Ad placeholder (160x600)
Ad placeholder (160x600)

OpenSpecEngineering

Open data for a field built on precision

Motor Starting Current

Locked-rotor (inrush) current estimate, Istart = FLA × multiplier, from NEMA MG-1 (Motors and Generators). Across-the-line-started induction motors typically draw 5–7× their full-load amps (FLA) at the instant of starting; the exact ratio depends on the motor's NEMA design letter, so check the nameplate/locked-rotor code when it's available instead of relying on the default.

Istart (brief spike) running current (FLA)
Starting current spikes well above the steady running (full-load) current.

Solution

History