{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7306-8MA","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7306-8MA","canonicalUrl":"https://aoctrl.com/siemens/5SY7306-8MA","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7306-8MA","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7306-8MA, 3-pole miniature circuit breaker, D tripping characteristic, 30 kA breaking capacity at 400 V AC, IEC 60947-2.","salesMarkdown":"Its D tripping characteristic (10–20× In) makes it a natural fit for motor circuits, transformers, and other inductive loads that draw a heavy start-up surge without causing nuisance trips. The D-curve (10–20× In) is the key selection parameter here. Unlike a B-curve (3–5× In) used for resistive loads or a C-curve (5–10× In) for general-purpose circuits, the D-curve allows a wider magnetic trip window — essential for motor starting where the locked-rotor current can hit 8–12× the full-load rating. If your load is a pump, compressor, or conveyor drive, this is the characteristic that keeps the breaker from opening on every start cycle. In a panel with a transformer rating that delivers a prospective short-circuit current in that range, this MCB provides the necessary SCCR headroom. The standard itself (IEC 60947-2) covers low-voltage switchgear and controlgear — it is the governing standard for industrial MCBs, distinct from the household-focused EN 60898. The 3-pole design (3P) switches all three phases simultaneously, with no neutral pole switching. That is the standard configuration for a three-phase motor or distribution circuit where the neutral is solidly bonded and does not need overcurrent protection. The IP20 rating applies only with connected conductors — the terminals are finger-safe once wired. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) means it holds up on a machine frame or near a motor. ## Panel integration and compliance The combined terminal design at both top and bottom accepts a range of conductor sizes; the terminals are sealable, which is useful for lockout/tagout procedures. Operating voltage is AC only, 50/60 Hz, with a maximum of 440 V in single-phase or multi-phase operation. The DC rating is limited to 72 V maximum, so do not use this on a DC bus without checking the voltage.","metaTitle":"Siemens 5SY7306-8MA SENTRON MCB, 3P D-curve, 30 kA IEC 60947","metaDescription":"Siemens 5SY7306-8MA SENTRON miniature circuit breaker, 3-pole D-curve, 30 kA at 400 V AC per IEC 60947-2. Active production, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SY7306-8MA","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2","description":"Miniature circuit breakers 400v Icu 30kA 3-pole, 6 A, only magnetic","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"400 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"Only magnetic tripping operation","Combined Terminal Bottom":"Yes","Suitability For Operation":"Industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to IEC 60947-2 rated value":"30 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","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cb340a17df0b4bab793d88e2b7ee7e07.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=696508&mlfb=5SY7306-8MA"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7306-8MA","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/5SY7306-8MA when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}