{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201M-B20","brand":"ABB","brandSlug":"abb","productSlug":"S201M-B20","canonicalUrl":"https://aoctrl.com/abb/S201M-B20","factsUrl":"https://aoctrl.com/api/mcp/products/S201M-B20","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200M series, S201M-B20 miniature circuit breaker, 1-pole, 20 A, Trip Curve B, 277 VAC / 60 VDC, 6 kA interrupting rating, DIN rail mount.","salesMarkdown":"It's a current-production part, so you're not chasing an obsolete code. Rated for 277 VAC and 60 VDC, with a 6 kA interrupting rating on AC and 10 kA on DC. The 1-pole form factor keeps panel density tight; you can stack multiple units side by side in a single row. The closest functional peer is the S201M-C40 — same 1-pole DIN-rail footprint, same 277 VAC / 60 VDC ratings, same 6/10 kA interrupting capacity. If your BOM was built around the C40 but the actual load is resistive (heaters, lighting, control power), the B20 drops in without rewiring and gives better nuisance-trip margin on those low-inrush circuits. The 20 A rating on this B20 versus 40 A on the C40 is the other obvious split — size the breaker to the load, not the curve. ## Panel integration and field swap The 1-pole width is roughly 17.5 mm — plan your enclosure fill factor accordingly. Terminal screws accept up to 25 mm² conductor; torque to 2.0 Nm. For a field swap, isolate the circuit, check the nameplate matches the PO (20 A, Curve B, 1-pole), and lever the old unit off the rail with a flathead screwdriver in the clip slot. No rewiring needed if the load hasn't changed.","metaTitle":"ABB S201M-B20 S200M MCB, 20A, Curve B, 1-Pole, 277VAC","metaDescription":"ABB S201M-B20 S200M miniature circuit breaker, 20 A, Trip Curve B, 1-pole, 277 VAC / 60 VDC, 6 kA interrupting rating. Current-production part 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 B","Poles":"1","title":"S201M-B20","Mounting":"DIN Rail","Volts AC":"277","Volts DC":"60","description":"ABB S201M-B20 S200M MCB 230V 1 POLE|ABB S201MB20 S200M MCB 230V 1","lifecycle_stage":"current","Interrupt Rating AC":"6 kA","Interrupt Rating DC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$14.81","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8bf9b25eb1bcae6281248c766259013a.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy S201M-B20 and how do I get a price?","answer":"The S201M-B20 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 price and lead time."},{"question":"Will S201M-B20 drop into a panel that was specified around S201M-C40 without rewiring?","answer":"Yes — same 1-pole DIN-rail footprint, same 277 VAC / 60 VDC ratings, same interrupting capacity. The swap is mechanical and electrical; the only functional difference is the trip curve (B vs. C) and the amp rating (20 A vs. 40 A). Verify the load current and inrush characteristic before substituting."},{"question":"What is S201M-B20's listed amps and trip curve?","answer":"The S201M-B20 is rated for 20 A with a Trip Curve B characteristic (3–5x In), 1-pole, 277 VAC / 60 VDC."},{"question":"What compliance documentation does ABB provide for S201M-B20?","answer":"ABB provides RoHS, REACH, CE, and UL 489 compliance documentation for the S200M family. The nameplate carries the relevant marks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201M-B20","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/S201M-B20 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}}