{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3346-0LA","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3346-0LA","canonicalUrl":"https://aoctrl.com/siemens/5SM3346-0LA","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3346-0LA","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series, RCCB, 4-pole, Type AC, 63 A, 30 mA, 400 V AC, with thermal overload protection, DIN rail mount.","salesMarkdown":"## Siemens SENTRON 5SM3346-0LA — 4-pole RCCB, 63 A, 30 mA, Type AC The Siemens SENTRON 5SM3346-0LA is a 4-pole residual current operated circuit breaker (RCCB) rated at 63 A with a 30 mA tripping residual current, designed for 400 V AC systems at 50 Hz. The 30 mA sensitivity provides personal protection against direct contact, while the 63 A rating handles the full load current of a large submain or a group of downstream circuits. Rated at 63 A and 400 V AC, this RCCB is sized for a three-phase four-wire sub-distribution board. With thermal overload protection built in, the 5SM3346-0LA combines residual current detection with overcurrent sensing in a single unit — it will trip on sustained overload as well as on earth fault, reducing the number of devices needed in the panel. The 30 mA residual current setting is the standard threshold for personal protection against electric shock (IEC 60364-4-41), making this unit appropriate for final circuits supplying socket outlets or portable equipment where direct contact risk exists. Mounts on DIN rail (REG) and occupies 4 width units of panel space. Screw-type terminals accept solid or stranded conductors from 1.5 mm² up to 25 mm², with a recommended tightening torque of 2.5 to 3 N·m — enough for the 63 A rated current without oversizing the terminal. Installation depth is 70 mm, matching the standard depth of modular DIN-rail devices, so it sits flush with adjacent breakers and contactors. Silicon-free construction matters for applications where silicone outgassing can contaminate sensitive surfaces, such as in paint shops or electronics assembly areas. It is part of the Siemens SENTRON 5SM3 series of RCCBs, which are widely specified in European-standard distribution boards and are available through standard industrial distribution channels.","metaTitle":"Siemens SENTRON 5SM3346-0LA RCCB, 4P, 63A, 30mA, Type AC","metaDescription":"Siemens SENTRON 5SM3346-0LA 4-pole RCCB, 63 A rated current, 30 mA residual current, Type AC, 400 V AC, 10 kA SCCR. 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":{"Solid":"1.5 ... 25 mm²","Stranded":"1.5 ... 25 mm²","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":"70 mm","Product brand name":"SENTRON","Product variations":"With thermal overload protection","Ambient temperature":"-40 ... +75 °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","circuit-breaker / Design":"5SM3","Short-circuit current rating":"10 kA","Current / at AC / rated value":"63 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":"30 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":"195 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=29809&mlfb=5SM3346-0LA","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3346-0LA/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of 5SM3346-0LA?","answer":"It is a 4-pole Type AC RCCB rated at 63 A, 30 mA residual current, 400 V AC, 50 Hz, with a 10 kA short-circuit current rating and built-in thermal overload protection."},{"question":"What conductor sizes does 5SM3346-0LA accept?","answer":"The screw terminals accept solid or stranded conductors from 1.5 mm² up to 25 mm², with a tightening torque range of 2.5 to 3 N·m."},{"question":"Will 5SM3346-0LA drop into a panel specified around 5SY4304-7CV?","answer":"No — 5SY4304-7CV is a 3-pole MCB (miniature circuit breaker) with a 3-module width, while 5SM3346-0LA is a 4-pole RCCB occupying 4 width units. They serve different protection functions (overcurrent vs. residual current) and have different pole counts and footprints, so they are not direct drop-in replacements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3346-0LA","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/5SM3346-0LA 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}}