{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM9646-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM9646-6","canonicalUrl":"https://aoctrl.com/siemens/5SM9646-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SM9646-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM9646-6, RC unit electronic for 5SL4, 4-pole, Type A, 63 A rated current, 300 mA residual current, 230/400 V AC, 3 kA surge current resistance, IP20, DIN rail mount.","salesMarkdown":"The Siemens 5SM9646-6 is a SENTRON residual current (RC) unit — an electronic RCD module designed to pair with a 5SL4 miniature circuit breaker. It's a 4-pole, Type A device rated for 63 A continuous current and 300 mA residual tripping current at 230/400 V AC, 50 Hz. The unit occupies 3 width units (54 mm) and has a 70 mm installation depth — same as a standard MCB, so it fits existing distribution boards without extra enclosure depth. IP20 rated with conductors connected, meaning it's protected against solid objects over 12 mm but not water ingress; mount inside a distribution board with a cover for any wet-area install. ## Wiring and terminations Terminals accept solid conductors from 0.75 mm² up to 35 mm² and stranded from 0.75 mm² to 25 mm². Tightening torque is 2.5 to 3 N·m — treat it like a standard 35 mm² terminal block. The power supply connects at the top, above the miniature circuit breaker, which is the conventional feed-side arrangement for RCBO assemblies. Silicon-free construction, which matters for potting or conformal-coating compatibility in sensitive electronics environments.","metaTitle":"Siemens 5SM9646-6 SENTRON RC Unit, Type A, 63 A, 300 mA, 4P","metaDescription":"Siemens 5SM9646-6 SENTRON RC unit electronic for 5SL4, 4-pole, Type A, 63 A rated current, 300 mA tripping residual current, 400 V AC. Active production, available to order. Quoted","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"70 mm","Solid":"0.75 ... 35 mm²","Width":"54 mm","Height":"100 mm","Stranded":"0.75 ... 25 mm²","Rated Value":"50 Hz","Mounting type":"Standard rail mounting","During Storage":"-40 ... +75 °C","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product variations":"DI unit, type A, 0.3...63 A, 4P, 300 mA","Ambient temperature":"-25 ... +55 °C","Product designation":"RC unit electronic for 5SL4","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage category":"III","Design of the product":"Instantaneous","Number of width units":"3","Type of fault current":"A","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SM9","Current / at AC / rated value":"63 A","Product feature / silicon-free":"Yes","Position / of power supply cord":"Top, above miniature circuit breaker","Supply voltage / at AC / rated value":"230/400 V","Surge current resistance / rated value":"3 kA","Switching function / short-term delayed":"No","Tripping residual current / rated value":"300 mA","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Size of installation devices / acc. to DIN 43880":"1","Supply voltage / for testing equipment / minimum":"125 V","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ed62bcd7ececd0b6000a018d2dfa2438.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629217&mlfb=5SM9646-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM9646-6/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM9646-6 and what is the lead time?","answer":"The 5SM9646-6 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 lead time."},{"question":"What does Type A mean on this residual current device?","answer":"Type A detects sinusoidal AC fault currents and pulsating DC fault currents up to 6 mA smooth DC. This covers circuits with single-phase rectifiers, switch-mode power supplies, and VFDs that produce pulsating DC leakage — the most common requirement for general industrial and commercial panel builds today."},{"question":"Will 5SM9646-6 fit in a panel designed for 5SL6563-7BB?","answer":"Not without rewiring. The 5SM9646-6 is a 4-pole RC unit (54 mm wide, 70 mm deep) that mates with a 5SL4 MCB, while the 5SL6563-7BB is a 2-pole miniature circuit breaker (36 mm wide, 76 mm deep) on its own. Different form factor, different pole count, different function — they are not drop-in interchangeable."},{"question":"What conductor sizes does the 5SM9646-6 accept?","answer":"Solid conductors from 0.75 mm² up to 35 mm², and stranded conductors from 0.75 mm² up to 25 mm². Torque terminals to 2.5–3 N·m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM9646-6","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/5SM9646-6 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}}