20:1 reduction, 260 N.m continuous — what the ratings mean
The GBX1200200553F is a planetary gearbox with straight teeth, 120 mm external diameter, delivering a 20:1 reduction ratio. Its continuous output torque is 260 N.m (2301.2 lbf.in) at 100 rpm and 30 °C — that is the steady-state limit for sizing; the maximum output torque of 416 N.m (3681.9 lbf.in) at the same speed is for peak loads only, not continuous duty. Efficiency is 94 %, which is respectable for a single-stage straight-tooth planetary — expect some power loss to heat, but it stays within the lubricated-for-life sealed housing. The 30000-hour service life at rated load (100 rpm, 30 °C) sets the replacement interval for a BOM line; if the application runs at higher ambient or speed, derate accordingly. Torsional backlash is 12 arcmin maximum — that is moderate precision, suitable for indexing and positioning where repeatability matters but not for ultra-precision servo axes. The torsional rigidity of 13 N.m/arcmin gives a feel for how much wind-up you get under load.
Sourcing and lifecycle — obsolete, quoted to order
Schneider Electric lists the GBX1200200553F as obsolete. No official successor is published. The part is sourced through independent distribution and surplus channels — quantities are confirmed at RFQ, and the price depends on lot size and condition (new-in-box vs pulls). Because the gearbox is lubricated for life and sealed, there is no field-maintenance schedule. The IP54 shaft output means it is protected against dust and splashing water but not washdown — keep it out of direct hose-down zones. For a BOM freeze or a line-down replacement, confirm axial and radial load limits against your actual load profile before committing.
Mounting and integration notes
120 mm diameter black anodized aluminium housing, shaft material C45 steel. The straight-tooth planetary design is inherently compact for the torque class — plan the mounting flange and output coupling to handle the 1500 N radial force (at 100 rpm, mid-shaft, 30000 h life) and 2100 N axial force under the same conditions. Noise level is 65 dB at 1 m, no-load — quiet enough for indoor machinery near operators. Operating ambient range is -25 to 90 °C, so it works in unheated spaces or near hot motors as long as the gearbox itself stays within the rated temperature window.