{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM1744-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM1744-6","canonicalUrl":"https://aoctrl.com/siemens/5SM1744-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SM1744-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM1 series RCCB, 4-pole, type A, In 40 A, IΔn 500 mA, Un AC 400 V, 10 kA SCCR, instantaneous, DIN rail mount.","salesMarkdown":"The Siemens SENTRON 5SM1744-6 is a 4-pole residual current operated circuit breaker (RCCB), type A, rated 40 A at 400 V AC with a 500 mA tripping residual current. It's an instantaneous design — no intentional delay — so it clears earth faults as fast as the fault current drives it past the 500 mA threshold. That makes it a fit for general-purpose protection where you need fast disconnection on a 4-wire (3-phase + neutral) circuit. The 40 A rating holds across the 40 °C to 45 °C band without derating — still 40 A at both temperatures. Above that it steps down: 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. If your enclosure runs hot, that's the curve you size against, not the nameplate 40 A. That's the standard choice for mixed-load panels where you can't guarantee a clean sine-wave fault. ## DIN-rail fit and panel integration Snaps onto a DIN rail (REG profile), occupies 4 width units, and the installation depth is 55 mm. Conductor range is 1.5 mm² minimum to 25 mm² maximum. IP20 rating applies with the distribution board closed and conductors connected — standard for enclosed panel gear. Finger and back-of-hand safe touch protection is built in, so an opened enclosure still offers basic shock protection as long as the conductors are terminated.","metaTitle":"Siemens 5SM1744-6 SENTRON RCCB, 4P, 40A, 500mA, Type A, 10kA","metaDescription":"Siemens SENTRON 5SM1744-6 RCCB, 4-pole, 40A rated, 500mA residual, Type A, 10kA SCCR, 400V AC. Current lifecycle. 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":{"Maximum":"25 mm²","Minimum":"1.5 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)","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"55 mm","Product brand name":"SENTRON","Operating frequency":"50Hz","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","Current / at AC / rated value":"40 A","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","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":"$415.80","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=310154&mlfb=5SM1744-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM1744-6/alternatives.json"},"ai":{"faq":[{"question":"What is the maximum and minimum conductor size for 5SM1744-6?","answer":"The terminals accept 1.5 mm² minimum up to 25 mm² maximum conductor cross-section."},{"question":"Will 5SM1744-6 drop into a panel specified for 5SQ2670-2YA63?","answer":"Both are 4-pole SENTRON devices on a DIN-rail footprint with 55 mm installation depth and 4 width units, so the mechanical fit is the same. But 5SQ2670-2YA63 is a 63 A MCB (type C characteristic), not an RCCB — the function is different. You would need to re-engineer the protection scheme, not just swap the part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM1744-6","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/5SM1744-6 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}}