The GBX1200150702F is a 120 mm-diameter planetary gearbox with a 15:1 reduction ratio, straight-tooth gearing, and a black anodized aluminium housing. It is part of the Schneider Electric GBX series, designed for servo and motion-control axes where compact radial packaging and moderate backlash are acceptable. The continuous output torque is 230 N.m (2035.7 lbf.in) at 100 rpm and 30 °C — this is the sustained load the gearbox can carry across its 30,000-hour rated service life. The maximum output torque peaks at 368 N.m (3257.07 lbf.in) under the same conditions, which covers intermittent overloads during acceleration or stall. Efficiency is listed at 94 %, meaning 6 % of input power is lost as heat in the gear mesh and bearings. For a motor delivering 2 kW at the input, roughly 120 W must be dissipated through the housing — the anodized aluminium body handles this without forced cooling in most indoor installations.
Backlash, stiffness, and shaft loading — the positioning constraints
Maximum torsional backlash is 12 arc.min — this is the angular play between input and output when the direction reverses. For a positioning axis with a 5 mm-pitch ballscrew, 12 arc.min at the gearbox output translates to roughly 0.017 mm of lost motion at the load, which is acceptable for general indexing but too loose for high-precision contouring. Torsional rigidity is 13 N.m/arcmin — under a 230 N.m continuous load, the gearbox winds up about 17.7 arcmin before the output moves. This windup must be accounted for in the servo tuning if the axis uses a high-gain position loop. The output shaft accepts a maximum radial force of 1500 N and a maximum axial force of 2100 N, both at 100 rpm for the full 30,000-hour life. These limits govern the overhung load from a belt pulley or chain sprocket mounted directly on the shaft — exceeding them shortens bearing life or causes shaft deflection.
Obsolete — sourcing through independent channels
Schneider Electric has classified the GBX1200150702F as obsolete. This gearbox is available through independent surplus and broker channels. No factory warranty applies — condition and traceability are verified per lot before shipment. For a new design, a current-production planetary gearbox with a similar 120 mm frame, 15:1 ratio, and 230 N.m continuous torque should be selected. The GBX series is no longer supported by Schneider Electric for new projects.
Mounting and integration — what fits in the envelope
The gearbox external diameter is 4.7 in (120 mm). The shaft output seal carries an IP54 rating, meaning the output end is protected against dust ingress and splashing water — suitable for washdown-adjacent areas but not for direct hose-down or submersion. The housing is black anodized aluminium; the shaft is C45 medium carbon steel. The gearbox is lubricated for life, so no maintenance oil changes are required over the 30,000-hour service interval. The noise level at 1 m under no-load is 65 dB — comparable to a quiet office environment, which matters for noise-sensitive production areas.