What this 12:1 planetary gearbox delivers
The Schneider Electric GBX0400120704F is a 40 mm-diameter planetary gearbox with a 12:1 reduction ratio, delivering 20 N.m continuous output torque at 100 rpm and 30°C ambient. Maximum output torque reaches 32 N.m (283.2 lbf.in) at the same speed and temperature, with a service life rated at 30,000 hours under those conditions. The straight-tooth planetary design achieves 94% efficiency — the losses are mostly gear mesh friction and bearing drag, so the input power required is roughly 1.06× the output power delivered.
Mechanical constraints that matter for integration
Maximum torsional backlash is 28 arcmin — this is the angular play between input and output when torque direction reverses; for positioning applications that need tighter repeatability, a lower-backlash series is needed. Rated radial force on the output shaft is 200 N at mid-span for a 10,000-hour life, dropping to 160 N for the full 30,000-hour rating; axial force limits are identical. Overhung loads from pulleys or sprockets must stay within these bounds. The shaft output seal carries IP54 protection — fine for dry indoor environments, but washdown or outdoor use needs a secondary cover over the output end.
Lifecycle and sourcing — obsolete, quoted to order
For a drop-in replacement, the buyer must cross-reference the 40 mm frame size, 12:1 ratio, and 20 N.m continuous torque against other planetary gearbox series. Available through independent surplus and broker channels; quantities are confirmed at RFQ. Sourced to order — no stock-holding claim is made.