{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ATV21WD55N4C","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"ATV21WD55N4C","canonicalUrl":"https://aoctrl.com/schneider/ATV21WD55N4C","factsUrl":"https://aoctrl.com/api/mcp/products/ATV21WD55N4C","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Altivar 21 ATV21WD55N4C AC drive, 55 kW, 380-480 V, 3-phase, IP20, integrated Class B EMC filter.","salesMarkdown":"## 55 kW VFD for pump and fan duty The ATV21WD55N4C is a 55 kW Altivar 21 AC drive designed for variable-torque loads like centrifugal pumps and fans. An integrated Class B EMC filter meets EN 55011 Group 1 Class B emissions limits, saving panel space and external filter cost in residential or light-industrial installations. The adjustable switching frequency ranges from 6 to 16 kHz, with a derating factor applied above 8 kHz — useful for quietening motor whine at the cost of reduced continuous output current. ## Transient overtorque and speed regulation Transient overtorque capability of 120 % nominal motor torque for 60 seconds handles short-duration overloads during pump start or fan inertia ramp-up. Speed accuracy is ±10 % of nominal slip from 0.2 Tn to Tn, and an adjustable PI regulator loop allows closed-loop process control without an external controller. The drive supports Modbus RTU over a 2-wire RS-485 physical interface at 9600 or 19200 bps, with up to 247 addresses on the bus. Optional communication cards add BACnet, LonWorks, Metasys N2, or Apogee FLN for building management integration. ## Lifecycle and sourcing — mature, quoted to order No stock-holding claim is made here.","metaTitle":"Schneider Electric ATV21WD55N4C AC Drive, 55 kW, 380-480 V","metaDescription":"Schneider Electric ATV21WD55N4C Altivar 21 AC drive, 55 kW, 380-480 V 3-phase input. Mature lifecycle, quoted to order. Integrated Class B EMC filter.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["AC Drive (VFD) 480V"],"specifications":{"Depth":"14.3 in (364 mm)","Phase":"3 phase","Width":"14.3 in (362 mm)","Height":"39.4 in (1000 mm)","Marking":"CE","Category":"22158-ATV212 30 - 100 HP 460 VOLT","Standards":"EN 61800-3 environments 2 category C2 IEC 61800-3 environments 1 category C1 EN 61800-3 environments 2 category C3 IEC 61800-3 environments 1 category C2 EN 61800-3 category C1 EN 61800-3 environments 1 category C3 EN 61800-3 environments 2 category C1 IEC 61800-3 environments 2 category C3 IEC 61800-3 environments 1 category C3 EN 61800-3 environments 1 category C1 IEC 61800-3 EN 55011 group 1 class B IEC 61800-3 environments 2 category C1 EN 61800-3 environments 1 category C2 IEC 61800-5-1 IEC 61800-3 category C1 EN 61800-3 EN 61800-5-1 IEC 61800-3 environments 2 category C2","Diagnostic":"1 LED (red) for DC bus energized","EMC filter":"Class B EMC filter integrated","Data format":"8 bits, 1 stop, odd even or no configurable parity","Noise level":"63.7 dB 86/188/EEC","Option card":"Communication card APOGEE FLN Communication card BACnet Communication card LonWorks Communication card METASYS N2","Speed range":"1...10","Line current":"89 A 480 V 102.7 A 380 V","Apparent power":"76.3 kVA 380 V","Assembly style":"With heat sink","Component name":"ATV21","Connector Type":"1 RJ45","Motor power kW":"55 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":"3 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 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) Time out setting from 0.1 to 100 s Read holding registers (03) 2 words maximum Monitoring inhibitable Write multiple registers (16) 2 words maximum Read device identification (43)","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":"Adjustable Not available in voltage/frequency ratio motor control Automatic whatever the load","Maximum transient current":"127.6 A 60 s","Product or Component Type":"Variable speed drive","Maximum Horse Power Rating":"75 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":"116 A 380 V 116 A 460 V","Asynchronous motor control profile":"Quadratic voltage/frequency ratio Energy saving ratio Constant voltage/frequency ratio with automatic IR compensation Constant voltage/frequency ratio Current flux vector control (FVC) without speed feedback","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.se.com/vn/en/product/ATV21WD55N4C/variable-speed-drive-atv21-55kw-75hp-480v-class-b-emc-filter-ip54/","alternativesUrl":"https://aoctrl.com/api/mcp/products/ATV21WD55N4C/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Schneider Electric provide for the ATV21WD55N4C?","answer":"The drive carries CE marking and complies with IEC 61800-5-1 (safety), EN 61800-3 (EMC) across multiple environment categories, and EN 55011 Group 1 Class B for conducted emissions. Pollution degree 3 per IEC 61800-5-1 is specified."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/ATV21WD55N4C","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/ATV21WD55N4C when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}