Planetary gearbox — 120 mm frame, 12:1 reduction
The GBX1200121001F is a straight-tooth planetary gearbox in a 120 mm diameter housing, delivering a 12:1 reduction ratio. It is rated for 260 N.m continuous output torque at 100 rpm and 30 °C, with a maximum intermittent torque of 416 N.m under the same conditions. Service life is specified at 30,000 hours at rated load and speed — the gearbox is lubricated for life, so no field maintenance is required on the oil charge.
The continuous torque figure (260 N.m) is the design limit for steady-state operation at 100 rpm and 30 °C ambient. The maximum torque (416 N.m) covers peak loads during acceleration or momentary overloads — but the gearbox must return to continuous duty within the thermal cycle. Both ratings are stated at the same speed and temperature, so no derating interpolation is needed for that operating point. Maximum torsional backlash is 12 arc-minutes. This is the angular play between input and output when the direction reverses — relevant for positioning accuracy in indexing or servo applications where lost motion must be budgeted into the controller's compensation. Torsional rigidity is 13 N.m/arcmin — this is the stiffness of the gear train under load. For a given torque, the wind-up angle is torque divided by rigidity; at 260 N.m continuous, the elastic deflection is about 20 arc-minutes on top of the backlash.
Shaft loads and environmental limits
Maximum axial force (Fa) on the output shaft is 2100 N for the full 30,000-hour service life, or 2800 N if the application accepts a reduced 10,000-hour life. Radial force (Fr) limits are 1500 N and 2000 N respectively, with the force applied at the midpoint of the output shaft extension. The shaft output carries an IP54 ingress protection rating — sealed against dust and splashing water, but not submersion. The housing is black anodized aluminium; the shaft is C45 steel. Ambient operation spans -25 °C to 90 °C. Efficiency is listed at 94 %, meaning 6 % of the input power is lost as heat within the gearbox. Noise level at 1 m under no-load is 65 dB — a moderate level that typically does not require enclosure acoustic treatment but should be considered if the gearbox is near operator stations.
Obsolete — sourcing through independent channels
Schneider Electric has marked the GBX1200121001F as obsolete. No official successor or pin-compatible replacement is recorded from the manufacturer. The gearbox is available through independent surplus and broker channels; quantities are lot-specific and confirmed at the time of RFQ. For a BOM that requires this exact ratio and frame size, the obsolete status means the procurement path is a one-time buy of available inventory or a search for new-old-stock. If the application can tolerate a different ratio or frame, a current-production planetary gearbox from the same family would require a full mechanical revalidation of the mounting interface and shaft loads.