The GBX0800050704F is a 80 mm-diameter planetary gearbox with straight teeth and a 5:1 reduction ratio. Efficiency is 94 %, which means about 6 % of the input power is lost as heat inside the housing. For a 1 kW motor on the input, that's 60 W of heat to manage inside the anodized aluminium body. Maximum torsional backlash is 9 arc.min — this is the lost motion at the output under reversing load. For positioning applications that need better than 0.15° repeatability, a lower-backlash gearbox (or a preloaded stage) would be needed.
Load limits and service life — planning the replacement interval
Rated service life is 30000 hours at 100 rpm and 30 °C ambient. That's about 3.4 years of continuous 24/7 operation — a realistic replacement interval for a machine-tool or packaging-line axis. Maximum axial force on the output shaft is 1200 N for a 10000-hour life, dropping to 900 N if you want the full 30000-hour service life. Radial force limits are 950 N (10000 h) and 650 N (30000 h), both measured at mid-span on the output shaft. The gearbox is lubricated for life — no re-greasing schedule, which simplifies MRO but means the unit is a sealed assembly. If the oil seal at the output shaft fails, the whole gearbox is replaced, not serviced.
Sourcing an obsolete planetary — what to expect
Schneider Electric lists this gearbox as obsolete. Available through independent surplus and broker channels. Quantities are lot-specific — confirmed at RFQ. No form-fit-function direct replacement is documented by Schneider, so a cross-reference to a current-series planetary (same 80 mm flange, 5:1 ratio, 110 N.m continuous) requires checking the mounting interface and shaft dimensions against the BOM.