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Schneider Electric ATV21WD18N4 — AC Drive (VFD) 480V

Schneider Electric ATV21WD18N4 AC Drive (VFD) 480V, 18.5 kW

MPNATV21WD18N4
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Schneider Electric Altivar 21 ATV21WD18N4 AC drive (VFD), 18.5 kW, 380-480 V three-phase, 27.8 A line current at 480 V, 12.4 x 12.2 x 26.2 in (315 x 310 x 665 mm), CE marked.

$1,242.07Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

ATV21WD18N4 — Identification
ParameterValue
Product typeVariable speed drive
Product range / familyAltivar 21
ATV21WD18N4 — Power & Output
ParameterValue
Motor power (kW)18.5 kW
Max. transient current40.7 A 60 s
Apparent power28.2 kVA 380 V
ATV21WD18N4 — Input / Supply
ParameterValue
Input line current27.8 A 480 V 34.9 A 380 V
ATV21WD18N4 — Control & Performance
ParameterValue
Output frequency range0.5...200 Hz
Asynchronous motor control modesConstant voltage/frequency ratio Current flux vector control (FVC) without speed feedback Energy saving ratio Constant voltage/frequency ratio with automatic IR compensation Quadratic voltage/frequency ratio
ATV21WD18N4 — Protection & EMC
ParameterValue
Integrated EMC filter classClass A EMC filter integrated
EMC immunity tests1.2/50 µs - 8/20 µs surge immunity test level 3 conforming to IEC 61000-4-5 Conducted radio-frequency immunity test level 3 conforming to IEC 61000-4-6 Electrical fast transient/burst immunity test level 4 conforming to IEC 61000-4-4 Electrostatic discharge immunity test level 3 conforming to IEC 61000-4-2 Radiated radio-frequency electromagnetic field immunity test level 3 conforming to IEC 61000-4-3 Voltage dips and interruptions immunity test conforming to IEC 61000-4-11
ATV21WD18N4 — Mechanical & Cooling
ParameterValue
IP degree of protectionIP54 EN 60530 IP54 EN 61800-5-2 IP54 IEC 60529 IP54 IEC 61800-5-1
Acoustic noise level60.2 dB 86/188/EEC
Assembly / installation styleWith heat sink
ATV21WD18N4 — Environmental
ParameterValue
Operating ambient temperature14...104 °F (-10...40 °C) (without derating) 104...122 °F (40...50 °C) (with derating factor)
Operating altitude3280.84...9842.52 ft (1000...3000 m) limited to 2000 m for the Corner Grounded distribution network
Relative humidity5...95 % without condensation IEC 60068-2-3 5...95 % without dripping water IEC 60068-2-3
Storage / transport temperature-13...158 °F (-25...70 °C)
Pollution degree2 IEC 61800-5-1
Vibration resistance1 gn (f= 13...200 Hz) conforming to EN/IEC 60068-2-8 1.5 mm (f= 3...13 Hz) conforming to EN/IEC 60068-2-6
ATV21WD18N4 — Approvals
ParameterValue
Certifications & markingCE
Standards complianceEN 61800-3 environments 2 category C3 EN 61800-3 environments 2 category C2 IEC 61800-5-1 IEC 61800-3 environments 2 category C1 EN 61800-5-1 IEC 61800-3 environments 2 category C3 EN 55011 class A group 1 EN 61800-3 environments 1 category C1 IEC 61800-3 environments 1 category C3 IEC 61800-3 environments 1 category C1 EN 61800-3 environments 1 category C3 IEC 61800-3 category C3 IEC 61800-3 environments 2 category C2 EN 61800-3 IEC 61800-3 category C2 IEC 61800-3 EN 61800-3 environments 1 category C2 IEC 61800-3 environments 1 category C2 EN 61800-3 environments 2 category C1 EN 61800-3 category C2 EN 61800-3 category C3
ATV21WD18N4 — Communication
ParameterValue
Communication protocolsModbus

Product details

18.5 kW at 380-480 V — HVAC drive for asynchronous motors

The ATV21WD18N4 is a Schneider Electric Altivar 21 variable-frequency drive rated for 18.5 kW motor power on a 380-480 V three-phase supply, drawing 27.8 A line current at 480 V or 34.9 A at 380 V. This is the HVAC-dedicated branch of the Altivar family — the PI regulator, BACnet/LonWorks/Metasy N2 option cards, and the 1:10 speed range all point to pump, fan, and compressor duty in building services.

Panel fit and feeder sizing

Footprint is 12.4 in deep by 12.2 in wide by 26.2 in tall (315 x 310 x 665 mm) — a substantial enclosure that needs a backplate cutout and clearance for the heat sink fins. The line current at 480 V (27.8 A) sets the branch-circuit conductor and overcurrent device rating; at 380 V the draw climbs to 34.9 A, so the feeder must be sized for the higher figure if the site runs at the lower voltage.

Switching frequency and derating — motor noise vs thermal budget

Default carrier frequency is 6 kHz, adjustable up to 16 kHz — raising it quiets the motor whine but requires derating above 8 kHz. The drive's transient overtorque capability is 120 % of nominal motor torque for 60 seconds, which covers fan inertia starts and pump breakaway torque. Speed accuracy is ±10 % of nominal slip across the 0.2 Tn to Tn range — open-loop vector control is adequate for HVAC loads that don't need closed-loop encoder feedback.

Frequently asked questions

What compliance documentation does Schneider Electric provide for ATV21WD18N4?

The drive carries CE marking and complies with EN 61800-3 (environments 1 and 2, categories C1 through C3), IEC 61800-5-1, and EN 55011 Class A Group 1. The integrated Class A EMC filter covers conducted emissions for industrial installations. Schneider Electric provides a EU Declaration of Conformity and the product manual (available as a PDF) covering installation, commissioning, and EMC guidelines.

MPN
ATV21WD18N4