Planetary gearbox, 80 mm frame, 12:1 reduction
The GBX0800120701F is a straight-tooth planetary gearbox in the 80 mm diameter frame, with a 12:1 reduction ratio. It delivers 120 N.m continuous output torque at 100 rpm and 30 °C, with a maximum intermittent torque of 192 N.m under the same conditions.
Torque, backlash, and service life — what the ratings mean
Continuous output torque is 120 N.m (1062.09 lbf.in) at 100 rpm and 30 °C; the maximum output torque of 192 N.m (1699.3 lbf.in) is the peak the gearbox can handle without damage, not the continuous rating. Torsional rigidity is 6.5 N.m/arcmin — this tells you how much the output shaft twists under load, which matters for positioning accuracy in indexing or servo applications. Maximum torsional backlash is 14 arc.min. This is the angular play between input and output when the direction reverses — for a 12:1 reduction, 14 arc.min at the output corresponds to roughly 1.17 arc.min at the input, but the spec is at the output shaft. If your application requires less than 14 arc.min of lost motion, this gearbox won't hold the position loop. Rated service life is 30,000 hours at 100 rpm and 30 °C. The maximum axial (Fa) and radial (Fr) forces are derated over life: at 30,000 hours, Fa is 900 N and Fr is 650 N (force applied mid-shaft); at 10,000 hours, Fa rises to 1200 N and Fr to 950 N. If your load has high overhung or thrust loads, the 30,000-hour limit is the conservative design target. Efficiency is 94 % — typical for a single-stage planetary with straight teeth and grease lubrication. The 6 % loss is mostly gear mesh friction and bearing drag; it appears as heat, so the gearbox housing (black anodised aluminium) acts as the heat sink. No external cooling is needed at the rated duty cycle.
Obsolete — sourcing the GBX0800120701F today
Schneider Electric lists the GBX0800120701F as obsolete. The gearbox is sourced through independent distribution channels — quantities are lot-specific and confirmed at RFQ. For a critical spare on legacy equipment, it is worth holding one in the cabinet before the line needs it. The gearbox is lubricated for life — no oil changes or regreasing intervals. Shaft output sealing is IP54, meaning it is protected against dust ingress and splashing water, but not submersion. The C45 steel shaft and black anodised aluminium housing are standard for indoor industrial environments; outdoor or washdown duty would need additional shaft sealing and a corrosion-resistant coating.