Planetary gearbox, 60 mm frame, 25:1 reduction
The Schneider Electric GBX0600250582D is a straight-tooth planetary gearbox in the 60 mm diameter frame, delivering a 25:1 reduction ratio. It is rated for 40 N.m continuous output torque and 70 N.m maximum, with 94 % efficiency — the 6 % loss is mostly gear mesh friction, not bearing drag, so the thermal rise stays low in steady-state positioning duty.
Torque, service life, and the 30 °C baseline
The 40 N.m continuous figure is the thermal limit at 100 rpm input, 30 °C ambient, with a 30,000-hour L10 life target. Push it to 70 N.m peak and the duty cycle must be intermittent — the gear mesh temperature climbs faster than the housing can radiate through the black anodised aluminium. The 30,000-hour rating at 100 rpm is the baseline; at higher input speeds the service life shortens by the inverse cube of the speed ratio, so a 3000 rpm input drops the L10 to roughly 1000 hours at the same torque. Axial and radial load limits are also speed-and-life-dependent: 450 N axial (Fa) and 340 N radial (Fr) at 100 rpm for the full 30,000-hour run, or 600 N / 500 N if you accept a 10,000-hour service life. The radial force is measured at mid-span on the output shaft — an overhung load shortens the bearing life faster than the gear mesh.
Obsolete — sourcing reality for the GBX0600250582D
Schneider Electric lists the GBX0600250582D as obsolete. The part is sourced through independent surplus and broker channels — quantities are lot-specific and confirmed at RFQ. There is no pin-compatible direct replacement from Schneider; a parametric match would need to match the 60 mm flange, 25:1 ratio, and 40 N.m continuous torque in a planetary design with straight teeth.
Mounting and environmental fit
The gearbox mounts in any position — horizontal, vertical shaft-up, or shaft-down — because the lifetime grease lubrication does not pool away from the bearings. The shaft output seal is rated IP54, which handles dust and splashing water but not hose-down; the housing itself is sealed by the anodised layer, not a gasket. Ambient range is -25 to 90 °C, so it lives inside a cabinet or under a machine shroud but not in a freezer or next an oven. The C 45 steel output shaft is standard medium-carbon — hard enough for a keyed coupling but not induction-hardened; repeated press-fit assembly of pulleys or pinions will gall the keyway if not lubricated. Torsional rigidity is 2.5 N.m/arcmin, and the maximum backlash is 25 arc.min — that is a standard-precision grade, not a zero-backlash servo gearhead. For indexing or positioning applications the lost motion at reversal will be about half the backlash spec plus the torsional windup under load.