{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM1646-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM1646-6","canonicalUrl":"https://aoctrl.com/siemens/5SM1646-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SM1646-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM1 series, RCCB, 4-pole, type A, In 63 A, IΔn 300 mA, Un AC 400 V, 10 kA SCCR, instantaneous, DIN rail.","salesMarkdown":"## What this RCCB does on your panel The Siemens 5SM1646-6 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON 5SM1 series, rated for 63 A at 400 V AC, 50 Hz. It trips instantaneously on type A fault currents (pulsating DC and sinusoidal AC) at 300 mA residual — the common choice for circuits with single-phase rectifiers, switched-mode supplies, or variable-speed drives that generate smooth DC fault components. Above that, the thermal curve drops: 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. That SCCR covers most distribution boards fed from a typical 400 V transformer up to about 200 kVA — enough for a production line sub-panel. The I²t let-through is rated 70,000 A²·s, so check coordination with the upstream MCB or fuse. Mechanical life is 10,000 switching cycles typical. That's standard for a distribution RCCB — not a switching contactor, but fine for infrequent manual test or isolation. For high-cycle applications like daily E-stop testing, budget for more frequent replacement. Snaps onto DIN rail (REG profile), 4 width units (4 x 18 mm). Mounting position is any — no orientation restriction. Installation depth is 55 mm from the rail surface. IP20 with conductors connected, so it's for enclosed distribution boards only — not for washdown or outdoor exposed mounting.","metaTitle":"Siemens 5SM1646-6 SENTRON RCCB, 4P, 63A, 300mA, Type A, 10kA","metaDescription":"Siemens SENTRON 5SM1646-6 4-pole RCCB, 63 A rated current, 300 mA residual, type A, 400 V AC, 10 kA SCCR, DIN rail mount. Currently in production. Available 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":"-25 °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":"50 Hz","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":"A","I2t-value / permissible":"70 000 A²·s","circuit-breaker / Design":"5SM1","Short-circuit current rating":"10 kA","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","Surge current resistance / rated value":"1 kA","Operating current / at AC / rated value":"63 A","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=532268&mlfb=5SM1646-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM1646-6/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SM1646-6 rated current and voltage?","answer":"Rated operating current is 63 A at 400 V AC, 50 Hz, 4-pole. The residual trip threshold is 300 mA, type A (pulsating DC and sinusoidal AC). Short-circuit rating is 10 kA."},{"question":"What ambient temperature range does the 5SM1646-6 handle?","answer":"Operating ambient is -25 °C to 45 °C without derating. Storage range is -40 °C to 60 °C. Above 45 °C ambient, the current rating derates per the thermal curve down to 50.4 A at 70 °C."},{"question":"Where can I buy the 5SM1646-6?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial response."},{"question":"Will 5SM1646-6 drop into a panel specified for 5SQ2670-2YA63?","answer":"Both are 4-pole RCCBs on DIN rail, same width (4 MW). The 5SM1646-6 is type A, 63 A, 300 mA, 10 kA. The 5SQ2670-2YA63 is a different series; verify the residual current rating and voltage match your panel design. Footprint and busbar pitch are standard, but always confirm the terminal layout against your existing wiring before ordering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM1646-6","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/5SM1646-6 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}}