Planetary gearbox, 4:1 — the torque and life numbers that matter
The GBX1200040551F is a straight-tooth planetary gearbox from Schneider Electric's GBX family, sized for a 120 mm housing diameter and a 4:1 reduction ratio. Continuous output torque is 155 N.m at 100 rpm and 30 °C; the maximum short-term torque hits 248 N.m under the same conditions — that's the overload ceiling before you risk gear damage. Rated service life is 30,000 hours at rated load and speed, and the unit ships lubricated for life — no oil changes, no maintenance schedule on the gearbox itself.
Backlash, forces, and mounting fit
Maximum torsional backlash is 8 arc.min — typical for a precision straight-tooth planetary stage; if your application needs less than 5 arc.min, this gearbox won't hold it without a preload or a different tooth profile. Maximum axial force on the output shaft is 2100 N at 100 rpm for the full 30,000-hour life, or 2800 N if you accept a shorter 10,000-hour window. Radial force limits are 1500 N and 2000 N respectively, measured at mid-span on the shaft. Shaft output carries an IP54 rating — fine for a dry indoor environment but not for washdown or direct spray. The housing is black anodized aluminium; the shaft is C45 steel.
Sourcing reality — obsolete, but available
Schneider Electric lists this part as obsolete. The GBX1200040551F is available through independent surplus and broker channels. Quantities are lot-specific — confirmed at RFQ against your BOM line.