12:1 planetary — 44 N.m continuous at 94 % efficiency
The GBX0600120554F is a 60 mm-diameter planetary gearbox with a 12:1 reduction ratio, rated for 44 N.m continuous output torque at 100 rpm and 30 °C ambient. The 94 % efficiency figure means only 6 % of the input power is lost as heat through the straight-tooth mesh — a realistic working efficiency for a single-stage planetary at this ratio. Maximum output torque hits 70 N.m at the same speed and temperature, but this is a peak/emergency limit — the continuous rating is the one to size against for a duty cycle. Service life is specified at 30,000 hours at 100 rpm and 30 °C, which is the B10 life for the bearings and gear mesh under the continuous torque load.
Backlash and stiffness — 20 arc.min, 2.5 N.m/arcmin
Maximum torsional backlash is 20 arc.min — this is a standard-precision planetary, not a zero-backlash unit for servo positioning. For indexing or conveyor drives where reversal accuracy is not critical, this backlash level is acceptable. The torsional rigidity of 2.5 N.m/arcmin gives a stiffness figure: under the continuous 44 N.m load, the gear train winds up about 17.6 arc.min before the output moves. Straight teeth (not helical) produce the 58 dB noise level at 1 m no-load — audible but not objectionable in a machine room. Helical gears would be quieter but cost more and add axial thrust the bearings must handle.
Sourcing reality — obsolete, sourced through independent channels
This GBX0600120554F is listed as obsolete by Schneider Electric. The part is available through independent surplus and broker channels — quantities are lot-specific and confirmed at RFQ. No pin-compatible or dimensionally identical direct replacement exists from Schneider; a functional replacement would require checking the mounting flange, shaft diameter, and keyway dimensions against a current-series planetary.
Mounting and environmental limits
The 60 mm housing diameter and black anodized aluminium body make this a compact, corrosion-resistant unit for panel or machine mounting. The output shaft is C45 steel — standard keyed shaft material. Ambient operating range is -25 to 90 °C, covering most indoor industrial enclosures without derating. Shaft output IP54 means the output seal is protected against splashing water and dust ingress — fine for a dry indoor environment, but not rated for washdown or outdoor exposure. The gearbox is lubricated for life, so no maintenance oil changes are required over the 30,000-hour service life.
Load limits — axial and radial forces
Maximum axial force on the output shaft is 450 N for the full 30,000-hour life at 100 rpm and 30 °C, rising to 600 N if the life target is reduced to 10,000 hours. Maximum radial force applied at mid-span of the output shaft is 340 N for 30,000-hour life, or 500 N for 10,000-hour life. These are the limits for overhung loads like belt pulleys or chain sprockets mounted directly on the output shaft.