{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3746-6KL","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3746-6KL","canonicalUrl":"https://aoctrl.com/siemens/5SM3746-6KL","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3746-6KL","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, Type A, 63 A rated current, 500 mA residual trip, 400 V AC, instantaneous design, DIN rail mount, 72 mm wide.","salesMarkdown":"The 5SM3746-6KL: The 63 A rated current and 400 V AC rated voltage define the continuous load capacity — this RCCB handles a 63 A feed through a 4-pole block, which is common for a sub-distribution board or a large single-phase load group on a 3-phase system. The 500 mA residual trip threshold is not for personnel protection (that needs 30 mA or lower); it is for equipment protection or fire prevention on circuits with high natural leakage, such as long cable runs, VFD-fed motors, or industrial heaters. The Type A designation means it detects sinusoidal AC residual currents plus pulsating DC residual currents — the standard choice for most modern electronic loads that generate half-wave rectified leakage. Snaps onto DIN rail and occupies 4 width units — 72 mm wide, 90 mm tall, 77 mm deep, with an installation depth of 70 mm. That 77 mm depth means it clears most 100 mm deep enclosures, but check your gland plate clearance if the cabinet is shallow. Wire range: 1.5 to 25 mm² solid or stranded. Mounting position is any, supply can come from top or bottom.","metaTitle":"Siemens SENTRON 5SM3746-6KL RCCB, 4P Type A, 63A, 500mA","metaDescription":"Siemens SENTRON 5SM3746-6KL 4-pole RCCB, Type A, 63 A rated, 500 mA trip, 400 V AC, 10 kA SCCR. Active production. Quoted to order. DIN rail mount, 72 mm wide.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"1.5 ... 25 mm²","Width":"72 mm","Height":"90 mm","Stranded":"1.5 ... 25 mm²","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","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":"N left","Ambient temperature":"-25 ... +45 °C","Operating frequency":"50Hz","Product designation":"RCCB","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":"4","Type of fault current":"A","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SM3","Short-circuit current rating":"10 kA","Current / at AC / rated value":"63 A","Product feature / silicon-free":"Yes","Position / of power supply cord":"top or bottom","Protection against electrical shock":"Finger and back-of-hand safe","Supply voltage / at AC / rated value":"400 V","Surge current resistance / rated value":"1 kA","Switching function / short-term delayed":"No","Tripping residual current / rated value":"500 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":"100 V","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=510605&mlfb=5SM3746-6KL","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3746-6KL/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SM3746-6KL?","answer":"Submit an RFQ through the storefront. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"What is 5SM3746-6KL's physical size?","answer":"It is 72 mm wide, 90 mm tall, and 77 mm deep, occupying 4 DIN width units on a standard rail."},{"question":"What wire sizes does 5SM3746-6KL accept?","answer":"The terminals accept 1.5 to 25 mm² solid or stranded copper conductors, torqued to 2.5–3 N·m."},{"question":"What compliance documentation does Siemens provide for 5SM3746-6KL?","answer":"The product carries a silicon-free designation. Standard Siemens documentation includes the declaration of conformity and product information; specific RoHS/REACH/UL/IEC certificates are available from Siemens Industry Online Support or your Siemens contact."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3746-6KL","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/5SM3746-6KL 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}}