{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6340-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6340-6","canonicalUrl":"https://aoctrl.com/siemens/5SJ6340-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6340-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6 miniature circuit breaker, 3-pole, B characteristic, 40 A, 6 kA breaking capacity per EN 60898 and IEC 60947-2, 400 V AC, 70 mm installation depth.","salesMarkdown":"## What this 5SJ6340-6 is and what the ratings mean for fit The Siemens 5SJ6340-6 is a SENTRON 5SJ6 miniature circuit breaker — a 3-pole, 40 A, B-curve device rated for 400 V AC with a 6 kA breaking capacity certified to both EN 60898 and IEC 60947-2. The B tripping characteristic means the magnetic trip operates at 3 to 5 times rated current, so it's sized for resistive and general-purpose loads where inrush is modest — lighting circuits, control transformers, heater banks — not motor starting where a C or D curve would be needed to avoid nuisance trips on the inrush. The 6 kA breaking capacity at 400 V tells you it can safely interrupt a fault current up to that level without welding contacts or cascading failure upstream, which is the standard rating for most commercial and light industrial distribution boards. The 40 A rating is the continuous current it carries without tripping in a 30 °C ambient; the thermal-magnetic element tracks the load curve through the B band. The 5SJ6 design uses a 70 mm installation depth and mounts on standard DIN rail in any position — no orientation restrictions for the thermal trip. It occupies 3 width units (roughly 54 mm of rail space). The IP20 rating with connected conductors means it's protected against finger contact but not against moisture ingress; it belongs inside a panel or enclosure, not in a washdown zone. ## Sourcing and lifecycle — what to expect when ordering The 5SJ6 series is a mature, widely deployed platform. Compliance documentation — including RoHS, REACH, and the relevant IEC/EN standards — is provided with the part. The 5SJ6340-6 carries approvals per EN 60898 and IEC 60947-2, which cover the majority of European and international installation codes. ## Terminal capacity and wiring The screw terminals accept solid conductors from 0.75 mm² up to 25 mm² and stranded conductors across the same range. That 25 mm² upper limit is generous for a 40 A breaker — it lets you land the full-size feeder cable without a ferrule or reducer, which simplifies panel wiring when the breaker feeds a sub-distribution board or a high-current load. The terminals are sealable, meaning the manufacturer provides a means to lock or seal the terminal screws after torquing, which is a requirement in some metering or utility applications to prevent tampering. The breaker is halogen-free and silicon-free throughout its construction — relevant if the panel is installed in a clean-room environment or a zone where outgassing from a fault could contaminate optics or electronics.","metaTitle":"Siemens 5SJ6340-6 SENTRON MCB, 3-Pole, B Curve, 40 A, 6 kA","metaDescription":"Siemens 5SJ6340-6 SENTRON miniature circuit breaker, 3-pole, B tripping characteristic, 40 A rated current, 6 kA breaking capacity per EN 60898/IEC 60947-2. Sourced to order agains","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Solid":"0.75 ... 25 mm²","Sealable":"Yes","Stranded":"0.75 ... 25 mm²","Rated Value":"50 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"3","Type of voltage":"AC/DC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-20 ... +45 °C","Product designation":"Miniature circuit breakers","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"Miniature circuit breaker 5SJ6","Energy limiting class":"3","Number of width units":"3","Number of poles / Note":"3","circuit-breaker / Design":"5SJ6","Current / at AC / rated value":"40 A","Tripping characteristic class":"B","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"6 kA","Product feature / Touch protection":"Yes","Supply voltage / at AC / rated value":"400 V","Influence of the surrounding temperature":"Periodically +55°C, max. 95% humidity","Insulation voltage / at AC / rated value":"440 V","Vibration resistance / acc. to IEC 60068-2-6":"50m/s² at 25 to 150Hz and 60m/s² at 10 to 150 Hz","with multi-phase operation / at AC / maximum":"440 V","Mechanical service life (switching cycles) / typical":"20 000"}},"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=524857&mlfb=5SJ6340-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ6340-6/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SJ6340-6 and how is it quoted?","answer":"The 5SJ6340-6 is sourced 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":"Will the 5SJ6340-6 fit in a panel designed for the 5SJ6220-6?","answer":"The 5SJ6340-6 occupies 3 width units versus the 5SJ6220-6's 2 width units, so it needs one additional module space on the DIN rail. Both share the same 70 mm installation depth and mounting position flexibility, so the panel depth and rail are compatible, but the width allocation must be checked."},{"question":"What compliance documentation does Siemens provide for the 5SJ6340-6?","answer":"The 5SJ6340-6 is certified to EN 60898 and IEC 60947-2 for breaking capacity. It is halogen-free and silicon-free. Standard RoHS and REACH declarations are provided with the product documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6340-6","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/5SJ6340-6 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}}