What Is SCADA? Supervisory Control Without Replacing the PLC
SCADA sits above PLCs and RTUs: it acquires field data, alarms operators, and issues supervisory commands across plants and remote assets—without replacing local deterministic control.

The ATV21HD18N4 is a Variable Frequency Drive (VFD) from the Altivar 21 series, engineered for precise speed and torque management of three-phase asynchronous motors. Designed for a power rating of 18.5 kW (25 HP) at an operating voltage of 480V, this drive provides high-performance control for industrial motor applications. The ATV21HD18N4 includes an integrated EMC filter (Class A) to minimize conducted emissions and is housed in an IP20-rated enclosure, making it suitable for mounting within clean, protected electrical control panels.
| Feature | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Range | Altivar |
| Subrange | 21 |
| Model | ATV21HD18N4 |
| Power Rating | 18.5 kW (25 HP) |
| Supply Voltage | 480 V |
| Protection Rating | IP20 |
| EMC Filter | Class A |
| Commodity Code | 85044095 |
| Product Phase | Phase-Out |
| Weight | 11.55 kg |
| Dimensions (H x W x D) | 33.00 x 24.50 x 19.00 cm |
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| Color pattern |
Greyish White
|
| Country of origin |
France
|