Part identity and gear geometry
The GBX1200400703D is a planetary gearbox from the Schneider Electric GBX family with a 120 mm external diameter and a 40:1 reduction ratio, built around straight-cut gears in a black anodized aluminium housing with a C 45 steel output shaft.
Torque envelope and rated service life
Continuous output torque is listed at 230 N.m with a maximum output torque of 368 N.m, sized against a 30,000 hour service life at 100 rpm and 30 °C ambient — meaning the gearbox is rated to carry its continuous load over that duty point without re-lubrication. Maximum radial load Fr is 1,500 N at 100 rpm over 30,000 h and rises to 2,000 N at 100 rpm over 10,000 h; maximum axial load Fa is 2,100 N at 100 rpm over 30,000 h and 2,800 N over 10,000 h — the higher figures apply only at the shorter life target.
Precision, stiffness, and efficiency
Maximum torsional backlash is 12 arc.min and torsional rigidity is 13 N.m/arcmin, with a moment of inertia of 1.3 g·cm² — positioning this unit on the standard-precision side of the GBX line, suited to motion control where repeatable indexing matters but ultra-low backlash is not required. Efficiency is 94 % at the gear stage and noise level is 65 dB at 1 m on no-load — consistent with a straight-tooth planetary stage; helical or low-noise variants would be quieter at the cost of higher cost and a different ratio ladder.
Lifecycle status and supply posture
The GBX1200400703D has been cross-referenced in the OEM catalogue as a GBX-series planetary gearbox with a 40:1 ratio and 120 mm frame; buyers fitting a replacement should confirm the output shaft diameter, pilot flange, and motor adapter plate against the mating servo before committing to a substitute, since a same-family alternative is not guaranteed to be a drop-in mechanical replacement.