{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1344-8RC40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1344-8RC40","canonicalUrl":"https://aoctrl.com/siemens/5SU1344-8RC40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1344-8RC40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SU1344-8RC40 RCBO, 40 A, 4-pole, 7 modules, D characteristic, Type A 30 mA.","salesMarkdown":"The Type A residual current detection (30 mA) handles pulsating DC fault currents from single-phase rectifiers or switched-mode power supplies, which a standard AC-sensitive RCD would miss. This makes it a fit for mixed-load sub-distribution boards where both sinusoidal and pulsed earth faults are possible. The 7-module width (each module being 17.5 mm on a standard DIN rail) means this RCBO occupies about 122.5 mm of rail space — a factor when laying out a crowded sub-distribution board. The 4-pole configuration (3 phases + neutral) suits three-phase final circuits where neutral switching and protection are required. The D-curve magnetic release typically holds up to 10–20× rated current for short durations, so verify the connected load's inrush profile against that window to avoid nuisance tripping on motor start.","metaTitle":"Siemens 5SU1344-8RC40 RCBO 40 A 4-pole D Type A 30mA","metaDescription":"Siemens 5SU1344-8RC40 RCBO, 40 A, 4-pole, 7 modules, D characteristic, Type A 30 mA. Current lifecycle stage. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6e2e6ddacb60a42cb10c149ae3a30b8e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=374315&mlfb=5SU1344-8RC40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1344-8RC40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SU1344-8RC40 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quote — submit an RFQ for a firm price and lead time."},{"question":"What does the D characteristic and Type A 30 mA mean on this RCBO?","answer":"The D characteristic provides a magnetic trip curve suited for high-inrush loads like motors and transformers. Type A 30 mA residual current detection handles both sinusoidal AC and pulsating DC fault currents, covering modern electronic loads that an AC-only RCD would not detect."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1344-8RC40","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/5SU1344-8RC40 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}}