{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY5425-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY5425-6","canonicalUrl":"https://aoctrl.com/siemens/5SY5425-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY5425-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY5 series, miniature circuit breaker, 4-pole, 25 A, B characteristic, 10 kA (EN 60898) / 15 kA (IEC 60947-2) breaking capacity, AC 400 V / DC 880 V rated voltage.","salesMarkdown":"## Siemens 5SY5425-6 — 25 A 4-Pole B-Curve MCB for Universal-Current Circuits The Siemens 5SY5425-6 is a SENTRON 5SY5-series miniature circuit breaker rated 25 A at 400 V AC and 880 V DC, with a B tripping characteristic that trips between 3 and 5 times rated current — the standard choice for resistive and general-purpose loads where inrush is moderate. Its 4-pole (4P) construction in a 4-module-wide housing (72 mm) covers three-phase-plus-neutral or DC circuits, and the universal-current design (AC/DC rated) means it handles both supply types without derating the frame. The B-curve keeps nuisance tripping low on lighting and control transformer circuits while still clearing a hard short within the let-through energy limits of the downstream wiring. The 72 mm width (4 width units at 18 mm each) is standard for a 4-pole MCB — no surprises when laying out a multi-row distribution board. Rated for ambient temperatures from -40 °C to 75 °C, with humidity derating above 55 °C (95 % RH up to 55 °C, then 55 % RH to 70 °C, 35 % RH to 75 °C). Halogen-free and silicon-free construction suits clean-room or food-processing panels where outgassing contaminates sensitive optics or product. Pollution degree 2 (normal industrial environment, non-condensing). ## DC Application Specifics Rated DC voltage is 880 V (1-pole per string in series), with a maximum DC voltage of 1 000 V and breaking capacity of 15 kA per IEC 60947-2. The DC polarity must be observed when wiring — the supply cord position note says AC as required, but DC requires correct polarity. For a 4-pole breaker used in a bipolar DC circuit, two poles in series per polarity doubles the voltage withstand and arc-quenching margin.","metaTitle":"Siemens 5SY5425-6 SENTRON MCB, 25 A, 4-Pole, B-Curve","metaDescription":"Siemens 5SY5425-6 SENTRON miniature circuit breaker, 25 A rated, 4-pole, B tripping characteristic, 10 kA breaking capacity per EN 60898. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY5425-6","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Rated Value":"50/60 Hz","description":"Circuit breaker Universal current 880 V DC 400 V AC 10kA, 4-pole, B, 25A max. 1000 V DC","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","Number of poles":"4","Type of voltage":"AC/DC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Degree of pollution":"2","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","at DC / rated value":"880 V","Overvoltage category":"II","Combined Terminal Top":"Yes","Energy limiting class":"3","Number of width units":"4","Number of poles / Note":"4P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY5","Suitability for operation":"universal current","at DC / acc. to EN 60898-2":"10 kA","Current / at AC / rated value":"25 A","Tripping characteristic class":"B","at DC / rated value / maximum":"1 000 V","acc. to EN 60898 / rated value":"10 kA","Position / of power supply cord":"AC as required, observe DC polarity","Product feature / Touch protection":"Yes","Influence of the surrounding temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a2040311e34cb48691bbbf563ecaafcd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=386578&mlfb=5SY5425-6"},"ai":{"faq":[{"question":"Where can I buy the 5SY5425-6 and get a price?","answer":"Sourced and quoted 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":"What is the breaking capacity of the 5SY5425-6?","answer":"10 kA per EN 60898 (domestic/commercial standard) and 15 kA per IEC 60947-2 (industrial standard) at DC. The IEC figure is the one to use when the prospective fault current exceeds 10 kA."},{"question":"Will the 5SY5425-6 drop into a panel specified around the 5SY5232-6 without rewiring?","answer":"Both are 4-pole SENTRON 5SY5 breakers on the same DIN-rail footprint (72 mm wide, 4 width units), so the mechanical fit is identical. The difference is rating: 5SY5425-6 is 25 A B-curve; 5SY5232-6 is 32 A C-curve. If the circuit requires 25 A B-curve protection, the 5SY5425-6 is a direct swap — no rewiring needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY5425-6","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/5SY5425-6 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}}