{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3744-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3744-0","canonicalUrl":"https://aoctrl.com/siemens/5SM3744-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3744-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 5SM3744-0, 4-pole, type AC, 40 A rated at 40 °C, 400 V AC, 10 kA SCCR, DIN rail mount.","salesMarkdown":"The Siemens 5SM3744-0 is a SENTRON 5SM3-series residual current circuit breaker (RCCB) — four-pole, type AC, rated 40 A at 40 °C and 400 V AC. The 4-pole design makes it a fit for three-phase plus neutral applications where you need earth-leakage protection on all live conductors. Above that, it derates linearly: 38.4 A at 50 °C, 36.8 A at 55 °C, 35.2 A at 60 °C, 33.6 A at 65 °C, and 32 A at 70 °C. Snaps onto DIN rail (REG profile). The 77 mm overall depth includes the front projection.","metaTitle":"Siemens 5SM3744-0 SENTRON RCCB, 40 A, 400 V, 4-Pole, 10 kA","metaDescription":"Siemens 5SM3744-0 SENTRON RCCB, 40 A rated at 40 °C, 400 V AC, 4-pole, type 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":{"Depth":"77 mm","Width":"72 mm","Height":"90 mm","Maximum":"45 °C","Minimum":"-5 °C","at 40 Cel":"40 A","at 45 Cel":"40 A","at 50 Cel":"38.4 A","at 55 Cel":"36.8 A","at 60 Cel":"35.2 A","at 65 Cel":"33.6 A","at 70 Cel":"32 A","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Maximum Permissible":"75 °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":"AC","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","I2t-value / permissible":"70 000 A²·s","circuit-breaker / Design":"5SM3","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","Operating current / at AC / rated value":"40 A","Switching function / short-term delayed":"No","Tripping residual current / rated value":"500 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=90487&mlfb=5SM3744-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3744-0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3744-0 and how do I get a price?","answer":"Sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at that time."},{"question":"What is 5SM3744-0's listed depth (77 mm) on this component line?","answer":"The overall depth is 77 mm; installation depth behind the panel face is 70 mm."},{"question":"What is 5SM3744-0's listed width (72 mm) on this component line?","answer":"Width is 72 mm, which corresponds to 4 standard DIN-rail width units."},{"question":"Will 5SM3744-0 drop into a panel that was specified around 5SU9354-7KK16 without rewiring?","answer":"Both are 4-pole RCCBs on DIN rail, but the 5SU9354-7KK16 is a different series with its own terminal layout and depth. Physical fit is not guaranteed without checking the mounting footprint and connection scheme against your panel's wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3744-0","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/5SM3744-0 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}}