Frame, reduction, and what the gearbox actually delivers
The Schneider Electric GBX1200091081D is a planetary gearbox from the GBX series with straight-cut teeth, a 120 mm external diameter, and a 9:1 reduction ratio — the spec brief reads out as 210 N.m continuous output torque against a 336 N.m maximum, with a torsional rigidity of 13 N.m/arcmin and a maximum torsional backlash of 12 arc.min. The 2.62 g.cm² moment of inertia is the figure that matters when this gearbox sits ahead of a servo loop — low enough that commutation bandwidth is not the limit, high enough that belt and coupling stiffness upstream still dominate the resonant picture.
Shaft loading and the 30,000-hour envelope
Maximum radial force Fr is rated at 1500 N at 100 rpm over 30,000 hours at 30 °C, lifting to 2000 N for a 10,000-hour service life; maximum axial force Fa tracks the same duty profile at 2100 N over 30,000 hours and 2800 N over 10,000 hours — the duty class, not the headline force, is the parameter a designer should size against. The unit is lubricated for life, so the 30,000-hour figure at 100 rpm and 30 °C is the published wear budget rather than a maintenance interval — pushing continuous torque toward the 336 N.m peak collapses life proportionally, and ambient operation is rated -25...90 °C.
Efficiency, acoustics, and shaft sealing
Listed efficiency is 94 %, which for a single-stage 9:1 planetary unit is a sensible working point — the loss budget concentrates in the planet bearings and the seal interface, not in the gear mesh itself. Acoustic signature is 65 dB at 1 m under no-load, measured at the gearbox body itself; in a panel build this is the figure to compare against adjacent gear drives when noise is a guard-railing requirement. Shaft output carries an IP54 rating; the gearbox housing itself is not separately sealed beyond the shaft penetration, so a washdown or food-grade deployment needs an external shaft seal or guard at the through-hole.
Lifecycle status and how the part is sourced now
The part is recorded as obsolete on the manufacturer's product status — there is no in-production successor order code on file, so a procurement line against this MPN runs through independent supply rather than the factory channel. Mounting position is unrestricted, the housing is black anodized aluminium, and the shaft material is C 45, so physical integration with a like-for-like replacement is straightforward — the open question for any substitute is whether the reduction ratio, the 120 mm bolt circle, and the 210 N.m continuous rating align with the driven load.