The GBX0400080704F is a 40 mm-diameter planetary gearbox with straight teeth and an 8:1 reduction ratio. It delivers 6 N.m continuous output torque at 100 rpm, with a peak of 10 N.m at the same speed. The 94 % efficiency figure means about 6 % of input power is lost to friction and windage — typical for a single-stage planetary of this size, and the loss shows up as heat in the gearbox housing. The 30 arc-min maximum torsional backlash is the total angular play between input and output when the direction reverses. For a positioning axis that indexes in one direction only, this backlash is taken up on the first move and doesn't repeat; for a bidirectional servo axis that reverses under load, the 30 arc-min contributes to the positioning deadband and may need compensation in the controller.
Service life, forces, and the temperature envelope
Rated service life is 30,000 hours at 100 rpm and 30 °C ambient — about 3.4 years of continuous running at that speed. The axial (Fa) and radial (Fr) force limits are 200 N for a 10,000-hour life, dropping to 160 N if you need the full 30,000-hour rating. Both forces are specified with the load applied at mid-distance from the output shaft, so an overhung load farther out reduces the allowable force proportionally. The operating ambient range is -25 to 90 °C, which covers most indoor industrial environments and some outdoor cabinets. The shaft output seal is rated IP54 — splash-proof but not submersible, so the gearbox should be mounted with the output shaft pointing down or horizontally, never up into a dripping source. The housing is black anodized aluminium (40 mm diameter) and the shaft is C45 carbon steel. The gearbox is lubricated for life, so no maintenance schedule for oil changes — just verify the seal integrity if the unit has been sitting on a shelf for years.
Obsolete — sourcing runway and what to expect
Schneider Electric has marked the GBX0400080704F as obsolete. This means the factory no longer builds it, and the only supply channel is independent surplus or last-time-buy inventory already in the distribution chain. For a motion axis that depends on this exact 40 mm frame size and 8:1 ratio, the replacement path is a parametric search for a planetary gearbox with the same mounting dimensions, output torque (6 N.m continuous), and backlash class (30 arc-min or better). The 94 % efficiency and 30,000-hour life are competitive benchmarks — any replacement should match or exceed those to avoid a thermal or durability mismatch in the application. We source this part through our independent distribution network. If you have a production run that needs this gearbox, the lead time to locate a lot is part of the RFQ conversation — we don't hold stock on an obsolete line, but we can usually find clean, traceable units.