{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S801U-Z20","brand":"ABB","brandSlug":"abb","productSlug":"S801U-Z20","canonicalUrl":"https://aoctrl.com/abb/S801U-Z20","factsUrl":"https://aoctrl.com/api/mcp/products/S801U-Z20","rawCanonicalId":null},"summary":{"shortDescription":"ABB S800 series MCB, 1-pole, Z-curve, 20 A, order code S801U-Z20.","salesMarkdown":"The Z-curve is designed for sensitive electronic loads — it trips between 2.5x and 4x rated current, so it catches short-circuit faults fast enough to protect semiconductor rectifiers and control transformers without nuisance tripping on inrush. ## What the Z-curve means for fit The Z-curve is the key selection parameter here. Most MCBs in a panel are B- or C-curve for general distribution or motor circuits. The Z-curve sits between B and the ultra-sensitive K-curve, making it the right choice when the downstream load has a low short-circuit current tolerance — think PLC power supplies, instrumentation loops, or 24 VDC control transformers. It meets the load where it is without over-protecting and causing coordination headaches upstream.","metaTitle":"ABB S801U-Z20 MCB S800 1P Z 20A, Current Lifecycle","metaDescription":"ABB S801U-Z20 MCB S800 1P Z 20A miniature circuit breaker. Current lifecycle stage. Sourced to order against RFQ. Confirm availability and pricing at quote time.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/60a475cf34c409642ff95cc9edaa795f.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S801U-Z20/alternatives.json"},"ai":{"faq":[{"question":"What is the S801U-Z20 used for?","answer":"It is a 1-pole 20 A miniature circuit breaker with a Z-curve, used to protect sensitive electronic loads such as PLCs, instrumentation, and control transformers where a standard B- or C-curve would allow damaging overcurrents to persist too long."},{"question":"Where can I buy S801U-Z20?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S801U-Z20","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/S801U-Z20 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}}