{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7204-8MA","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7204-8MA","canonicalUrl":"https://aoctrl.com/siemens/5SY7204-8MA","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7204-8MA","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7204-8MA, miniature circuit breaker, D characteristic, 2-pole, 30 kA breaking capacity per IEC 60947-2, 400 V AC, 2 MW units.","salesMarkdown":"The Siemens 5SY7204-8MA is a SENTRON miniature circuit breaker with a D tripping characteristic, designed for industrial applications where high inrush currents are expected — motor starting, transformer primaries, or welding equipment. The D curve means it tolerates short-duration surges up to 10–20 times rated current before tripping magnetically, so nuisance trips on inductive loads are less likely than with a B or C curve. Rated breaking capacity is 30 kA per IEC 60947-2 at 400 V AC, which covers most industrial distribution panels up to that fault level without needing a current-limiting upstream device. The 2-pole design switches both phase conductors; neutral is not switched. Mounts in any position on a DIN rail via the quick-assembly system. This is a magnetic-only trip unit — no thermal bimetal, so it responds purely to overcurrent magnitude, not heating. That makes it suitable for circuits where ambient temperature varies widely, since the trip point doesn't drift with heat. The -40 °C to +75 °C operating range covers unheated enclosures in cold storage or outdoor cabinets. ## Integration & Mounting Occupies 2 modular width units (36 mm) on a DIN rail. Installation depth is 70 mm; overall depth with the breaker body is 76 mm. Combined terminals at top and bottom accept incoming and outgoing conductors on the same side — handy for daisy-chaining busbars or looping through to downstream loads. Sealable for lockout/tagout compliance. Supplementary devices (auxiliary switches, shunt trips, undervoltage releases) can be installed on the side. Pollution degree 3 and overvoltage category III mean it's rated for the typical industrial panel environment — conductive dust, humidity, and transient surges from upstream switching. ## Standards & Compliance Designed and tested to IEC / EN 60947-2, the standard for low-voltage circuit breakers used in industrial applications. Halogen-free and silicon-free construction matters for clean-room or semiconductor fab environments where outgassing contaminants can't be tolerated. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.","metaTitle":"Siemens 5SY7204-8MA SENTRON MCB, D Curve, 2-Pole, 30 kA","metaDescription":"Siemens 5SY7204-8MA SENTRON miniature circuit breaker, D tripping characteristic, 2-pole, 30 kA breaking capacity per IEC 60947-2. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY7204-8MA","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2","description":"Miniature circuit breakers 400v Icu 30kA 2 pole, 4A, only magnetic","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","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":"2","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":"1.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/46cb37ac1c74e093b30081cc4443ecc5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=696493&mlfb=5SY7204-8MA"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SY7204-8MA?","answer":"30 kA per IEC 60947-2 at 400 V AC. That's the rated ultimate short-circuit breaking capacity (Icu) for this 2-pole magnetic-only MCB."},{"question":"Will the 5SY7204-8MA fit in a panel designed for the 5SY5240-7?","answer":"Both are 2-pole SENTRON MCBs in the same 36 mm (2 MW) footprint with the same DIN-rail mounting and terminal layout, so a direct mechanical swap is possible. The key difference is the tripping characteristic — verify that the D curve of the 5SY7204-8MA matches the coordination study done for the original 5SY5240-7 (which may be a different curve or rating)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7204-8MA","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/5SY7204-8MA 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}}