750 W on a single-phase 220 V shelf
The Delta ASDA-A2-0721-M is a 750 W AC servo drive in the ASDA-A2 family, sized for small-format motion axes where cabinet space and clean single-phase feed matter more than three-phase headroom. It draws 220 VAC on the input side and delivers 5.1 A on the output, which is the figure you match against the servo motor's rated current when sizing the loop. Chassis-mount format and a 0°C ~ 55°C operating envelope put it firmly in the cabinet-internal category — not a sealed field unit. Plan clearances around the heat sink fins; the drive is convection-cooled and the upper end of that thermal window only holds with the cabinet airflow sized for it.
Where it sits in a retrofit panel
On a legacy line being kept alive with modern guts, the question is always whether the new drive meets the old footprint where it is. The ASDA-A2-0721-M drops into a chassis-mount cut-out typical of the A2 series — the 220 VAC single-phase input means it can be fed from an existing 1-phase cubicle without pulling a new three-phase feeder, which is often the difference between a one-day retrofit and a wiring re-think.
Sourcing posture and lifecycle read
For an MRO spares holding or a BOM freeze, the safe read is: stock the drive against a known consumption rate, but do not assume an immediate factory ship; the listed posture is shipping inside 1 to 10 working days against the order quantity, which is confirmed at RFQ. If a true second source is required at the BOM gate, that has to be qualified separately rather than inferred from family neighbours.