Torque ratings that govern the application
The GBX0800041004F delivers a continuous output torque of 115 N.m (1017.8 lbf.in) at 100 rpm and 30 °C, with a maximum output torque of 184 N.m (1628.5 lbf.in) under the same conditions. The 4:1 reduction ratio means the input speed is four times the output speed, and the input torque is one quarter of the output torque minus the 94 % efficiency loss — so about 30.6 N.m continuous at the input side. The 94 % efficiency figure is the mechanical loss floor through the straight-teeth planetary stage at rated load. That 6 % loss shows up as heat inside the housing — the black anodised aluminium body (80 mm diameter) dissipates it, but a duty cycle above the continuous torque rating will drive the internal temperature above the -25 to 90 °C ambient operating range.
Shaft loading limits and service life
The output shaft (C 45 steel) can take 1200 N axial force (Fa) for 10000 hours at 30 °C and 100 rpm, dropping to 900 N if you want the full 30000-hour service life. Radial force (Fr) applied at mid-shaft is 950 N for 10000 hours or 650 N for 30000 hours. These are hard limits — overshoot them and the bearing life collapses faster than the 30000-hour lubricated-for-life grease charge. The IP54 rating on the shaft output means the seal keeps out dust and splashing water, but it is not submersible or washdown-rated. In a food or wet environment, you would need a secondary cover over the output end.
Backlash and positioning accuracy
Maximum torsional backlash is 9 arcmin — that is the lost motion between input and output when reversing direction. For a 4:1 gearbox this is a standard commercial-grade figure; if your application needs less than 3 arcmin for precision indexing, this straight-teeth planetary will not hold the position repeatability you need. Torsional rigidity is 6 N.m/arcmin — meaning a 6 N.m load twist on the output shaft produces 1 arcmin of elastic deflection on top of the backlash. That stiffness matters when the gearbox is between a servo motor and a load that reverses quickly.
Obsolete — sourcing through independent channels
Schneider Electric has marked the GBX0800041004F as obsolete. The part is available through independent surplus and broker channels — quantities are lot-specific and confirmed at the time of quote. No pin-compatible or form-fit-function replacement is documented by Schneider for this specific frame size and ratio. If you are qualifying a substitute, you will need to compare the 80 mm diameter, 4:1 ratio, 115 N.m continuous torque, and 9 arcmin backlash against other planetary gearboxes in the same envelope.