{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3746-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3746-0","canonicalUrl":"https://aoctrl.com/siemens/5SM3746-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3746-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series, 5SM3746-0, 4-pole RCCB, type AC, In 63 A, IΔn 500 mA, Un 400 V AC, 10 kA, DIN rail mount, IP20.","salesMarkdown":"This is a type AC device — it detects sinusoidal AC residual currents only, not pulsating DC or smooth DC faults, so it is suited for standard resistive and inductive AC loads where no electronic rectification is present. Snaps onto DIN rail (REG), occupies 4 width units (72 mm wide), and accepts conductors from 1.5 mm² up to 25 mm² solid or stranded. IP20 with conductors connected — standard for enclosed distribution boards. The 500 mA trip threshold is higher than the common 30 mA or 100 mA RCCBs used for personnel protection. This 500 mA unit is intended for equipment protection or fire prevention on circuits with high natural leakage — think large industrial loads, heaters, or long cable runs where a 30 mA device would nuisance-trip.","metaTitle":"Siemens 5SM3746-0 SENTRON RCCB, 4P, 63 A, 500 mA, 400 V AC","metaDescription":"Siemens 5SM3746-0 SENTRON 4-pole RCCB, type AC, 63 A rated current, 500 mA trip, 400 V AC, 10 kA SCCR. DIN rail mount, IP20. Current lifecycle. Sourced to order.","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","Ambient temperature":"-5 ... +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":"AC","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","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":"$56.01","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=204324&mlfb=5SM3746-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3746-0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SM3746-0?","answer":"The 5SM3746-0 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the 5SM3746-0 used for?","answer":"It is a 4-pole residual current circuit breaker (RCCB) for AC fault protection in industrial distribution boards, rated 63 A, 400 V, 500 mA trip, type AC."},{"question":"What is the difference between the 5SM3746-0 and the 5SY4304-7CV?","answer":"The 5SY4304-7CV is a 3-pole MCB (miniature circuit breaker) with a C-curve trip characteristic and 15 kA breaking capacity, while the 5SM3746-0 is a 4-pole RCCB for earth leakage protection. They serve different protection functions — one guards against overcurrent/short-circuit, the other against residual current. They are not direct substitutes."},{"question":"What is the depth of the 5SM3746-0?","answer":"The overall depth is 77 mm, with an installation depth of 70 mm."},{"question":"What conductor sizes does the 5SM3746-0 accept?","answer":"It accepts solid and stranded conductors from 1.5 mm² up to 25 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3746-0","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/5SM3746-0 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}}