{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1444-8RC40","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1444-8RC40","canonicalUrl":"https://aoctrl.com/siemens/5SU1444-8RC40","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1444-8RC40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SU1444-8RC40 RCBO, 40 A, 4-pole, 7 modules, D characteristic, Type A, 100 mA residual current.","salesMarkdown":"It combines a D-characteristic MCB for high-inrush loads (motors, transformers, welding equipment) with a Type A residual current device sensitive to pulsating DC fault currents up to 100 mA. The 40 A continuous rating and D characteristic suit circuits where the load draws a high inrush — typically motor feeders, power supplies with large capacitive input filters, or industrial lighting banks. It is not suitable for pure DC fault currents (Type B required for that). The 4-pole construction (3 phases + neutral) makes it a drop-in for three-phase distribution boards where neutral protection and disconnection are mandatory per local wiring rules.","metaTitle":"Siemens 5SU1444-8RC40 RCBO, 40 A 4-pole D curve Type A 100mA","metaDescription":"Siemens 5SU1444-8RC40 RCBO, 40 A, 4-pole, D characteristic, Type A, 100 mA residual. Current lifecycle stage. Quoted to order against 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/9b68ef0a64e220049d181fe539236b90.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=11623&mlfb=5SU1444-8RC40","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1444-8RC40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SU1444-8RC40 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What does the D characteristic mean on this RCBO?","answer":"The D characteristic means the magnetic trip threshold is 10–20 times the rated current (400–800 A for this 40 A unit), so it withstands high inrush from motors, transformers, or capacitive loads without nuisance tripping."},{"question":"What is the residual current rating and type?","answer":"It is a Type A RCD rated at 100 mA, sensitive to sinusoidal AC and pulsating DC residual currents up to that threshold."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1444-8RC40","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/5SU1444-8RC40 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}}