Torque delivery at the output flange
The GBX1200150553F is a 120 mm-diameter planetary gearbox with a 15:1 reduction ratio, delivering a continuous output torque of 230 N.m at 100 rpm and a maximum intermittent torque of 368 N.m under the same conditions. That 60% torque headroom above the continuous rating means it can handle transient overloads during acceleration or stall recovery without immediately tripping the upstream drive — provided the duty cycle stays within the 30000-hour service life envelope at 30 °C ambient. Efficiency sits at 94 %, which is typical for a single-stage planetary with straight-cut teeth at this ratio. The remaining 6 % is gear mesh and bearing loss, dissipated through the black anodised aluminium housing; at 230 N.m and 100 rpm the thermal loss is about 240 W, well within the housing's natural convection capacity at 30 °C ambient.
Backlash and stiffness for positioning
Maximum torsional backlash is 12 arcmin — that is the total lost motion across the gear train measured at the output shaft. For a 15:1 reducer, 12 arcmin at the output corresponds to roughly 0.8 arcmin at the input, which is acceptable for indexing or positioning applications that do not require zero-backlash servo-grade accuracy. The torsional rigidity of 13 N.m/arcmin means the output shaft deflects about 0.08° under full continuous torque — a stiffness figure that matters when the load has significant inertia and the drive is accelerating or decelerating through the gear train. The straight-tooth planetary design inherently produces more noise than helical gearing — the datasheet lists 65 dB at 1 m, no-load, which is audible but within typical industrial enclosure limits. In a quiet environment like a cleanroom or packaging line, the gearbox may need acoustic cladding or a sound-dampening enclosure to keep the floor noise below 70 dB.
Sourcing reality — obsolete, but available
Schneider Electric lists the GBX1200150553F as obsolete. The part is sourced through independent surplus and broker channels; quantities are lot-specific and confirmed at RFQ. No pin-compatible or footprint-equivalent replacement exists from Schneider — any substitution requires a mechanical re-design of the mounting interface and possibly the input/output shaft connections. For a BOM that already carries this gearbox, the 30000-hour service life at rated load means a unit installed today still has years of usable life remaining, but spares procurement should be treated as a last-time-buy decision.
Mechanical interface and environmental limits
The output shaft is C45 carbon steel, and the housing is black anodised aluminium. The shaft output seal carries IP54 protection — splash-resistant, not submersible, and not rated for washdown. In a dusty or wet environment, the gearbox should be mounted with the output shaft pointing downward or shielded from direct spray. Ambient operating range is -25 to 90 °C. The unit is lubricated for life — no oil changes or regreasing intervals. Maximum axial force on the output shaft is 2100 N for the full 30000-hour life, or 2800 N if the application accepts a shorter 10000-hour life. Maximum radial force is 1500 N at mid-span for 30000 hours, or 2000 N for 10000 hours. These are the limits that govern bearing life; exceeding them accelerates wear and reduces the service life below the datasheet figure.