{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201-K4A","brand":"ABB","brandSlug":"abb","productSlug":"S201-K4A","canonicalUrl":"https://aoctrl.com/abb/S201-K4A","factsUrl":"https://aoctrl.com/api/mcp/products/S201-K4A","rawCanonicalId":null},"summary":{"shortDescription":"ABB, S200 series, miniature circuit breaker, S201-K4A, K-characteristic, DIN rail mount, 0.12 kg.","salesMarkdown":"## What the K-curve means for fit The S201-K4A: The K-characteristic is the key spec here. It's designed to handle the inrush of motor loads and transformers without nuisance tripping — magnetic trip at 8–12x rated current, compared to the B-curve's 3–5x or C-curve's 5–10x. If you're protecting a pump, conveyor drive, or small transformer secondary, the K-curve is the right call. A B-curve would trip on startup; a D-curve might let a fault through before opening.","metaTitle":"ABB S201-K4A Circuit Breaker, K-Characteristic, DIN Rail","metaDescription":"ABB S201-K4A DIN rail miniature circuit breaker, K-curve. Active lifecycle. 0.12 kg. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Part #":"S201-K4A","Weight":"0.12 kgs","Category":"Circuit Breakers","Sub Category":"Din Rail Mount Circuit Breakers","Top Category":"Circuit Breakers, Fuses & Protection","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$128.46","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S201-K4A/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for S201-K4A?","answer":"The ABB SH201T-C16 is a peer in the same S200 family but with a C-curve characteristic — magnetic trip at 5–10x rated current. If your load is motor or transformer inrush, the K-curve of the S201-K4A is the correct fit. The SH201T-C16 would be more appropriate for general-purpose resistive or mixed loads. Both share the same DIN rail footprint and terminal style, so no rewiring needed if you swap, but the trip curve difference matters for coordination."},{"question":"Where can I buy the S201-K4A?","answer":"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 position."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201-K4A","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/S201-K4A 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}}