{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SV3644-8MJ","brand":"Siemens","brandSlug":"siemens","productSlug":"5SV3644-8MJ","canonicalUrl":"https://aoctrl.com/siemens/5SV3644-8MJ","factsUrl":"https://aoctrl.com/api/mcp/products/5SV3644-8MJ","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SV3644-8MJ, Type A residual current operated circuit breaker, 40 A, 300 mA, 10 kA, 3+N-pole, 400 V, selective, 4 MW.","salesMarkdown":"The Siemens 5SV3644-8MJ is a Type A residual current operated circuit breaker (RCCB) rated 40 A with a 300 mA trip sensitivity and 10 kA short-circuit capacity. The 3+N-pole configuration covers three-phase plus neutral on a 400 V system. The selective (S-type) designation means it delays tripping to coordinate with downstream RCCBs — useful on distribution subfeeds where you want the faulted branch to clear before the main. The 300 mA rating is a common threshold for fire protection in commercial and industrial circuits (EN 60364-4-42). It's above the 30 mA required for personnel protection, so this device guards against insulation faults and arcing that could start a fire, not against direct shock risk. The Type A waveform detection covers pulsating DC residual currents from rectifiers and switching power supplies — typical in modern panels with VFDs, UPSs, or LED drivers. Type A selective RCCBs of this rating go into distribution boards feeding mixed loads — lighting, socket outlets, small motor circuits, and electronic equipment. The selective delay (typically 40–150 ms) lets downstream 30 mA RCCBs trip first on a ground fault, keeping the main board live for the rest of the installation. Common in commercial buildings, industrial control panels, and infrastructure sub-distribution.","metaTitle":"Siemens 5SV3644-8MJ RCCB, Type A, 40A 300mA 10kA, 4P","metaDescription":"Siemens 5SV3644-8MJ residual current circuit breaker, Type A, 40 A, 300 mA, 10 kA, 3+N-pole, 400 V, selective. Active lifecycle. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"title":"5SV3644-8MJ","description":"Residual current operated circuit breaker type A, 10kA 40 A 3+N-pole 300 mA 400 V 4 MW Selective OEZ, 42474, LFN-40-4-300A-S","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ed280646498d532ac59ddeccc41d4200.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=685521&mlfb=5SV3644-8MJ"},"ai":{"faq":[{"question":"What is the 5SV3644-8MJ used for?","answer":"It's a Type A selective residual current circuit breaker for 3-phase + neutral circuits at 400 V, rated 40 A with 300 mA trip sensitivity and 10 kA breaking capacity. Used for fire protection and ground-fault coordination in distribution boards."},{"question":"Where can I buy the 5SV3644-8MJ?","answer":"This part is sourced and quoted to order against an RFQ. Current pricing and availability are confirmed at quote time through our distribution network."},{"question":"What does Type A and selective mean on this RCCB?","answer":"Type A detects pulsating DC residual currents from rectified loads (VFDs, switched-mode supplies). Selective (S-type) introduces a deliberate trip delay so a downstream RCCB clears first during a fault, keeping upstream circuits live."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SV3644-8MJ","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/5SV3644-8MJ when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}