{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM1742-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM1742-0","canonicalUrl":"https://aoctrl.com/siemens/5SM1742-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM1742-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM1 series RCCB, 4-pole, type AC, In 25 A, IΔn 500 mA, Un AC 400 V, 10 kA SCCR, instantaneous, DIN rail mount.","salesMarkdown":"## Thermal derating and conductor range Above that, derate linearly: 24 A at 50 °C, 23 A at 55 °C, 22 A at 60 °C, 21 A at 65 °C, and 20 A at 70 °C. Tightening torque is 2.5 to 3 N·m. ## Installation and environment Supply can enter from top or bottom, which simplifies busbar routing in a crowded enclosure. IP20 rating applies when installed in a distribution board with connected conductors; the device itself is finger and back-of-hand safe per the shock protection class. Ambient temperature range is -40 to +60 °C for storage/transport, with operating range -5 to +45 °C. Silicon-free construction (no silicone outgassing) matters if the panel also contains sensitive contacts or optics.","metaTitle":"Siemens 5SM1742-0 SENTRON RCCB, 4-pole, 25 A, 500 mA, 400 V","metaDescription":"Siemens 5SM1742-0 SENTRON RCCB, 4-pole, type AC, 25 A, 500 mA residual, 400 V, 10 kA SCCR. Active 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":{"Solid":"1.5 ... 25 mm²","Stranded":"1.5 ... 25 mm²","at 40 Cel":"25 A","at 45 Cel":"25 A","at 50 Cel":"24 A","at 55 Cel":"23 A","at 60 Cel":"22 A","at 65 Cel":"21 A","at 70 Cel":"20 A","Rated Value":"50 Hz","Wertebereich":"-5 ... +45 °C","Mounting type":"DIN rail (REG)","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"55 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +60 °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","I2t-value / permissible":"70 000 A²·s","circuit-breaker / Design":"5SM1","Short-circuit current rating":"10 kA","Current / at AC / rated value":"25 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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=202574&mlfb=5SM1742-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM1742-0/alternatives.json"},"ai":{"faq":[{"question":"What conductor sizes does 5SM1742-0 accept?","answer":"The terminals accept solid or stranded copper from 1.5 mm² up to 25 mm². Tightening torque is 2.5 to 3 N·m."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM1742-0","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/5SM1742-0 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}}