{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SQ2370-2YA40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SQ2370-2YA40","canonicalUrl":"https://aoctrl.com/siemens/5SQ2370-2YA40","factsUrl":"https://aoctrl.com/api/mcp/products/5SQ2370-2YA40","rawCanonicalId":null},"summary":{"shortDescription":"SENTRON 5SQ2370-2YA40, miniature circuit breaker, 3-pole, C-curve, 40 A, 3 kA per EN 60898 at 400 V AC, 50 Hz, IP20, pollution degree 3.","salesMarkdown":"The 5SQ2370-2YA40 is a 3-pole miniature circuit breaker from the SENTRON 5SQ series, rated 40 A at 400 V AC with a C-trip curve. IP20 finger-safe terminals are standard for enclosed distribution boards. No neutral pole is switched — this is a 3-pole-only device for 3-phase loads where the neutral is not interrupted. The 5SQ design uses the same modular footprint as other SENTRON 5SQ breakers, so swapping between current ratings within the series is a direct rail-clip exchange without rewiring the busbar. ## How it compares to lower-current siblings The 5SQ2370-2YA40 shares the same 3-pole, C-curve, 3 kA breaking capacity, 400 V AC, and 55 mm depth as the 5SQ2370-2YA05 (0.5 A), 5SQ2370-2YA04 (4 A), and 5SQ2370-2YA01 (1 A). The only difference is the 40 A current rating. If your panel was originally specified for a 5SQ2370-2YA05 at 0.5 A, the 40 A version will not drop in without a busbar and conductor re-rating — the physical footprint is identical, but the protection level is completely different. For a like-for-like replacement at the same current, stick to the same rating.","metaTitle":"SENTRON 5SQ2370-2YA40 MCB, 3-Pole C40, 3 kA, 400 V","metaDescription":"SENTRON 5SQ2370-2YA40 miniature circuit breaker, 3-pole, C-curve, 40 A, 3 kA breaking capacity per EN 60898 at 400 V AC. Current lifecycle. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Number Of Poles":"3","Type Of Voltage":"AC/DC","lifecycle_stage":"current","Installation Depth":"55 mm","Product Brand Name":"SENTRON","Degree of pollution":"3","Product designation":"Miniature circuit breaker","Protection class IP":"IP20","Overvoltage Category":"3","Design of the product":"Miniature circuit breaker 5SQ","Energy limiting class":"3","Number Of Width Units":"3","Number of poles / Note":"3P","circuit-breaker / Design":"5SQ","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","Operating current / at AC / rated value":"40 A","Product function / neutral conductor switching":"No"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$101.54","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=359627&mlfb=5SQ2370-2YA40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SQ2370-2YA40/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SQ2370-2YA40?","answer":"3 kA per EN 60898 at 400 V AC, which is the standard for this class of miniature circuit breaker in residential and light industrial distribution boards."},{"question":"Where can I buy 5SQ2370-2YA40 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock or price figures are published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SQ2370-2YA40","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/5SQ2370-2YA40 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}}