12:1 planetary gearbox — 20 N.m continuous, 32 N.m peak
The GBX0400121004F is a 40 mm diameter planetary gearbox from Schneider Electric's GBX series, with straight-cut teeth and a 12:1 reduction ratio. It delivers 20 N.m continuous output torque at 100 rpm, with a maximum peak of 32 N.m at the same speed — enough margin for short overloads during acceleration or shock loads.
Torque, backlash, and service life at 100 rpm
Rated for 30,000 hours service life at 100 rpm and 30 °C ambient, the gearbox is lubricated for life — no oil changes, no breather vent to maintain. Torsional backlash is 28 arc.min maximum, which matters for positioning accuracy in indexing or start-stop applications; if your motion profile requires tighter repeatability, this figure sets the floor. Maximum radial force at mid-shaft is 160 N for the full 30,000-hour life, or 200 N if you accept a 10,000-hour service interval. Axial force limits follow the same derating curve: 160 N for 30,000 hours, 200 N for 10,000 hours. Overhang loads from pulleys or pinions must stay within these bounds to avoid bearing wear that shortens life below the rating.
Efficiency, noise, and environmental sealing
At 94 % efficiency, the gearbox loses about 6 % of input power as heat — roughly 1.3 W at the continuous torque rating, which the anodised aluminium housing dissipates without a fan. Noise measures 55 dB at 1 m, no-load, which is quiet enough for lab or office-adjacent equipment without an acoustic enclosure. Shaft output sealing is IP54, meaning dust-protected and splash-resistant at the output shaft — suitable for dry indoor environments but not washdown. The housing is black anodised aluminium, shaft is C45 carbon steel. Ambient operating range is -25 to 90 °C, covering most industrial enclosures and outdoor cabinets in temperate climates.
Obsolete — sourcing through independent channels
Schneider Electric lists the GBX0400121004F as obsolete. No official successor or cross-reference is published. Quantities are confirmed at RFQ; no minimum order is assumed.