{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ATV21WD18N4","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"ATV21WD18N4","canonicalUrl":"https://aoctrl.com/schneider/ATV21WD18N4","factsUrl":"https://aoctrl.com/api/mcp/products/ATV21WD18N4","rawCanonicalId":null},"summary":{"shortDescription":"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.","salesMarkdown":"## 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.","metaTitle":"Schneider Electric ATV21WD18N4 AC Drive (VFD) 480V, 18.5 kW","metaDescription":"Schneider Electric ATV21WD18N4 Altivar 21 AC drive, 18.5 kW, 380-480 V three-phase, 27.8 A line current at 480 V.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["AC Drive (VFD) 480V"],"specifications":{"Depth":"12.4 in (315 mm)","Phase":"3 phase","Width":"12.2 in (310 mm)","title":"ATV21WD18N4","Height":"26.2 in (665 mm)","Marking":"CE","Category":"22157-ATV212 1 - 25 HP 460 VOLT","Standards":"EN 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","Diagnostic":"1 LED (red) for DC bus energized","EMC filter":"Class A EMC filter integrated","Data format":"8 bits, 1 stop, odd even or no configurable parity","Noise level":"60.2 dB 86/188/EEC","Option card":"Communication card APOGEE FLN Communication card BACnet Communication card LonWorks Communication card METASYS N2","Speed range":"1...10","description":"variable speed drive - ATV21 - 18.5kW 25HP - 480V - EMC filter class A - IP54","Line current":"27.8 A 480 V 34.9 A 380 V","Apparent power":"28.2 kVA 380 V","Assembly style":"With heat sink","Component name":"ATV21","Connector Type":"1 RJ45","Motor power kW":"18.5 kW","Output voltage":"= 1 mOhm 500 V DC for 1 minute","Speed accuracy":"+/- 10 % of nominal slip 0.2 Tn to Tn","Regulation loop":"Adjustable PI regulator","Torque accuracy":"+/- 15 %","lifecycle_stage":"mature","Pollution degree":"2 IEC 61800-5-1","Range of Product":"Altivar 21","Shock resistance":"15 gn 11 ms IEC 60068-2-27","Relative humidity":"5...95 % without condensation IEC 60068-2-3 5...95 % without dripping water IEC 60068-2-3","Transmission Rate":"9600 bps or 19200 bps","Operating altitude":"3280.84...9842.52 ft (1000...3000 m) limited to 2000 m for the Corner Grounded distribution network","Operating position":"Vertical +/- 10 degree","Physical interface":"2-wire RS 485","Transmission frame":"RTU","Dielectric strength":"3535 V DC between earth and power terminals 5092 V DC between control and power terminals","Number of addresses":"1...247","Product destination":"Asynchronous motors","Switching frequency":"6...16 kHz adjustable 8...16 kHz with derating factor","Frequency resolution":"Analog input 0.024/50 Hz Display unit 0.1 Hz","Power Supply Voltage":"380...480 V - 15...10 %","Transient overtorque":"120 % of nominal motor torque +/- 10 % 60 s","Type of polarization":"No impedance","Vibration resistance":"1 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","Communication Service":"Write single register (06) Monitoring inhibitable Write multiple registers (16) 2 words maximum Read device identification (43) Read holding registers (03) 2 words maximum Time out setting from 0.1 to 100 s","Nbr. of units in pkg.":"1","Power Supply Frequency":"50...60 Hz - 5...5 %","IP degree of protection":"IP54 EN 60530 IP54 EN 61800-5-2 IP54 IEC 60529 IP54 IEC 61800-5-1","Motor slip compensation":"Not available in voltage/frequency ratio motor control Automatic whatever the load Adjustable","Maximum transient current":"40.7 A 60 s","Product or Component Type":"Variable speed drive","Maximum Horse Power Rating":"25 hp","Communication Port Protocol":"Modbus","Nominal switching frequency":"8 kHz","Power Supply Voltage Limits":"323...528 V","Environmental characteristic":"Classes 3C1 conforming to IEC 60721-3-3 Classes 3S2 conforming to IEC 60721-3-3","Product Specific Application":"Pumps and fans in HVAC","Speed drive output frequency":"0.5...200 Hz","maximum prospective line Isc":"22 kA","Electromagnetic compatibility":"1.2/50 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","Power Supply Frequency Limits":"47.5...63 Hz","Maximum Continuous Output Current":"37 A 380 V 37 A 460 V","Asynchronous motor control profile":"Constant 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","Ambient Air Temperature for Storage":"-13...158 °F (-25...70 °C)","Ambient air temperature for operation":"14...104 °F (-10...40 °C) (without derating) 104...122 °F (40...50 °C) (with derating factor)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1,242.07","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.se.com/ae/en/product/ATV21WD18N4/variable-speed-drive-atv21-18-5kw-25hp-480v-emc-filter-class-a-ip54/"},"ai":{"faq":[{"question":"What compliance documentation does Schneider Electric provide for ATV21WD18N4?","answer":"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."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/ATV21WD18N4","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/ATV21WD18N4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}