Planetary gearbox with 8:1 reduction — 80 mm frame
The GBX0800080841D is a straight-tooth planetary gearbox from Schneider Electric's GBX series, 80 mm external diameter, delivering an 8:1 reduction ratio. It is rated for 50 N.m continuous output torque and 80 N.m maximum, making it a fit for servo or stepper motor applications requiring compact speed reduction in a precision motion axis.
Continuous output torque is 50 N.m; the maximum transient torque reaches 80 N.m — the gearbox can handle short-duration peak loads (acceleration, emergency stop) without damage, but the duty cycle must stay within the continuous rating for thermal stability. Efficiency is listed at 96 %, typical for a single-stage planetary with straight teeth — the 4 % loss is mostly gear mesh friction and bearing drag, not heat buildup in the housing. Noise level is 60 dB at 1 m under no-load conditions — this is the acoustic floor; under load the gear mesh whine rises but stays within the 60–65 dB range for a straight-tooth planetary at moderate speed. The housing is black anodized aluminium, shaft material is C 45 steel, and the unit is lubricated for life — no maintenance oil changes required over the service life. Service life is rated 30,000 hours at 100 rpm and 30 °C ambient. The maximum axial force Fa is 1200 N at 100 rpm for 10,000 hours, derating to 900 N for the full 30,000-hour window. Maximum radial force Fr is 950 N at 100 rpm for 10,000 hours, dropping to 650 N for 30,000 hours — the radial load limit is the more restrictive constraint for belt-drive or overhung-load applications. Torsional backlash is rated at 12 arc.min maximum — this is a standard-precision planetary, not a zero-backlash unit. For positioning axes where reversal error matters (ball-screw drives, indexing tables), the 12 arc.min figure must be budgeted into the overall system accuracy. Torsional rigidity is 6 N.m/arcmin — the gearbox wind-up under load is predictable and repeatable.
Obsolete — sourcing through independent channels
Schneider Electric lists the GBX0800080841D as obsolete. The part is available through independent surplus and broker channels — quantities are confirmed at RFQ, and pricing is quoted per the lot available.
Mounting and integration notes
Mounting position is any orientation — the lubricated-for-life grease stays in place regardless of shaft axis. The shaft output carries an IP54 rating, meaning the output seal resists dust ingress and splashing water; the gearbox body itself is not sealed to IP65, so it should not be washdown-exposed.