{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3612-0MJ20","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3612-0MJ20","canonicalUrl":"https://aoctrl.com/siemens/5SM3612-0MJ20","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3612-0MJ20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series, RCCB, 25 A, 300 mA, 230 V AC, 2-pole, DIN rail mount, IP20.","salesMarkdown":"The Siemens SENTRON 5SM3612-0MJ20 is a 2-pole residual current circuit breaker (RCCB) rated 25 A at 230 V AC, 50 Hz, with a 300 mA trip threshold and 10 kA short-circuit current rating. That's fine for general-purpose circuits feeding resistive or inductive loads like heaters, contactors, and small motors, but not for drives, UPS, or rectified loads where pulsating DC leakage would go undetected. The 300 mA trip is a fire-protection threshold, not a personnel-protection level (that's 30 mA). You'd spec this on submain or feeder circuits where the leakage from multiple loads sums above 30 mA but below 300 mA — think lighting banks, distribution boards feeding socket outlets, or fixed equipment with high capacitive leakage. Conductor range accepts 1 to 16 mm² solid or stranded, so it'll take anything from a 1.5 mm² control wire up to a 16 mm² main feed. Mounts on DIN rail (REG profile), occupies 2 width units (about 36 mm), and can be installed in any orientation. If the panel sits in a non-conditioned space that hits 50 °C in summer, you'll need to derate — but Siemens doesn't publish a derating curve for this RCCB, so keep it within the -5 to +45 °C band for full rated current.","metaTitle":"Siemens 5SM3612-0MJ20 SENTRON RCCB, 25 A, 300 mA, 2-pole","metaDescription":"Siemens SENTRON 5SM3612-0MJ20 RCCB, 25 A, 300 mA trip, 230 V AC, 10 kA SCCR, 2-pole, DIN rail. Active production, sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Solid":"1 ... 16 mm²","Stranded":"1 ... 16 mm²","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","During Storage":"-40 ... +75 °C","Number of poles":"2","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-5 ... +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":"2","Type of fault current":"AC","circuit-breaker / Design":"5SM3","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":"230 V","Switching function / short-term delayed":"No","Tripping residual current / rated value":"300 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=419054&mlfb=5SM3612-0MJ20","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3612-0MJ20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3612-0MJ20 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What conductor sizes does 5SM3612-0MJ20 accept?","answer":"It accepts 1 to 16 mm² solid or stranded conductors. The terminals are screw-type with a tightening torque of 2.5 to 3 N·m."},{"question":"Will 5SM3612-0MJ20 drop into a panel wired for 5SU9304-1KK32?","answer":"Physically yes — both are 2-pole, DIN-rail mount, 70 mm installation depth, same width (2 width units). But the 5SU9304-1KK32 is a 32 A / 30 mA device, while this one is 25 A / 300 mA. If the circuit is designed for 32 A load or requires 30 mA personnel protection, this part won't work. Check the load current and trip requirement before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3612-0MJ20","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/5SM3612-0MJ20 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}}