{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1344-2RC40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1344-2RC40","canonicalUrl":"https://aoctrl.com/siemens/5SU1344-2RC40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1344-2RC40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SU1 RCBO, 40 A, 4-pole, 8 modules, D characteristic, Type AC, 30 mA residual current.","salesMarkdown":"The 8-module width (roughly 144 mm on a standard DIN-rail grid) determines the enclosure space required. In a panel with multiple RCBOs, the cumulative width drives the rail length and cabinet depth. The 30 mA Type AC residual sensitivity covers sinusoidal AC fault currents; for pulsating DC or smooth DC fault types, a Type A or F device would be required instead. The 40 A rating at 4 poles means this RCBO protects all three phases plus neutral in a single unit. For a 230/400 V three-phase supply, it handles line currents up to 40 A per phase while providing earth leakage protection on the same physical package. This consolidates what would otherwise require a separate MCB and RCCD, saving one DIN position compared to two discrete devices.","metaTitle":"Siemens 5SU1344-2RC40 RCBO, 40A 4P D Curve 30mA","metaDescription":"Siemens 5SU1344-2RC40 RCBO: 40 A, 4-pole, D characteristic, 30 mA Type AC. Current production. Sourced to order.","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=469725&mlfb=5SU1344-2RC40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1344-2RC40/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SU1344-2RC40 used for?","answer":"It is a 4-pole RCBO rated at 40 A with a D tripping characteristic and 30 mA Type AC residual current protection, used to combine overcurrent and earth leakage protection in a single DIN-rail device for three-phase circuits with high inrush loads."},{"question":"Where can I buy the 5SU1344-2RC40?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"What does the D characteristic mean on this RCBO?","answer":"The D characteristic means the magnetic trip operates at 10 to 20 times the rated current (400–800 A for this 40 A unit), making it suitable for circuits with high inrush currents such as motor starters, transformers, or welding equipment where a B or C curve would cause nuisance tripping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1344-2RC40","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/5SU1344-2RC40 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}}