{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3646-5BG","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3646-5BG","canonicalUrl":"https://aoctrl.com/siemens/5SM3646-5BG","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3646-5BG","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SM3646-5BG, residual current operated circuit breaker, 4-pole, type B, selective, In: 63 A, 300 mA, Un AC: 400 V.","salesMarkdown":"The Siemens 5SM3646-5BG is a 4-pole residual current operated circuit breaker (RCCB), type B, selective, rated 63 A with a 300 mA earth-leakage trip threshold on a 400 V AC supply. Type B detection means it catches AC, pulsating DC, and smooth DC fault currents — essential on circuits with VFDs, UPS feeds, or EV chargers that can generate DC leakage a standard AC/type A device would miss. The selective (S-type) characteristic introduces a deliberate time delay so the downstream RCCB trips first on a fault, keeping this unit as the back-up and avoiding a whole-panel blackout on a branch fault. This is a DIN-rail mounted unit, 4-pole, so it occupies four modular spaces in the distribution board. The 63 A rating suits it as a main incoming RCCB on a sub-distribution board or as a feeder protecting downstream circuits. The 300 mA threshold is typical for fire protection or selective coordination — not for personal shock protection (30 mA is the standard for that).","metaTitle":"Siemens 5SM3646-5BG RCCB, Type B, Selective, 63A, 300mA, 400","metaDescription":"Siemens 5SM3646-5BG residual current circuit breaker, 4-pole, type B, selective, 63 A, 300 mA, 400 V AC. Current lifecycle stage. 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":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1357584&mlfb=5SM3646-5BG","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3646-5BG/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SM3646-5BG used for?","answer":"It is a 4-pole residual current circuit breaker, type B selective, rated 63 A and 300 mA on a 400 V AC supply, used to detect AC, pulsating DC, and smooth DC earth faults with a time delay for selective coordination."},{"question":"How do I get pricing and availability for the 5SM3646-5BG?","answer":"Submit an RFQ for the 5SM3646-5BG; availability and current pricing are confirmed at quote time through independent distribution channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3646-5BG","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/5SM3646-5BG 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}}