80:1 planetary gearbox for servo and stepper applications
The GBX1200800552F is a Schneider Electric planetary gearbox with an 80:1 reduction ratio, designed for coaxial mounting on servo or stepper motor outputs where speed reduction and torque multiplication are needed in a compact package. Continuous output torque is 260 N.m at 100 rpm and 30 °C, with a peak rating of 416 N.m at the same speed — the peak figure handles occasional overload events like acceleration or jam recovery, but the continuous figure governs the duty cycle. Efficiency sits at 94 %, which means roughly 6 % of input power dissipates as heat inside the housing — enough to warm the anodized aluminium body under sustained load, but not enough to require forced cooling in most conveyor or indexing applications.
Mechanical limits and service life at 100 rpm
Rated service life is 30,000 hours at 100 rpm and 30 °C — at higher speeds or ambient temperatures the life shortens, so a 200 rpm application running 24/7 would need a replacement interval of roughly 1.7 years instead of the 3.4 years at 100 rpm. Maximum axial force on the output shaft is 2100 N for the 30,000-hour life target, or 2800 N if you accept a 10,000-hour life. Maximum radial force applied at mid-span is 1500 N for 30,000 hours, 2000 N for 10,000 hours. These numbers assume the force is applied at the midpoint of the output shaft — a load closer to the bearing face increases the allowable force. Torsional rigidity is 12 N.m/arcmin, meaning a 12 N.m torque step twists the output shaft by one arcminute. For positioning applications, this stiffness combines with the 14 arcmin maximum backlash to determine the total lost motion under load.
Obsolete — sourcing through independent channels
Available through independent surplus and broker channels. Quantities are lot-specific and confirmed at RFQ. No stock-holding claim — sourced per request against the BOM quantity. For a drop-in replacement, the closest functional match would be another planetary gearbox in the same 120 mm frame size with an 80:1 ratio and 260 N.m continuous torque — but pin-compatibility depends on the input shaft diameter, keyway, and mounting flange pattern, which vary across manufacturers.
Environmental and mounting notes
Shaft output seal is rated IP54 — protected against dust ingress and splashing water from any direction. The housing itself is black anodized aluminium, which resists corrosion in indoor industrial environments but is not rated for outdoor exposure or washdown. The gearbox is lubricated for life from the factory — no oil changes or regreasing intervals to schedule. Noise level at 1 meter under no-load conditions is 65 dB — roughly the sound of a quiet office or a low-speed conveyor. Under load the noise rises with torque and speed, but the straight-tooth design is inherently noisier than helical gearing at equivalent power.