The GBX0400200703F is a 40 mm diameter planetary gearbox with a 20:1 reduction ratio — the input speed is divided by 20, and the output torque is multiplied by roughly the same factor, less the 94 % efficiency loss. That efficiency figure means 6 % of the input power is dissipated as heat inside the housing, which is black anodized aluminium and relies on natural convection for cooling. Maximum output torque is 32 N.m at 100 rpm and 30 °C ambient, but the continuous duty rating is 20 N.m at the same conditions — the difference is the thermal limit under sustained load. Service life is specified at 30000 hours at continuous torque, which is roughly 3.4 years of 24/7 operation before the lubricant degrades or the bearings wear past acceptable backlash. Torsional backlash is 28 arcmin maximum — that is about half a degree of rotational slop when the load reverses direction. For positioning applications that need better than this, the straight-tooth design (no helical angle) is the limiting factor; a helical planetary would cut backlash by roughly half but adds axial thrust the output bearing must handle.
Integration constraints
The output shaft is C45 steel and the shaft output seal is rated IP54 — that means dust-protected and splash-resistant, not washdown. The housing is 40 mm diameter, so it fits a standard 40 mm clamp mount or flange pattern common in small servo-gearbox applications. Axial force on the output shaft is limited to 200 N for 10000-hour life, dropping to 160 N for the full 30000-hour service life at 100 rpm. Radial force (applied at mid-shaft) follows the same derating curve. These limits govern the overhung load from a belt pulley or pinion gear — exceed them and the output bearing fails before the gear teeth. The gearbox is lubricated for life — there is no fill plug or drain port, so the lubricant condition cannot be checked or changed in the field.
Sourcing reality — obsolete part
Schneider Electric lists the GBX0400200703F as obsolete. Quantities are lot-specific and confirmed at RFQ time; the lubricated-for-life design means shelf-aged units are still serviceable as long as the shaft seals are intact and the lubricant has not separated. No pin-compatible drop-in replacement exists from Schneider Electric — any substitution will require verifying the input flange pattern, output shaft diameter, and overall length against the mating motor and load coupling.