{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"ACS550-U1-125A-4","brand":"ABB","brandSlug":"abb","productSlug":"ACS550-U1-125A-4","canonicalUrl":"https://aoctrl.com/abb/ACS550-U1-125A-4","factsUrl":"https://aoctrl.com/api/mcp/products/ACS550-U1-125A-4","rawCanonicalId":null},"summary":{"shortDescription":"ABB ACS550 family, general purpose drive, 3-phase 380-480 VAC supply, 75 Hp heavy duty / 100 Hp normal duty, frame R5 NEMA 1 wall mount, order code ACS550-U1-125A-4.","salesMarkdown":"## What the drive is The ABB ACS550-U1-125A-4 is a general purpose variable-frequency drive in the ACS550 family, built for 3-phase 380-480 VAC supply and 3-phase output, with a 75 Hp nameplate and a frame size of R5 in a NEMA 1 wall-mount enclosure. That headline horsepower is the heavy-duty figure; the same frame delivers 100 Hp in normal duty, with output current shifting from 96 A in heavy duty to 124 A in normal duty on the same 3-phase output stage. The mechanical envelope is 29.0 in tall, 10.5 in wide, and 11.3 in deep, sized for a wall-mount NEMA 1 cabinet layout rather than a through-panel mount. ## Reading the duty curves Two current numbers travel with one order code. 124 A pairs with 100 Hp in normal duty; 96 A pairs with 75 Hp in heavy duty on the same 3-phase output stage. Specifying the wrong curve is the most common way this frame gets blamed for nuisance trips — a fan or pump application that pulls a constant-torque conveyor load past 96 A will fold the drive back into current limit, while the same drive on a centrifugal pump at 124 A is comfortably inside its normal-duty envelope. ## Panel-side integration notes The 3-phase input on 380-480 VAC lines up with the standard industrial distribution voltage on 480 V systems, so the drive drops into existing MCC topologies without a transformer tap change, and the 3-phase output feeds the motor without a reactor on most installations. The NEMA 1 wall-mount enclosure is intended for an indoor control room or a clean equipment room, not a washdown area. The 29.0 in height fits within a standard cabinet section for cable bend and fan clearance.","metaTitle":"ABB ACS550-U1-125A-4 VFD, 75 Hp, 480 VAC 3-Phase","metaDescription":"ABB ACS550-U1-125A-4 general purpose drive, 75 / 100 Hp, 380-480 VAC 3-phase, frame R5, NEMA 1 wall mount, 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":"75 Hp, 100 Hp, ACS550, VFD, N1|3-Phase Supply Voltage, 380 - 480V AC, NEMA 1, Wall Mount Drive. 3-Phase Output, Normal Duty: 100 Hp. Heavy Duty: 75 Hp. Normal Duty: 124 Amp. Heavy Duty: 96 Amp. Frame Size: R5. H: 29.0\" W: 10.5\" D: 11.3\".","Volts AC":"480","Horsepower":"75","description":"75 Hp, 100 Hp, ACS550, VFD, N1|3-Phase Supply Voltage, 380 - 480V AC, NEMA 1, Wall Mount Drive. 3-Phase Output, Normal Duty: 100 Hp. Heavy Duty: 75 Hp. Normal Duty: 124 Amp. Heavy Duty: 96 Amp. Frame Size: R5. H: 29.0\" W: 10.5\" D: 11.3\".","Family / Style":"ACS550","lifecycle_stage":"eol_hot"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$8,245.39","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/51c35cb14b7edab5a06d09f26d554d90.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is ACS550-U1-125A-4's listed phase?","answer":"The drive is 3-phase on both the supply and the output side, rated for 380-480 VAC input."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/ACS550-U1-125A-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-U1-125A-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}}