{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S202MR-K4","brand":"ABB","brandSlug":"abb","productSlug":"S202MR-K4","canonicalUrl":"https://aoctrl.com/abb/S202MR-K4","factsUrl":"https://aoctrl.com/api/mcp/products/S202MR-K4","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200MR series, 2-pole miniature circuit breaker, S202MR-K4, 4 A rated, Trip Curve K, 277 VAC, 10 kA interrupting capacity, DIN rail mount.","salesMarkdown":"## Panel fit and protection profile The Curve K trip profile provides magnetic tripping between 8 and 12 times rated current — this makes it suitable for protecting circuits with moderate inrush, such as motor starters, transformers, or solenoid valve banks, where a standard B-curve would nuisance-trip on startup. Rated at 277 VAC with a 10 kA interrupting capacity, the S202MR-K4 handles fault currents typical in commercial lighting and small motor branch circuits. For a panel OEM wireman, the DIN rail footprint keeps fill factor predictable; two poles take 36 mm of rail width (standard 18 mm per pole), so plan gland plate space accordingly. For a site electrical engineer working on fault coordination: the 10 kA interrupting rating at 277 VAC gives headroom for most downstream faults in a 277/480 V lighting panel. Curve K's magnetic trip threshold (8–12x In) means this breaker will hold through a motor start but trip fast on a bolted fault — useful for achieving Type 2 coordination with a contactor or soft starter downstream. No single point of failure here if the upstream device is properly coordinated.","metaTitle":"S202MR-K4 2-Pole MCB 4A Curve K 277VAC DIN Rail","metaDescription":"S202MR-K4 2-pole miniature circuit breaker, 4 A rated, Trip Curve K, 277 VAC, 10 kA interrupting capacity. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Amps":"4","Type":"Trip Curve K","Poles":"2","Mounting":"DIN Rail","Volts AC":"277","lifecycle_stage":"current","Interrupt Rating AC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/05467d08806371d98f5ad74b4fbfb7e4.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S202MR-K4/alternatives.json"},"ai":{"faq":[{"question":"What is the S202MR-K4's rated current and trip curve?","answer":"The S202MR-K4 is rated at 4 A with a Trip Curve K characteristic (magnetic trip between 8 and 12 times rated current). It is a 2-pole breaker rated for 277 VAC with a 10 kA interrupting capacity."},{"question":"Where can I buy the S202MR-K4?","answer":"The S202MR-K4 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will the S202MR-K4 drop into a panel specified for the S202M-B10 without rewiring?","answer":"Both the S202MR-K4 and S202M-B10 share the same 2-pole DIN rail footprint and 277 VAC voltage rating. However, the S202MR-K4 uses a Curve K trip characteristic (8–12x In) while the S202M-B10 uses a B-curve (3–5x In). The physical fit is identical, but the trip curve difference means the S202MR-K4 will tolerate higher inrush currents — verify coordination with downstream loads before swapping without a design review."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S202MR-K4","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/S202MR-K4 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}}