What the 4:1 reduction and 155 N.m continuous torque mean for your machine
The GBX1200040702F: This is a straight-tooth planetary gearbox from the GBX series, 120 mm outer diameter, with a 4:1 reduction ratio. The continuous output torque is 155 N.m at 100 rpm and 30 °C — that's the number to size against your application's duty cycle, not the peak 248 N.m maximum. The 94 % efficiency means about 6 % of input power turns into heat inside the housing. For a 155 N.m output at 100 rpm, that's roughly 100 W of thermal loss — the black anodised aluminium housing sinks that without a fan, but the ambient limit is 90 °C. Backlash is 8 arcmin maximum — acceptable for general positioning and conveyor indexing, but not for a servo-grade rotary table where you'd want 3 arcmin or less. The torsional rigidity is 12 N.m/arcmin, so the windup under load is predictable.
Obsolete — what that means for procurement
Schneider Electric lists this gearbox as obsolete. Stock is sourced through independent surplus channels. Quantities are confirmed at RFQ — no blanket availability claim. The lubricated-for-life design means shelf-stored units don't degrade the way a wet-seal gearbox might.
Mounting and integration constraints
The output shaft is C45 steel, IP54 rated at the shaft exit. Maximum radial force on the output shaft is 1500 N at mid-span for the 30000-hour life target. Axial load capacity is 2100 N under the same duty. Exceed those and the bearing life drops fast — the 10000-hour figures (2000 N radial, 2800 N axial) show the trade-off.