What this GBX box is sized to do
The Schneider Electric GBX1200151081D is a 120 mm-diameter planetary gearbox in the GBX family with a 15:1 reduction ratio, sized for servo-class motion where a compact inline speed reducer sits between the motor and the driven load. Continuous output torque is rated 230 N.m, with a maximum output torque of 368 N.m available for transient accelerations and shock loads — the gap between continuous and peak is what lets the gearbox absorb start-stop cycles without prematurely wearing the planet stage. The reduction is achieved with straight-tooth gearing in a black anodized aluminium housing, with a C 45 steel output shaft designed to mate into the driven element via a standard coupling or pinion.
Precision and torsional behaviour
Maximum torsional backlash is 12 arc.min and torsional rigidity is 13 N.m/arcmin, which together define the positioning error and shaft twist under load — figures that read modest on paper but are the deciding limit for any application that needs to return to a repeatable index on each cycle. Moment of inertia at the input is 2.53 g.cm², which keeps the gearbox from dragging on the servo loop's acceleration budget — a low input inertia is what lets the drive command fast torque reversals without the reducer absorbing most of the current.
Service life and shaft loading
Service life is quoted at 30000 h at 100 rpm and 30 °C, with maximum radial force of 1500 N and maximum axial force of 2100 N under the same conditions; derating to 10000 h raises those figures to 2000 N radial and 2800 N axial, which is the lever to use when the application runs hot, faster, or carries a heavy overhung load. Ambient operating range is -25 to 90 °C and the unit is lubricated for life, so the only scheduled maintenance is keeping the seal and the shaft area clean — the bearings carry no routine re-grease step.
Sealing, efficiency, and noise
The shaft output carries an IP54 rating, which keeps the seal protected against splash and dust ingress but does not make it washdown-rated — any food-grade, outdoor, or high-moisture installation has to plan an additional guard or relocate the reducer out of the splash zone. Efficiency is 94% and noise level is 65 dB measured at 1 m on the no-load bench — the efficiency figure is the conduction-and-windage loss floor and the noise figure is what the surrounding enclosure has to absorb.
Lifecycle and what replaces it on the BOM
Product status is recorded as obsolete on the manufacturer record, so the line is no longer in regular factory production and any replenishment flows through independent distribution rather than the OEM sales channel. No official second-source or pin-compatible successor is carried in this record; if a substitution is required for an active build, it has to be re-engineered against a different reduction stage or frame size from the GBX family, which is a design change rather than a drop-in. For installed assets already fitted with this reducer, the practical posture is to keep one critical spare on the shelf rather than rely on a same-day factory shipment that no longer exists — gearbox failures on legacy servo lines tend to take the line down for the same ten-thousand-hour window the gearbox was rated for.