What the VFD055M23A is and what 5.5 kW buys you
The Delta VFD055M23A is a sensorless vector control micro drive from the VFD-M series, sized for a 5.5 kW (7.5 HP) motor at 230 V class — meaning the unit takes 3-phase 200-240 VAC at the input and delivers proportional 3-phase output at up to 25 A continuous, so it sits in the panel between a contactor/breaker upstream and an induction motor downstream on a conveyor, fan, pump, or small machine tool. The 9.5 kVA rated output capacity is the apparent-power ceiling the drive will deliver continuously; the 0.1-400 Hz output frequency range with 1-15 kHz carrier gives the integrator enough headroom for both constant-torque conveyors and variable-torque fan/pump profiles without leaving the standard carrier band.
Input tolerances and what they mean on a weak feeder
The input section accepts 3-phase 200-240 VAC at 50/60 Hz with ±10% voltage tolerance (180-264 VAC) and ±5% frequency tolerance (47-63 Hz), and pulls 28 A rated input current — the wide voltage window lets the drive ride through sagging feeders without tripping on undervoltage, but the 28 A input figure is the sizing number for the upstream breaker and feeder conductor, not the motor FLA.
Why the M21A sibling is not a drop-in
A buyer cross-referencing the single-phase input cousin will find it specified for a different motor power entirely: the VFD055M21A accepts single/3-phase 200-240 VAC and is rated for 3.8 kVA output at 10 A for a 2.2 kW (3.0 HP) motor, while the VFD055M23A is the 3-phase-input variant at 5.5 kW and 25 A — same 7.5 HP label suffix on both codes, but the M21A is not a panel-for-panel substitute for the M23A and rewiring is required.