{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SQ2170-0KA40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SQ2170-0KA40","canonicalUrl":"https://aoctrl.com/siemens/5SQ2170-0KA40","factsUrl":"https://aoctrl.com/api/mcp/products/5SQ2170-0KA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SQ series, miniature circuit breaker (MCB), 5SQ2170-0KA40, 1-pole, C tripping characteristic, 40 A rated current, 3 kA breaking capacity per EN 60898, 240 V AC/DC, IP20.","salesMarkdown":"The Siemens SENTRON 5SQ2170-0KA40 is a 1-pole miniature circuit breaker (MCB) with a C tripping characteristic, rated at 40 A continuous current at 240 V AC, 50 Hz. Snaps onto DIN rail. IP20 terminals, overvoltage category III, AC/DC up to 240 V. Energy limiting class 3 means this MCB limits the let-through energy (I²t) during a short circuit, reducing thermal stress on downstream wiring and connected equipment. That matters when coordinating with downstream loads — the breaker clears fast enough that the cable can be sized to the load current rather than the full fault current.","metaTitle":"Siemens SENTRON 5SQ2170-0KA40 MCB, 1P, C, 40 A, 3 kA","metaDescription":"Siemens SENTRON 5SQ2170-0KA40 miniature circuit breaker, 1-pole, C-curve, 40 A, 3 kA breaking capacity per EN 60898, 240 V AC/DC. Current lifecycle stage. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Number of poles":"1","Type of voltage":"AC/DC","lifecycle_stage":"current","Installation depth":"55 mm","Product brand name":"SENTRON","Protection class IP":"IP20","Overvoltage category":"3","Energy limiting class":"3","Number of width units":"1","Number of poles / Note":"1P","circuit-breaker / Design":"5SQ","Current / at AC / rated value":"40 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"3 kA","Supply voltage / at AC / rated value":"240 V","Supply voltage frequency / rated value":"50 Hz","Product function / neutral conductor switching":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=263477&mlfb=5SQ2170-0KA40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SQ2170-0KA40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 5SQ2170-0KA40?","answer":"Within the same SENTRON 5SQ family, the 5SQ2170-2YA15 is the closest functional peer — same 1-pole, C-curve, 3 kA breaking capacity, 240 V AC/DC, and 55 mm depth. The difference is the current rating: 5SQ2170-2YA15 is 1.6 A versus the 40 A of 5SQ2170-0KA40. They share the same footprint and DIN-rail mounting, so a panel designed for one can accept the other without rewiring, provided the load current matches the new rating."},{"question":"What is the number of poles on 5SQ2170-0KA40?","answer":"It is a 1-pole (1P) breaker — switches and protects only the line conductor. Neutral is not switched or monitored by this unit."},{"question":"Will 5SQ2170-0KA40 drop into a panel specified around 5SQ2170-2YA15 without rewiring?","answer":"Yes — both are 1-pole, C-curve MCBs with the same 55 mm depth, 1 width unit, and DIN-rail mounting. The only difference is the current rating (40 A vs 1.6 A). As long as the load current is within the 40 A rating, the panel wiring and busbar arrangement remain unchanged."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SQ2170-0KA40","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/5SQ2170-0KA40 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}}