{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ATV21WU55N4","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"ATV21WU55N4","canonicalUrl":"https://aoctrl.com/schneider/ATV21WU55N4","factsUrl":"https://aoctrl.com/api/mcp/products/ATV21WU55N4","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Altivar 21 variable speed drive, ATV21WU55N4, 5.5 kW, 3-phase 380-480 VAC, IP20, with integrated class A EMC filter.","salesMarkdown":"The Schneider Electric ATV21WU55N4 is a 5.5 kW (7.5 HP) variable-frequency drive from the Altivar 21 family, built on a 380–480 V three-phase supply with an integrated class A EMC filter and an IP54 enclosure. Its target application is HVAC — centrifugal pumps, cooling-tower fans, air-handling units, and condenser-water loops where the drive lives in a mechanical room rather than a clean panel. **This drive is obsolete.** Schneider announced the phase-out of the Altivar 21 series and the recommended successor is the ATV212 range. The direct cross-reference for the ATV21WU55N4 is the **ATV212WU55N4** — same power rating, same voltage class, updated control board with native BACnet support instead of requiring an option card. If your facility runs a fleet of ATV21 drives and you want to keep a common spare on the shelf, we can still source the ATV21WU55N4 through independent channels. Reference pricing is approximately $1,408 but varies with availability — the obsolete status means pricing moves with remaining channel inventory. ## Key ratings | Parameter | Value | |---|---| | Motor power | 5.5 kW (7.5 HP) | | Supply | 380–480 VAC, 3-phase, 50/60 Hz | | Line current | 10.9 A at 380 V / 8.6 A at 480 V | | Output current (cont.) | 12 A | | Transient overtorque | 120% × Tn for 60 s | | Switching frequency | 6–16 kHz (derate above 12 kHz) | | Enclosure | IP54 | | EMC filter | Class A, integrated | | Dimensions (H×W×D) | 340 × 230 × 208 mm | | Weight | Approx. 11 kg | | Communication | Modbus RTU (RS-485); optional BACnet / LonWorks / METASYS N2 cards | ## What the IP54 enclosure means in an HVAC mechanical room IP54 is dust-protected and splash-proof from any direction — not washdown-rated, not immersion-rated. That is the right enclosure class for a drive mounted on a wall next to a chiller or in a fan penthouse where it might see condensation drips or a stray hose spray during coil cleaning. It is not sealed well enough for a cooling-tower deck exposed to direct weather. If your mechanical room is unconditioned and hits 40 °C ambient in summer, derate output current by approximately 2.5% per degree above 40 °C up to the 50 °C maximum. ## If you are replacing one that failed Before ordering a replacement, check the nameplate on the failed drive: - **ATV21WU55N4** vs **ATV21WU55N4C** — the \"C\" variant has a different EMC configuration for IT (ungrounded) supplies. Do not swap them without checking the supply type. - The drive stores parameters in non-volatile memory. If the old drive still powers up, upload the parameter set via the RJ45 Modbus port before disconnecting it. The ATV212 successor does not directly import ATV21 parameter files — you will need to re-enter the motor nameplate data, ramp times, and PI loop gains manually. ## Sourcing We can quote the ATV21WU55N4 as long as channel inventory exists. If your timeline allows, we recommend the ATV212WU55N4 successor instead — it is in active production, BACnet is native, and lead times are shorter. Send your BOM for a line-item quote covering the drive plus any option cards and line reactors.","metaTitle":"ATV21WU55N4 Schneider Altivar 21 VFD, 5.5kW 7.5HP, 480V, IP54 — Obsolete","metaDescription":"Schneider ATV21WU55N4 Altivar 21 VFD: 5.5kW (7.5HP), 380–480V 3-phase, IP54, integrated EMC filter. Obsolete — replacement ATV212WU55N4 available. RFQ for stock check or cross-reference.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":[],"specifications":{"Depth":"8.2 in (208 mm)","Phase":"3 phase","Width":"9.06 in (230 mm)","title":"ATV21WU55N4","Height":"13.4 in (340 mm)","Marking":"CE","Category":"22157-ATV212 1 - 25 HP 460 VOLT","Standards":"IEC 61800-3 environments 1 category C3 EN 61800-5-1 EN 61800-3 EN 55011 class A group 1 EN 61800-3 environments 1 category C2 IEC 61800-3 environments 1 category C2 EN 61800-3 environments 2 category C1 EN 61800-3 environments 2 category C2 IEC 61800-3 category C2 IEC 61800-3 environments 1 category C1 EN 61800-3 category C2 EN 61800-3 environments 1 category C3 IEC 61800-3 environments 2 category C3 EN 61800-3 environments 1 category C1 IEC 61800-3 EN 61800-3 category C3 IEC 61800-3 environments 2 category C1 EN 61800-3 environments 2 category C3 IEC 61800-5-1 IEC 61800-3 environments 2 category C2 IEC 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":"55 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 - 5.5kW 7.5HP - 480V - EMC filter class A - IP54","Line current":"10.9 A 380 V 8.6 A 480 V","Apparent power":"9.1 kVA 380 V","Assembly style":"With heat sink","Component name":"ATV21","Connector Type":"1 RJ45","Motor power kW":"5.5 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":"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 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":"12...16 kHz with derating factor 6...16 kHz adjustable","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 device identification (43) Write multiple registers (16) 2 words maximum Monitoring inhibitable Read holding registers (03) 2 words maximum","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 Adjustable Automatic whatever the load","Maximum transient current":"13.2 A 60 s","Product or Component Type":"Variable speed drive","Maximum Horse Power Rating":"7.5 hp","Communication Port Protocol":"Modbus","Nominal switching frequency":"12 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":"12 A 380 V 12 A 460 V","Asynchronous motor control profile":"Current flux vector control (FVC) without speed feedback Constant voltage/frequency ratio Constant voltage/frequency ratio with automatic IR compensation Quadratic voltage/frequency ratio Energy saving 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":"$1,408.34","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a7e2ece11074708a2c92f3ba19575bec.pdf","sourceUrl":"https://www.se.com/us/en/product/ATV21WU55N4/variable-speed-drive-atv21-5-5kw-7-5hp-480v-emc-filter-class-a-ip54/","alternativesUrl":"https://aoctrl.com/api/mcp/products/ATV21WU55N4/alternatives.json"},"ai":{"faq":[{"question":"What is the closest alternative to ATV21WU55N4 in the Altivar family?","answer":"Within the Altivar 21 range, the ATV21WU55N4 is the 5.5 kW variant for 380-480 V three-phase supplies. The same frame size covers adjacent power ratings; the deciding factor is motor power matching."},{"question":"What compliance documentation does Schneider provide for ATV21WU55N4?","answer":"The drive carries CE marking and is certified to IEC 61800-3 (EMC environments 1 and 2, categories C1-C3) and IEC 61800-5-1 (safety). An integrated class A EMC filter is included."},{"question":"Where can I buy ATV21WU55N4 and how is it quoted?","answer":"The ATV21WU55N4 is sourced to order through independent industrial distribution. Availability and current pricing are confirmed at quote time against an RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/ATV21WU55N4","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/ATV21WU55N4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:21:01.794Z","lastPublished":"2026-09-02T08:21:01.794Z","indexable":true}}