{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201-D20","brand":"ABB","brandSlug":"abb","productSlug":"S201-D20","canonicalUrl":"https://aoctrl.com/abb/S201-D20","factsUrl":"https://aoctrl.com/api/mcp/products/S201-D20","rawCanonicalId":null},"summary":{"shortDescription":"ABB S201-D20, miniature circuit breaker, 1 pole, 20 A, D trip curve, 277 VAC, 6 kA interrupting capacity, DIN rail mount.","salesMarkdown":"The ABB S201-D20 is a 1-pole miniature circuit breaker rated 20 A with a D trip curve, meaning it tolerates the high inrush currents typical of motor and transformer loads before tripping on sustained overload — the D curve's magnetic trip threshold sits around 10–20× rated current, so a motor starting surge won't nuisance-trip it the way a B or C curve would. No rewiring or panel rework if you're swapping in a panel that already holds S200 breakers. ## D curve vs C curve — the real difference The closest functional peer is the S201M-C10, a 10 A C-curve single-pole in the same mechanical package. The D curve on this S201-D20 shifts the magnetic trip from 5–10× rated (C curve) to 10–20× rated, so it's the right choice when the load is a small motor, a transformer primary, or a bank of LED drivers that pull a short high inrush on energization. The C curve would nuisance-trip on that same inrush; the D curve holds through it. If your panel was specified around the S201M-C10 but the load changed to something with higher inrush, the S201-D20 drops into the same DIN-rail slot with the same wiring — no terminal adapter, no busbar change. The only difference is the trip characteristic and the amp rating (20 A vs 10 A), so verify the conductor sizing and downstream device coordination before swapping. Torque to 2.8 Nm. The busbar comb slots into the bottom terminal for daisy-chaining multiple poles; leave the protective cover on the busbar fingers to maintain IP20 touch safety inside the panel. The 1-pole form factor means you can gang it with adjacent S200 breakers on a shared busbar for multi-pole configurations — two S201-D20s with a 2-pole busbar comb give you a 2-pole 20 A D-curve assembly, three give you 3-pole. The trip curves stay independent per pole, so a phase-to-phase fault clears on the affected pole only.","metaTitle":"S201-D20 Miniature Circuit Breaker, 20A, 1P, D Curve, 6 kA","metaDescription":"S201-D20 miniature circuit breaker, 20 A, 1 pole, D trip curve, 6 kA interrupting at 277 VAC. DIN rail mount, current lifecycle. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Amps":"20","Type":"Trip Curve D","Poles":"1","title":"S201-D20","Mounting":"DIN Rail","Volts AC":"277","description":"Circuit Breaker, Miniature, DIN Rail Mount, 20A, 1P, 480Y/277VAC|1 Pole, 20 Amps, Rated At 480Y/277 Volt AC, Ul 1077 Series, Miniature Circuit Breaker, with Thermal-Magnetic, Trip Device, D Curve, 65 kAIC","lifecycle_stage":"current","Interrupt Rating AC":"6 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$4.97","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/87704b026de7406632c67705104e052b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the S201-D20?","answer":"The S201-D20 is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the S201-D20's interrupting rating?","answer":"It interrupts faults up to 6 kA at 277 VAC."},{"question":"Will the S201-D20 drop into a panel built for the S201M-C10?","answer":"Yes — same DIN-rail footprint, same terminal layout, same busbar comb pattern. The only difference is the trip curve (D vs C) and the amp rating (20 A vs 10 A), so verify conductor sizing and coordination before swapping."},{"question":"What compliance documentation does ABB provide for the S201-D20?","answer":"The S201-D20 carries UL 1077 recognition and is part of ABB's System pro M compact series, which is CE-marked and RoHS-compliant. Specific declarations (REACH, UKCA, EAC) are available on request at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201-D20","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-D20 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}}