{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3744-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3744-6","canonicalUrl":"https://aoctrl.com/siemens/5SM3744-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3744-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, 40 A, 500 mA, Type A, 400 V AC, DIN rail mount.","salesMarkdown":"## RCCB for 400 V AC, 4-pole, 40 A, Type A The Siemens 5SM3744-6 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON 5SM3 series, rated 40 A at 400 V AC, with a 500 mA tripping residual current and Type A fault-current sensitivity. Type A detection means it responds to AC sinusoidal residual currents and pulsating DC residual currents — the standard choice for circuits with single-phase rectifiers, switching power supplies, or electronic loads that generate pulsed DC fault currents. The 40 A rating holds at ambient up to 45 °C. Above that, derate 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. ## Installation and wiring Snaps onto standard DIN rail, any mounting position.","metaTitle":"Siemens 5SM3744-6 SENTRON RCCB, 4-pole 40 A 500 mA Type A","metaDescription":"Siemens SENTRON 5SM3744-6 RCCB, 4-pole, 40 A rated at 400 V AC, 500 mA residual current, Type A. Quoted 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","Solid":"1.5 ... 25 mm²","Width":"72 mm","Height":"90 mm","Stranded":"1.5 ... 25 mm²","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)","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":"-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","I2t-value / permissible":"70 000 A²·s","circuit-breaker / Design":"5SM3","Current / at AC / rated value":"40 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=393072&mlfb=5SM3744-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3744-6/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 5SM3744-6?","answer":"The overall depth is 77 mm; the installation depth (without terminals) is 70 mm."},{"question":"What conductor sizes does 5SM3744-6 accept?","answer":"It accepts solid and stranded conductors from 1.5 mm² up to 25 mm²."},{"question":"Where can I buy 5SM3744-6 and how is it quoted?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3744-6","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/5SM3744-6 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}}