{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201-D2","brand":"ABB","brandSlug":"abb","productSlug":"S201-D2","canonicalUrl":"https://aoctrl.com/abb/S201-D2","factsUrl":"https://aoctrl.com/api/mcp/products/S201-D2","rawCanonicalId":null},"summary":{"shortDescription":"ABB S201-D2, 1-pole miniature circuit breaker, 2 A, Trip Curve D, 6 kA interrupting rating at 277 VAC, DIN rail mount, UL 1077 supplementary protector.","salesMarkdown":"It's a UL 1077 supplementary protector, so it's not a service-entrance main breaker but rather a branch-circuit component inside a control panel or downstream of a listed branch-circuit overcurrent device. Rated for 277 VAC line-to-neutral on a 480Y/277 V system, or 60/110 VDC for DC control circuits. Curve D trips magnetically at 10–20 times rated current (20–40 A for this 2 A breaker), compared to Curve C at 5–10x. That wider magnetic trip band is what lets it ride through the inrush of a small motor, a DC power supply's input capacitor bank, or a control transformer without dropping out. But it also means the breaker won't protect a resistive load against a modest overload as quickly — the thermal element still handles the long-time region, but for short-circuit protection, the fault needs to be high enough to push into the magnetic zone. If your load is purely resistive (heaters, incandescent lamps), a Curve C or B would be a better fit.","metaTitle":"S201-D2 Miniature Circuit Breaker 1P D 2A, 6 kA, DIN Rail","metaDescription":"S201-D2 MCB, 1-pole, 2 A, Trip Curve D, 6 kA interrupting at 277 VAC. UL 1077 supplementary protector, DIN rail mount. Current lifecycle stage; sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Amps":"2","Type":"Trip Curve D","Poles":"1","title":"S201-D2","Mounting":"DIN Rail","Volts AC":"277","description":"LEGACY SEE REPLACEMENT MCB 1P D 2A|Miniature Circuit Breaker, Supplementary Protector, Rated Current 2 Amps, 1 Pole, Interrupt Rating 6 kA, Thermal Magnetic Trip Curve D, Voltage up to 277/Y480 VAC, 60/110 VDC, DIN Rail Mounted, Finger Safe and Multi-Function Terminals, UL 1077, CSA 22.2 No. 235","lifecycle_stage":"current","Interrupt Rating AC":"6 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$85.65","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7b0599cc6b7842d0be99baa27a8305eb.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the interrupting rating of the S201-D2?","answer":"6 kA at 277 VAC, which is the standard interrupting capacity for this series on a 277/480 VAC system. For higher fault currents (10 kA), look at the S203 variants in the same family."},{"question":"Will the S201-D2 drop into a panel specified for the S201M-C3?","answer":"Physically yes — both are 1-pole DIN-rail breakers with the same footprint. But the S201M-C3 is a 3 A Curve C, while this is a 2 A Curve D. The Curve D handles higher inrush, so it's not a direct electrical swap unless the load's inrush characteristics match. If the original spec called for 3 A Curve C, dropping in a 2 A Curve D could nuisance-trip on steady-state current or fail to protect the circuit correctly."},{"question":"Where can I buy the S201-D2?","answer":"We source it to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here, but we can quote firm lead times and unit pricing on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201-D2","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-D2 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}}