{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S203-K20NA","brand":"ABB","brandSlug":"abb","productSlug":"S203-K20NA","canonicalUrl":"https://aoctrl.com/abb/S203-K20NA","factsUrl":"https://aoctrl.com/api/mcp/products/S203-K20NA","rawCanonicalId":null},"summary":{"shortDescription":"ABB S203-K20NA miniature circuit breaker, 4-pole, 20 A, Trip Curve K, 277 VAC, 10 kA interrupting rating, DIN rail mount.","salesMarkdown":"The S203-K20NA is a 4-pole miniature circuit breaker rated 20 A with Trip Curve K, meaning it trips magnetically between 8 and 12 times rated current — designed for loads with moderate inrush like motors, transformers, and solenoids where a standard Curve C would nuisance-trip on startup. The 4-pole configuration covers three-phase plus neutral, or you can use it as a switched neutral on a three-phase system. ## Deployment context The 4-pole format fits standard 4-module width; leave a finger's gap above and below for heat dissipation at full load.","metaTitle":"S203-K20NA 4-Pole MCB, 20 A, Curve K, 10 kA, DIN Rail","metaDescription":"S203-K20NA miniature circuit breaker, 4-pole, 20 A, Trip Curve K, 277 VAC, 10 kA interrupting rating. Current lifecycle. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Amps":"20","Type":"Trip Curve K","Poles":"4","title":"S203-K20NA","Mounting":"DIN Rail","Volts AC":"277","description":"Miniature Circuit Breaker, 4P, 20A|Miniature Circuit Breaker, 4 Pole, 20 Amp","lifecycle_stage":"current","Interrupt Rating AC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0a26e0a9171db6da747e966178220c27.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is S203-K20NA's interrupting rating?","answer":"10 kA at 277 VAC per pole, which is the standard fault-clearing capacity for this class of MCB in commercial distribution."},{"question":"Will S203-K20NA drop into a panel specified around S204-B32 without rewiring?","answer":"No — the S204-B32 is a 32 A Curve B device. The S203-K20NA is 20 A Curve K. Same 4-pole DIN-rail footprint, but the trip curve and current rating are different; you'd need to verify the load and coordination study before swapping."},{"question":"Where can I buy S203-K20NA?","answer":"Sourced to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S203-K20NA","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/S203-K20NA 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}}