{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV6421-4DA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV6421-4DA10","canonicalUrl":"https://aoctrl.com/siemens/3RV6421-4DA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV6421-4DA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV6421-4DA10 circuit breaker for transformer protection, 3-pole, 25 A rated operational current, Class 10, 690 V AC-3, screw terminals, size S0.","salesMarkdown":"## Product identity and intended use Rated operational current is 25 A at AC-3 duty (400 V), and the trip class is Class 10, which means it will trip within 10 seconds at 7.2× rated current — fast enough to protect a transformer winding from sustained overload. The S0 frame size (45 mm wide, 97 mm tall, 96 mm deep) fits standard panel layouts. Clearance: 50 mm above and below, 30 mm at the sides, zero forward/backward — so it can sit flush against a backplate. Main circuit connections are top and bottom screw terminals, accepting 2×(1–2.5 mm²) solid/stranded or 2×(2.5–10 mm²) — torque to 2–2.5 N·m. ## Electrical ratings and environment Rated insulation voltage 690 V, surge voltage resistance 6 kV. Operates at 50–60 Hz.","metaTitle":"Siemens 3RV6421-4DA10 SIRIUS Circuit Breaker, Transformer Pr","metaDescription":"Siemens 3RV6421-4DA10 SIRIUS circuit breaker for transformer protection, 25 A rated, Class 10 trip, 690 V AC-3, 3-pole, screw terminals, DIN rail mount. Sourced to order against RF","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"96 mm","Width":"45 mm","Height":"97 mm","Upwards":"50 mm","Forwards":"0 mm","Backwards":"0 mm","Downwards":"50 mm","Trip Class":"CLASS 10","At The Side":"30 mm","Rated Value":"690 V","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","Design Of The Product":"for transformer protection","For Main Current Circuit":"screw-type terminals","Size Of The Circuit-Breaker":"S0","at AC-3 rated value maximum":"690 V","power loss [W] total typical":"8 W","Substance Prohibitance (Date)":"05/01/2012","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"25 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","Design Of The Short-Circuit Trip":"magnetic","Relative Humidity During Operation":"10 ... 95 %","operating frequency at AC-3 maximum":"15 1/h","Surge Voltage Resistance Rated Value":"6 kV","Finely Stranded With Core End Processing":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","shock resistance according to IEC 60068-2-27":"25g / 11 ms","operational current at AC-3 at 400 V rated value":"25 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"400 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","maximum short-circuit current breaking capacity (Icu) at AC at 400 V rated value":"55 kA","operating short-circuit current breaking capacity (Ics) at AC at 400 V rated value":"25 kA","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"18 ... 25 A"}},"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=621345&mlfb=3RV6421-4DA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV6421-4DA10/alternatives.json"},"ai":{"faq":[{"question":"What is 3RV6421-4DA10's listed depth?","answer":"The listed depth is 96 mm."},{"question":"What is 3RV6421-4DA10's listed width?","answer":"The listed width is 45 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV6421-4DA10","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/3RV6421-4DA10 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}}