{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3312-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3312-0","canonicalUrl":"https://aoctrl.com/siemens/5SM3312-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3312-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCCB, 2-pole, 25 A at 40 °C, 30 mA trip, 10 kA SCCR, 230 V AC, 50 Hz, DIN rail mount, IP20.","salesMarkdown":"## What it is and what the ratings mean The Siemens SENTRON 5SM3312-0 is a 2-pole residual current circuit breaker (RCCB) rated 25 A at 40 °C with a 30 mA trip threshold, designed for AC residual current detection. The 30 mA trip is the standard for personal protection against direct contact in residential and commercial final circuits — it catches leakage through the human body before fibrillation risk. The 10 kA short-circuit current rating (SCCR) means the device can safely interrupt a fault up to 10 kA at the rated voltage without welding contacts or rupturing the enclosure; that's the figure the panel designer uses for fault coordination with the upstream overcurrent device. Rated supply voltage is 230 V AC at 50 Hz, which covers standard single-phase residential and light commercial mains in Europe and many other regions. The instantaneous design (no intentional delay) trips within milliseconds of the residual current exceeding 30 mA — no time grading for selectivity, so it's the last device in the chain, not a delayed S-type for feeder protection. ## Mounting and integration Snaps onto DIN rail (REG) and occupies 2 modular width units (36 mm total). Depth is 70 mm, which matches the standard 70 mm installation depth for SENTRON distribution boards — no extra clearance needed behind the panel door. Mounting position is any orientation, so it fits in tight enclosures where vertical or horizontal rail placement is forced. The IP20 rating applies only when the distribution board is installed with connected conductors; treat it as protected-finger-safe inside a closed panel, not for wet or dusty environments. Supply cord can enter from top or bottom — no forced orientation for line/load. Silicon-free construction matters if the panel is in a painting or coating line where silicone outgassing causes adhesion defects.","metaTitle":"Siemens SENTRON 5SM3312-0 RCCB, 2-pole, 25 A, 30 mA, 10 kA","metaDescription":"Siemens SENTRON 5SM3312-0 RCCB, 2-pole, 25 A rated, 30 mA trip, 10 kA SCCR, 230 V AC, 50 Hz. Current lifecycle stage. 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":"70 mm","Width":"36 mm","Height":"90 mm","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":"70 mm","Product Brand Name":"SENTRON","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Operating Frequency":"50 Hz","Product Designation":"RCCB","acc. to IEC 81346-2":"F","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","acc. to DIN EN 61346-2":"F","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","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":"$346.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=91305&mlfb=5SM3312-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3312-0/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SM3312-0 used for?","answer":"It is a 2-pole RCCB for AC residual current protection in 230 V AC, 50 Hz circuits, rated 25 A with a 30 mA trip threshold. Typical use is personal protection in final subcircuits of residential or commercial distribution boards."},{"question":"What are the key ratings of 5SM3312-0?","answer":"25 A at 40 °C, 30 mA residual trip current, 10 kA SCCR, 230 V AC, 50 Hz, 2 poles, instantaneous trip characteristic."},{"question":"Where can I buy 5SM3312-0?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will 5SM3312-0 drop into a panel that was specified around 5SU9304-1KK32 without rewiring?","answer":"Both are 2-pole RCCBs on DIN rail with 2 MW width, so the mechanical fit is the same. But the 5SU9304-1KK32 is a different series with potentially different trip characteristics or auxiliary contact options — verify the residual current type and time delay match your circuit design before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3312-0","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/5SM3312-0 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}}