The GBX1200040554F is a straight-tooth planetary gearbox in a 120 mm diameter housing, delivering a 4:1 reduction ratio. Continuous output torque is 155 N.m at 100 rpm and 30 °C; maximum intermittent torque reaches 248 N.m under the same conditions. That 155 N.m continuous figure is the one to size against — the motor-side input torque multiplied by the ratio and efficiency determines whether the gearbox lives its full 30,000-hour service life. Efficiency is listed at 94 %, which is typical for a single-stage planetary of this ratio. The 6 % loss goes into heat inside the housing — the black anodized aluminium body dissipates it, but in a confined panel or enclosed drive train, the ambient temperature must stay within the -25 to 90 °C operating range.
Shaft loading limits and backlash — the mechanical interface constraints
Maximum radial force on the output shaft is 1500 N at 100 rpm for the full 30,000-hour life, applied at mid-distance from the shaft face. Axial force is capped at 2100 N under the same duty. Exceed these and the bearing life drops faster than the torque derating curve suggests — the 2800 N / 10000-hour axial rating is the short-term ceiling. Torsional backlash is 8 arc-minutes maximum, with a torsional rigidity of 12 N.m/arcmin. For a positioning axis that needs repeatable direction reversal, that 8 arc-min of lost motion at the output means the encoder or load-side feedback must account for the windup before the gear train engages. The shaft output seal is rated IP54 — splash protection from the shaft side, but the gearbox body itself is not sealed for washdown. The housing is black anodized aluminium; the shaft is C45 steel. Lubrication is factory-filled for life, so no maintenance oil changes are needed.
Obsolete — sourcing through independent channels
Schneider Electric lists this gearbox as obsolete. 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 has been announced by Schneider.