{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4214-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4214-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4214-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4214-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4214-8, 2-pole miniature circuit breaker, D tripping characteristic, 0.3 A rated current, 10 kA (EN 60898) / 35 kA (IEC 60947-2) breaking capacity, 2 MW width, IP20.","salesMarkdown":"## D curve at 0.3 A — what that means for the circuit The 5SY4214-8: The D curve means the magnetic trip is set to 10–20 times In (3–6 A), so it handles the high inrush of a small transformer, solenoid valve, or motor starter without nuisance tripping — that is the whole point of the D curve on a 0.3 A frame. The UL1077 listing widens the regulatory acceptance for North American machine builders. ## Panel fit — DIN rail space and thermal derating Depth is 76 mm from the rail surface; the installation depth is 70 mm. The breaker mounts in any position and accepts supply from either end — top or bottom feed, no restriction. The combined terminal top/bottom means the same clamp accepts both the line and load conductor. In a sealed enclosure with a 55 °C internal ambient, the effective continuous current is 0.25 A — the D curve still holds, but the thermal element runs hotter. The surrounding humidity limits are 95 % up to 55 °C, 55 % up to 70 °C, and 35 % at the max 75 °C. ## Sourcing and lifecycle — current production Lifecycle stage is marked as current — this is an active-production part from Siemens, not a phase-out or end-of-life line. If the BOM requires a 2-pole D-curve 0.3 A MCB, this is the direct fit.","metaTitle":"Siemens 5SY4214-8 SENTRON 2-Pole MCB, D Curve 0.3 A","metaDescription":"Siemens 5SY4214-8 SENTRON 2-pole MCB, D tripping curve, 0.3 A rated current. 10 kA per EN 60898, 35 kA per IEC 60947-2. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"0.3 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","according to EN 61346-2":"F","at 35 °C / rated value":"0.3 A","at 40 °C / rated value":"0.28 A","at 45 °C / rated value":"0.27 A","at 50 °C / rated value":"0.26 A","at 55 °C / rated value":"0.25 A","at 60 °C / rated value":"0.24 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"10 kA","according to IEC 60947-2 / rated value":"35 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage / Of The Operating Voltage":"AC","at DC / according to IEC 60947-2 / rated value":"15 kA","Product Component / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$27.94","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=324041&mlfb=5SY4214-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4214-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the Siemens 5SY4214-8?","answer":"The 5SY4214-8 is available to order against an RFQ."},{"question":"What is the difference between the 5SY4214-8 and a C-curve version?","answer":"The 5SY4214-8 uses a D tripping characteristic (magnetic trip at 10–20× In), while a C-curve version trips at 5–10× In. For a 0.3 A breaker, the D curve is selected when the load has a high inrush — small transformers, solenoid valves, or motor starters — that would nuisance-trip a C curve."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4214-8","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/5SY4214-8 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}}