{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SQ2270-2YA03","brand":"Siemens","brandSlug":"siemens","productSlug":"5SQ2270-2YA03","canonicalUrl":"https://aoctrl.com/siemens/5SQ2270-2YA03","factsUrl":"https://aoctrl.com/api/mcp/products/5SQ2270-2YA03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SQ miniature circuit breaker, 5SQ2270-2YA03, 2-pole, C-curve, 3 A, 400 V AC, 3 kA per EN 60898, IP20.","salesMarkdown":"## Siemens SENTRON 5SQ2270-2YA03 — 2-pole C-curve MCB, 3 A, 400 V AC The Siemens SENTRON 5SQ2270-2YA03 is a 2-pole miniature circuit breaker with a C tripping characteristic, rated at 3 A and 400 V AC at 50 Hz. It provides a breaking capacity of 3 kA per EN 60898, which is the standard for overcurrent protection in residential and commercial final circuits. This unit switches the neutral conductor (2-pole switching with neutral), a feature required for single-phase circuits where the neutral must be disconnected for full isolation. It fits into standard distribution boards on a DIN rail, occupying 2 width units (roughly 36 mm). The C-curve characteristic (5–10× In) is chosen for circuits with a moderate inrush current — for example, a small compressor or a group of LED drivers — where a B-curve would nuisance-trip and a D-curve would allow too much energy through before opening. This is typical for final sub-circuits in a domestic or light commercial distribution board where the upstream fault level is limited. Overvoltage category 3 (rated impulse withstand voltage 4 kV) means it is suitable for fixed installations where the mains supply is not subject to direct lightning strikes. Energy limiting class 3 indicates the breaker limits the let-through energy (I²t) to a low level, reducing thermal stress on downstream wiring and equipment during a fault. This is a standard performance level for modern MCBs. The 55 mm installation depth fits standard flush-mount distribution boards and enclosures with a 45 mm or 58 mm back-box depth. The snap-on DIN rail mounting allows tool-less installation and removal. The 2-pole width (2 width units) occupies the same footprint as a standard single-pole MCB pair, so it replaces an existing 2-pole breaker without re-spacing the DIN rail.","metaTitle":"Siemens SENTRON 5SQ2270-2YA03 MCB, 2P C 3A, 400V AC","metaDescription":"Siemens SENTRON 5SQ2270-2YA03 miniature circuit breaker, 2-pole, C-curve, 3 A, 400 V AC, 3 kA breaking capacity per EN 60898. Current lifecycle stage. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Number of poles":"2","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":"2","Number of poles / Note":"2P","circuit-breaker / Design":"5SQ","Current / at AC / rated value":"3 A","Tripping characteristic class":"C","acc. to EN 60898 / rated value":"3 kA","Supply voltage / at AC / rated value":"400 V","Supply voltage frequency / rated value":"50 Hz","Product function / neutral conductor switching":"Yes"}},"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=524299&mlfb=5SQ2270-2YA03","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SQ2270-2YA03/alternatives.json"},"ai":{"faq":[{"question":"Will the 5SQ2270-2YA03 drop into a panel specified for the 5SQ2270-2YA04 without rewiring?","answer":"Yes, the two parts share the same 2-pole footprint, 55 mm depth, DIN rail mounting, and 2 width units. The only difference is the current rating: 3 A for the 5SQ2270-2YA03 versus 4 A for the 5SQ2270-2YA04. If the circuit load is 3 A or less, the 5SQ2270-2YA03 is a direct mechanical and electrical fit."},{"question":"What is the number of poles on the 5SQ2270-2YA03?","answer":"It is a 2-pole (2P) breaker, switching both the line and neutral conductors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SQ2270-2YA03","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/5SQ2270-2YA03 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}}