{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3646-4BG","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3646-4BG","canonicalUrl":"https://aoctrl.com/siemens/5SM3646-4BG","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3646-4BG","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SM3646-4BG, 4-pole residual current circuit breaker, type B, short-time delayed, rated 63 A, 300 mA, Un AC: 400 V.","salesMarkdown":"The Siemens 5SM3646-4BG is a 4-pole residual current operated circuit breaker (RCCB) rated 63 A with a 300 mA sensitivity, type B characteristic, short-time delayed, for 400 V AC systems. Type B detection covers AC sinusoidal, pulsating DC, and smooth DC fault currents — the full range you get from variable-speed drives, UPS rectifiers, or PV inverters. The short-time delay prevents nuisance tripping on transient ground faults that clear on their own, so it's the right choice for circuits with electronic loads that produce brief leakage spikes. Mounts on DIN rail in the distribution board alongside MCBs and other modular devices. The 4-pole width (4 modules at 18 mm each) fits standard 4-module cutouts. Type B RCCBs are physically interchangeable with type A or AC in the same enclosure — just confirm the neutral busbar arrangement for the 4-pole configuration.","metaTitle":"Siemens 5SM3646-4BG RCCB Type B, 63 A, 300 mA, 400 V","metaDescription":"Siemens 5SM3646-4BG residual current circuit breaker, 4-pole, type B, short-time delayed, 63 A, 300 mA, 400 V AC. Current 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":{"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=1357583&mlfb=5SM3646-4BG","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3646-4BG/alternatives.json"},"ai":{"faq":[{"question":"What is 5SM3646-4BG used for?","answer":"It is a 4-pole type B RCCB rated 63 A, 300 mA, 400 V AC, used for ground-fault protection in circuits with mixed AC and DC fault currents, such as those with VFDs, UPS systems, or solar inverters. The short-time delay avoids nuisance trips on transient leakage."},{"question":"Where can I buy 5SM3646-4BG?","answer":"We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3646-4BG","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/5SM3646-4BG 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}}