{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ACS550-U1-08A8-4","brand":"ABB","brandSlug":"abb","productSlug":"ACS550-U1-08A8-4","canonicalUrl":"https://aoctrl.com/abb/ACS550-U1-08A8-4","factsUrl":"https://aoctrl.com/api/mcp/products/ACS550-U1-08A8-4","rawCanonicalId":null},"summary":{"shortDescription":"ABB, ACS550 series, general-purpose AC drive, order code ACS550-U1-08A8-4, 3-phase supply 380–480 V AC, 5 Hp normal duty / 3 Hp heavy duty, 8.8 A normal / 6.9 A heavy, NEMA 1 wall-mount, frame R1.","salesMarkdown":"## What the order code resolves to The ABB ACS550-U1-08A8-4 sits in the ACS550 general-purpose drive line as a 3-phase 480 VAC unit, listed at 5 Hp with a frame R1 NEMA 1 wall-mount enclosure. ABB publishes two ratings on the same frame because the drive carries two different duty profiles: Normal Duty at 5 Hp with 8.8 A output current, and Heavy Duty at 3 Hp with 6.9 A output current. The lower current number is not a derating — it is the heavier thermal class where the drive takes the next lower motor size to give the IGBT module and DC bus more margin per amp. For a BOM line, the figure that decides fit is the 8.8 A Normal Duty rating if the application is a fan, pump or lightly-loaded conveyor, and the 6.9 A Heavy Duty rating if it is a constant-torque load such as a compressor, extruder or mixer. Specifying the wrong duty class is the most common reason an ACS550 comes back undersized. ## Mechanical envelope and panel fit Frame R1 is the smallest ACS550 wall-mount chassis, published at H: 14.5, W: 4.9, D: 8.3 inches in the listing description. That footprint is what the panel wireman plans the gland plate cut-out and the clearance around the heatsink fins against — the drive needs airflow top and bottom for the rating above to hold in an enclosed cabinet. NEMA 1 means the enclosure is intended for indoor wall mounting with finger-safe guarding, not for washdown or outdoor siting. If the line has dust or hose-down exposure, the panel builder should plan a separate enclosure rather than rely on the drive's own NEMA 1 skin. ## Where the ACS550 class is used The ACS550-U1 series is the general-purpose VFD tier in ABB's drives catalog, typically deployed for fan, pump and simple conveyor duty in HVAC, water/wastewater and light industrial machinery — applications where the 380–480 V AC three-phase supply and the Normal Duty curve line up with a standard induction motor.","metaTitle":"ABB ACS550-U1-08A8-4 VFD, 480V 3-Phase, 5 Hp","metaDescription":"ABB ACS550-U1-08A8-4 general-purpose drive, 3-phase 480 VAC, 5 Hp normal duty / 3 Hp heavy duty, 8.8 A / 6.9 A, NEMA 1 wall-mount frame R1. Quoted to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["AC Drive (VFD) 480V"],"specifications":{"Type":"General Purpose Drive","Phase":"3","title":"3 Hp, 5 Hp, ACS550, VFD, N1|3-Phase Supply Voltage, 380 - 480V AC, NEMA 1, Wall Mount Drive. 3-Phase Output, Normal Duty: 5 Hp. Heavy Duty: 3 Hp. Normal Duty: 8.8 Amp. Heavy Duty: 6.9 Amp. Frame Size: R1. H: 14.5 W: 4.9\" D: 8.3\"\"","Volts AC":"480","Horsepower":"5","description":"3 Hp, 5 Hp, ACS550, VFD, N1|3-Phase Supply Voltage, 380 - 480V AC, NEMA 1, Wall Mount Drive. 3-Phase Output, Normal Duty: 5 Hp. Heavy Duty: 3 Hp. Normal Duty: 8.8 Amp. Heavy Duty: 6.9 Amp. Frame Size: R1. H: 14.5 W: 4.9\" D: 8.3\"\"","lifecycle_stage":"eol_hot"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2,717.91","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/51c35cb14b7edab5a06d09f26d554d90.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What type of drive is the ACS550-U1-08A8-4?","answer":"It is listed as a General Purpose Drive in ABB's ACS550 line, 3-phase, rated 480 VAC."},{"question":"What horsepower and current does the ACS550-U1-08A8-4 carry?","answer":"Normal Duty is 5 Hp at 8.8 A and Heavy Duty is 3 Hp at 6.9 A on the same R1 frame."},{"question":"What is the closest functional second-source to the ACS550-U1-08A8-4?","answer":"Within the ABB catalog, the ACS580-01-012A-4 is listed as a 3-phase 480 VAC general-purpose drive at the same 5 Hp rating point, putting it in the same functional class on a second-source short list. It is not a parameter-compatible drop-in — the ACS580 uses a different keypad and commissioning flow."},{"question":"How is the ACS550-U1-08A8-4 sourced and what is the lead time?","answer":"The part is quoted to order against a buyer RFQ. Send the BOM line with the duty class (Normal 5 Hp / 8.8 A or Heavy 3 Hp / 6.9 A) and the supply panel rating (380–480 V AC 3-phase) so the quote reflects the configuration the line actually needs."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/ACS550-U1-08A8-4","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/abb/ACS550-U1-08A8-4 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}}