{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM1312-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM1312-0","canonicalUrl":"https://aoctrl.com/siemens/5SM1312-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM1312-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCCB, 2-pole, Type AC, 25 A at 40 °C, 30 mA trip, 10 kA SCCR, DIN rail mount.","salesMarkdown":"The Siemens SENTRON 5SM1312-0 is a 2-pole residual current circuit breaker (RCCB) rated for 25 A at 40 °C with a 30 mA trip threshold, Type AC waveform detection. It's the kind of part you spec into a distribution board when you need basic earth-leakage protection on a single-phase 230 V AC circuit — no delayed switching, no DC-sensitive electronics inside, just a straight instantaneous trip on sinusoidal AC fault currents. The 10 kA short-circuit current rating (SCCR) means it can handle a hard fault upstream without welding its own contacts shut. ## Temperature derating and mounting Rated current holds at 25 A up to 45 °C ambient, then derates linearly — 23.5 A at 50 °C, 22 A at 55 °C, 20.5 A at 60 °C, 19 A at 65 °C, and 17.5 A at 70 °C. Mounting is DIN rail (REG), any orientation, with top or bottom feed — no need to rework the busbar layout when swapping an older unit. The 55 mm installation depth fits standard 2-module-width enclosures. ## Coordination and compliance Back-up protection: the RCCB is rated for 0.5 kA withstand per EN 60898 and IEC 61008-1, so it needs an upstream MCB or fuse rated at or below that to clear a fault without damaging the RCCB. The I²t let-through is 70 000 A²·s; the let-through current peaks at 7 500 A. Overvoltage category III — suitable for fixed-installation distribution boards. IP20 with conductors connected, finger and back-of-hand touch-safe. Silicon-free construction, which matters if the panel shares space with potting or conformal-coating processes.","metaTitle":"Siemens SENTRON 5SM1312-0 RCCB, 2-Pole, 25A, 30mA, Type AC","metaDescription":"Siemens SENTRON 5SM1312-0 RCCB, 2-pole, 25A rated, 30mA trip, Type AC, 10kA SCCR. DIN rail mount, IP20. Current production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Maximum":"45 °C","Minimum":"-5 °C","Rated Value":"50 Hz","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"DIN rail (REG)","Mounting Position":"any","Installation Depth":"55 mm","Product Brand Name":"SENTRON","Maximum Permissible":"60 °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","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Residual Current Type":"AC","I2t value / permissible":"70 000 A²·s","at 40 °C / rated value":"25 A","at 45 °C / rated value":"25 A","at 50 °C / rated value":"23.5 A","at 55 °C / rated value":"22 A","at 60 °C / rated value":"20.5 A","at 65 °C / rated value":"19 A","at 70 °C / rated value":"17.5 A","Short-Circuit Current Rating":"10 kA","Number Of Modular Width Units":"2","Product Feature / Silicon-Free":"Yes","acc. to EN 60898 / rated value":"0.5 kA","Position / Of Power Supply Cord":"top or bottom","Let-Through Current / Permissible":"7 500 kA","Tripping Fault Current / Rated Value":"30 mA","supply voltage / at AC / rated value":"230 V","according to IEC 61008-1 / rated value":"0.5 kA","Switching Function / Short-Term Delayed":"No","Touch Protection Against Electrical Shock":"Finger and back-of-hand safe","operational current / at AC / rated value":"25 A","Supply Voltage / For Testing Equipment / Minimum":"100 V","size of installation devices / acc. to DIN 43880":"1","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$261.86","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=307966&mlfb=5SM1312-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM1312-0/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SM1312-0's maximum ambient temperature rating?","answer":"The maximum ambient temperature for operation is 45 °C, with a permissible storage maximum of 60 °C."},{"question":"What is the 5SM1312-0's minimum ambient temperature rating?","answer":"The minimum ambient temperature for operation is -5 °C, with a permissible storage minimum of -40 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM1312-0","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/5SM1312-0 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}}