{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1SDA053999R1","brand":"ABB","brandSlug":"abb","productSlug":"1SDA053999R1","canonicalUrl":"https://aoctrl.com/abb/1SDA053999R1","factsUrl":"https://aoctrl.com/api/mcp/products/1SDA053999R1","rawCanonicalId":null},"summary":{"shortDescription":"ABB T4N 250 PR221DS-LS/I molded case circuit breaker, 250 A, order code 1SDA053999R1.","salesMarkdown":"The ABB 1SDA053999R1 is a T4N 250 molded case circuit breaker (MCCB) fitted with a PR221DS-LS/I electronic trip unit, rated at 250 A. This is the core overcurrent protection device for a distribution panel or motor control center branch — the trip unit gives you LS/I curves (long-time, short-time, instantaneous) for selective coordination downstream. If your panel already carries a T4N frame with a different trip unit, the PR221DS-LS/I is a drop-in swap — same mechanical dimensions, same mounting hardware. No re-drilling, no adapter plate. The 250 A continuous rating means the lug size accepts cable up to the breaker's terminal rating — typically 185 mm² Cu/Al for this frame class. Watch the heat dissipation at full load: the PR221DS draws its own operating power from the line-side sensing, so no auxiliary supply needed, but the breaker body needs free air circulation per the mounting clearance diagram. The LS/I trip unit lets you set the long-time pickup (Ir) down to 0.4× In (100 A) and the short-time and instantaneous thresholds independently — so this one breaker covers a wide range of downstream loads from a 100 A feeder to a 250 A main. For a motor branch circuit, set the instantaneous above the locked-rotor inrush; for a distribution feeder, coordinate the short-time delay with downstream breakers.","metaTitle":"ABB 1SDA053999R1 T4N 250 PR221DS-LS/I, 250 A MCCB","metaDescription":"ABB 1SDA053999R1 T4N 250 PR221DS-LS/I molded case circuit breaker, 250 A. Current lifecycle stage. Sourced to order against an RFQ. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/1SDA053999R1/alternatives.json"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 1SDA053999R1?","answer":"Within the same T4N frame, the alternative would be a different trip unit rating or type (e.g., PR221DS-LSIG for ground-fault protection). The mechanical dimensions and mounting are identical; only the trip curve electronics differ. For a direct functional replacement with the same LS/I curve at 250 A, stick with this exact order code."},{"question":"Where can I buy 1SDA053999R1 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a binding price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/1SDA053999R1","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/1SDA053999R1 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}}