3:1 planetary gearbox — 115 N.m continuous at 100 rpm
The GBX1200030553F is a Schneider Electric planetary gearbox with a 3:1 reduction ratio, delivering 115 N.m continuous output torque at 100 rpm and 30 °C ambient. Efficiency is listed at 94 %, which is typical for a single-stage planetary with straight teeth. The 6 % loss shows up as heat in the housing — the black anodized aluminium body (120 mm diameter) acts as the heat sink, so mounting orientation and airflow matter if the duty cycle is high.
Load limits and service life
Rated service life is 30,000 hours at 100 rpm and 30 °C — that is the L10 bearing life under the rated radial and axial loads. The maximum radial force Fr is 1500 N applied at mid-span on the output shaft for the full 30,000-hour life; it can handle 2000 N if you accept a 10,000-hour life. Maximum axial force Fa follows the same pattern: 2100 N for 30,000 hours, 2800 N for 10,000 hours. Torsional rigidity is 12 N.m/arcmin — this tells you how many arc-minutes the output shaft twists per N.m of applied torque. Combined with the maximum torsional backlash of 8 arc.min, it defines the positioning repeatability for a pick-and-place or indexing axis. Straight teeth inherently have more backlash than helical, so if zero-backlash is required this is not the gearbox for that application.
Lifecycle reality — obsolete, sourced through surplus
Schneider Electric lists the GBX1200030553F as obsolete. This part is available through independent surplus and broker channels — quantities are lot-specific and confirmed at RFQ. The 30,000-hour service life means a unit sourced today could still cover a decade of single-shift operation, but once the surplus stock is gone there is no factory replenishment. The gearbox is lubricated for life — no oil-change schedule, which simplifies maintenance but also means the lubricant condition is the wear limit. Shaft output IP54 keeps dust and splash out of the output seal, but the motor-side input is not separately rated — the motor itself provides the primary seal at that interface.