{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM1646-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM1646-0","canonicalUrl":"https://aoctrl.com/siemens/5SM1646-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM1646-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM1 series RCCB, 4-pole, type AC, In: 63 A, 300 mA, Un AC: 400 V, instantaneous, DIN rail mount.","salesMarkdown":"The Siemens 5SM1646-0 is a SENTRON 5SM1 series residual current circuit breaker (RCCB), 4-pole, type AC, rated 63 A at 400 V AC with a 300 mA residual trip threshold. It's an instantaneous device — no intentional delay — so it clears ground faults as fast as the waveform allows, which matters for personnel protection in circuits feeding portable tools or wet-area outlets where you need fast interruption. Mounts on DIN rail (REG), any orientation, with a 55 mm installation depth and 4 width units. That's a standard 4-module footprint — drops into any SENTRON distribution board or generic enclosure that accepts DIN-rail devices. IP20 with conductors connected and the distribution board installed; finger and back-of-hand safe per the protection class. For a 63 A RCCB in a typical sub-distribution board, 10 kA is adequate for most industrial and commercial installations where the upstream breaker or fuse limits prospective fault current. Thermal derating is published: holds 63 A up to 45 °C ambient, then steps down to 60.48 A at 50 °C, 57.96 A at 55 °C, 55.44 A at 60 °C, 52.92 A at 65 °C, and 50.4 A at 70 °C. Mechanical endurance is 10,000 switching cycles typical — not a daily-switch device, but fine for backup isolation and infrequent manual testing.","metaTitle":"Siemens 5SM1646-0 SENTRON RCCB, 4P, 63 A, 300 mA, 400 V AC","metaDescription":"Siemens 5SM1646-0 SENTRON RCCB, 4-pole, type AC, 63 A rated current, 300 mA residual, 400 V AC, 10 kA SCCR. Current production. 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":{"Maximum":"45 °C","Minimum":"-5 °C","at 40 Cel":"63 A","at 45 Cel":"63 A","at 50 Cel":"60.48 A","at 55 Cel":"57.96 A","at 60 Cel":"55.44 A","at 65 Cel":"52.92 A","at 70 Cel":"50.4 A","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"55 mm","Product brand name":"SENTRON","Maximum Permissible":"60 °C","Minimum Permissible":"-40 °C","Operating frequency":"50Hz","Product designation":"RCCB","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Design of the product":"Instantaneous","Number of width units":"4","Type of fault current":"AC","I2t-value / permissible":"70 000 A²·s","circuit-breaker / Design":"5SM1","Short-circuit current rating":"10 kA","Current / at AC / rated value":"63 A","Product feature / silicon-free":"Yes","For Testing Equipment / Minimum":"100 V","Position / of power supply cord":"top or bottom","Protection against electrical shock":"Finger and back-of-hand safe","Switching function / short-term delayed":"No","Tripping residual current / rated value":"300 mA","Size of installation devices / acc. to DIN 43880":"1","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$49.68","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=440269&mlfb=5SM1646-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM1646-0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of the 5SM1646-0?","answer":"4-pole, type AC RCCB rated 63 A at 400 V AC, 300 mA residual trip current, instantaneous, 10 kA SCCR. Thermal derating applies above 45 °C."},{"question":"Where can I buy the 5SM1646-0?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability; confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM1646-0","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/5SM1646-0 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}}