at RFQ time.