4:1 planetary stage — 30 arcmin backlash and 94 % efficiency
The GBX0400040554F is a 40 mm planetary gearbox with straight-cut teeth and a 4:1 reduction ratio. The 30 arcmin maximum torsional backlash is typical for a commercial-grade precision stage — adequate for indexing and positioning where the load doesn't reverse under torque, but not for a servo axis that needs to hold position through direction changes. Efficiency is listed at 94 %, which means about 6 % of the input power is lost as heat in the gear mesh and bearing drag. For a 15 N.m rated output (the description line), that's roughly 1 N.m of thermal loss — the black anodised aluminium housing sinks that without forced cooling in most duty cycles.
Load ratings and service life at 100 rpm
Rated service life is 30,000 hours at 100 rpm and 86 °F (30 °C). At that same speed, maximum radial force (Fr) is 200 N for a 10,000-hour target, dropping to 160 N if you need the full 30,000-hour life. Axial force (Fa) follows the same derating curve — 200 N for 10,000 hours, 160 N for 30,000 hours. Both assume the radial load is applied at mid-distance from the output shaft. The torsional rigidity figure of 1 N.m/arcmin tells you how much the output shaft twists under load — 1 N.m of torque produces 1 arcmin of windup. That's a relatively soft stage; if your application needs to hold position under varying load, the backlash plus windup will show up as lost motion at the load.
Obsolete — sourcing through independent channels
Schneider Electric has marked the GBX0400040554F as obsolete. The part is available through independent surplus and broker channels — quantities are lot-specific and confirmed at RFQ. No pin-compatible or form-fit-function replacement is documented in the GBX family. The gearbox is lubricated for life and carries an IP54 rating at the shaft output — suitable for indoor environments with dust and light splash, but not washdown.