The form factor behind the GBX1200400702D
The GBX1200400702D is a planetary gearbox in the Schneider Electric GBX family, built around a 120 mm external-diameter black anodized aluminium housing with straight-cut gears, giving a 40:1 reduction in a single stage. The output shaft is C 45 steel, the body is rated for mounting in any position, and the shaft seal carries IP54 protection at the output — meaning splash and dust ingress from above are tolerated but it is not a washdown-class reducer.
What the torque and rigidity numbers mean for the load
Continuous output torque is rated 230 N.m with a maximum output torque of 368 N.m, so the gearbox is sized for steady industrial duty with significant short-term overload headroom — typically the envelope used to size peak accelerations on conveyor, mixer, or indexing drives. Torsional rigidity is 13 N.m/arcmin and maximum torsional backlash is 12 arc.min, so the GBX1200400702D sits in the mid-precision bracket of the GBX family — fine for general automation positioning, not the backlash figure you would specify for a high-accuracy tool-changing axis. Maximum radial force Fr is 1500 N at 100 rpm over the 30000 h life at 30 °C (rising to 2000 N if you accept a 10000 h service life), and maximum axial force Fa is 2100 N over the same envelope (2800 N at the shorter life), with the force values applied at mid-distance from the output shaft. Belt and pinion drives have to be sized so the overhung load stays inside that envelope or the bearing life collapses.
Efficiency, noise and the moment-of-inertia footprint
Single-stage efficiency is 94 %, which is the expected planetary level — useful when you are computing motor torque back from the load and want to know how much the gearbox itself consumes versus the bearings and seals. Noise level is 65 dB at 1 m on no-load, so at the driven end of a machine in a populated cell it is a quiet reducer rather than a loud one — for a clean-room-adjacent line or an operator workstation this matters more than the headline torque. Moment of inertia is 1.3 g.cm², a low figure that lets the upstream servo accelerate without the gearbox itself dominating the inertia match — the servo sizing gain on the GBX1200400702D is that the 40:1 reduction reflects that back to the motor as a square of the ratio.
Service life, lubrication and operating envelope
The unit is lubricated for life and rated for 30000 h at 100 rpm at 30 °C, which is the duty point Schneider quotes for the standard bearing-life calculation — above 100 rpm or at higher ambient temperatures the life figure drops on the published curves. Ambient temperature for operation is -25 to 90 °C, so the gearbox tolerates a cold start on a freezer-line conveyor or warm ambient on a motor-room deck, but it is not a sealed outdoor unit — the IP54 shaft seal limits it to sheltered duty.
Where this sits on the storeroom shelf
Lifecycle status is recorded as current on the active GBX family, so the GBX1200400702D is a fast-mover part to keep on the shelf rather than a phase-out — for a food-and-beverage MRO catalog, holding one or two as critical spares covers the indexing-drive swap-out without waiting on a build cycle.