{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SQ2170-2YA03","brand":"Siemens","brandSlug":"siemens","productSlug":"5SQ2170-2YA03","canonicalUrl":"https://aoctrl.com/siemens/5SQ2170-2YA03","factsUrl":"https://aoctrl.com/api/mcp/products/5SQ2170-2YA03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SQ series, miniature circuit breaker, 1-pole, C-curve, 3 A, 3 kA breaking capacity per EN 60898, 240 VAC, 1 MW unit.","salesMarkdown":"## Panel fit and derating The Siemens 5SQ2170-2YA03 is a 1-pole SENTRON miniature circuit breaker with C-curve tripping, rated 3 A at 30 °C and 240 VAC. EN 60898 certifies the breaker for overcurrent protection in household and similar installations. For industrial feeder panels with higher prospective fault current, check the upstream SCCR coordination. Temperature derating is published: at 40 °C the continuous rating drops to 2.78 A, at 50 °C to 2.61 A, and at 60 °C to 2.4 A. The C-curve (tripping characteristic class C) means the magnetic trip fires between 5× and 10× In — so for a 3 A breaker, instantaneous trip starts between 15 A and 30 A. If the load is purely resistive with no inrush, a B-curve would give tighter protection; for high-inrush welders or drives, a D-curve would avoid nuisance trips. This C-curve is the general-purpose middle ground. Degree of pollution 3 and overvoltage category 3 mean the breaker is rated for the conductive environment inside a typical industrial panel — not for clean-room or sealed electronics cabinets. Pollution degree 3 permits occasional condensation and temporary conductivity; overvoltage category 3 covers fixed-installation equipment with transient overvoltages up to 4 kV at 240 VAC. ## Installation note Installation depth is 55 mm, which is the standard SENTRON 5SQ footprint. It occupies one 18 mm modular-width unit on the DIN rail. The single-pole design switches only the line conductor — neutral conductor switching is not provided (the product component field confirms no neutral switching). For single-phase circuits where the neutral must be switched, pair this with a compatible neutral-switching module or specify a 2-pole variant.","metaTitle":"Siemens 5SQ2170-2YA03 SENTRON MCB, 1-pole C 3A, 3 kA","metaDescription":"Siemens SENTRON 5SQ2170-2YA03 miniature circuit breaker, 1-pole, C-curve, 3 A rated at 30 °C, 3 kA per EN 60898, 240 VAC. Current production. Quoted on request.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Number Of Poles":"1","lifecycle_stage":"current","Installation Depth":"55 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"3 A","protection class IP":"IP20","Overvoltage Category":"3","Design Of The Product":"Miniature circuit breaker 5SQ","Energy Limitation Class":"3","at 30 °C / rated value":"3 A","at 40 °C / rated value":"2.78 A","at 45 °C / rated value":"2.69 A","at 50 °C / rated value":"2.61 A","at 55 °C / rated value":"2.51 A","at 60 °C / rated value":"2.4 A","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","acc. to EN 60898 / rated value":"3 kA","supply voltage / at AC / rated value":"240 V","Type Of Voltage / Of The Operating Voltage":"AC/DC","Product Component / 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=517026&mlfb=5SQ2170-2YA03","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SQ2170-2YA03/alternatives.json"},"ai":{"faq":[{"question":"What is the number of poles on 5SQ2170-2YA03?","answer":"It is a 1-pole miniature circuit breaker. It switches only the line conductor; neutral conductor switching is not included."},{"question":"Will 5SQ2170-2YA03 drop into a panel specified around 5SQ2370-2YA05?","answer":"The 5SQ2370-2YA05 is a 3-pole, 0.5 A breaker in the same 5SQ family with identical 55 mm depth and IP20 rating. The 5SQ2170-2YA03 is a single-pole unit, so it fits the same DIN-rail footprint but only occupies one modular width instead of three. No rewiring is needed if the panel was laid out for single-pole breakers; if the panel was wired for a 3-pole device, you would need to adapt the busbar and load connections."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SQ2170-2YA03","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/5SQ2170-2YA03 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}}