3:1 planetary — 115 N.m continuous at 100 rpm
The GBX1200030552F is a 120 mm-diameter planetary gearbox from Schneider Electric's GBX series, delivering a 3:1 reduction ratio with 94% efficiency. Continuous output torque is 115 N.m at 100 rpm, with a maximum of 184 N.m at the same speed — the limiting factor is the thermal capacity of the lubricated-for-life grease pack, not the gear teeth. Straight-tooth gearing keeps cost down and efficiency up, but generates more noise than helical — the 65 dB at 1 m no-load figure is the baseline; expect a few dB more under full torque. The 8 arc-min maximum torsional backlash is typical for a precision planetary stage at this price point, adequate for indexing and positioning applications that don't need zero-backlash.
Load capacity and bearing life at 100 rpm
Rated service life is 30,000 hours at 100 rpm and 30°C ambient — the grease life, not the bearings, sets this ceiling. At that speed and temperature, maximum axial force (Fa) is 2100 N and maximum radial force (Fr) is 1500 N applied at mid-span on the output shaft. For shorter duty cycles, the numbers step up: 2800 N axial and 2000 N radial for a 10,000-hour life at the same speed. Torsional rigidity is 12 N.m/arcmin — meaning a 12 N.m load twists the output shaft by one arc-minute. This stiffness matters when the downstream mechanism has position-loop gain; a compliant gearbox introduces phase lag that the servo or stepper has to overcome. The shaft output seal is rated IP54, so the gearbox handles dust and splash but not washdown. The black anodized aluminium housing with C45 steel shaft is standard for indoor industrial environments; the -25 to 90°C operating range covers most factory floor conditions.
Obsolete — sourced through independent channels
Schneider Electric lists the GBX1200030552F as obsolete. The GBX series has been superseded by newer planetary families with different mounting interfaces and backlash specs — a direct drop-in replacement is unlikely without a frame-size check. Available through independent surplus and broker channels.