{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV6421-4CA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV6421-4CA10","canonicalUrl":"https://aoctrl.com/siemens/3RV6421-4CA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV6421-4CA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, circuit breaker for transformer protection, 3RV6421-4CA10, 22 A rated operational current, Trip Class 10, 690 V, 50/60 Hz, size S0, screw-type terminals, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"## Transformer-protection circuit breaker, 22 A, Class 10 The Siemens 3RV6421-4CA10 is a SIRIUS-brand circuit breaker specifically designed for transformer protection, not general motor starting. Its 22 A rated operational current (AC-3 at 400 V) and Trip Class 10 thermal-magnetic release mean it clears overloads on inrush-heavy transformer loads — the magnetic short-circuit trip handles faults, while the thermal element rides through the magnetizing inrush without nuisance tripping. The S0 frame size keeps the footprint compact at 45 mm wide, 97 mm tall, 96 mm deep — fits standard 35 mm DIN rail per DIN EN 60715, screw or snap-on mount, any position. The S0 size leaves 50 mm clearance upward and downward, 30 mm to the side — no forward or backward clearance needed. Panel integration is straightforward: wire top and bottom with screw terminals accepting 2x (1…2.5 mm²) solid/stranded or 2x (2.5…10 mm²) solid; torque to 2…2.5 N·m. Ambient operating range -20 to +60 °C, 10-95% RH non-condensing. Installation altitude up to 2000 m. Shock rated 25 g / 11 ms per IEC 60068-2-27 — suitable for panel-mounted applications in industrial environments. RoHS compliance date marked 05/01/2012. No UL, CSA, or CE marks appear in the spec record — verify with your quality team for the target jurisdiction. The magnetic short-circuit release handles fault clearing; the product explicitly includes short-circuit protection (yes). Rated operational current 22 A at AC-3 duty (400 V) is the switching current for motor-like loads; for transformer protection the continuous current rating governs. Power loss typical 8 W total — factor into enclosure thermal calculations.","metaTitle":"Siemens 3RV6421-4CA10 SIRIUS Circuit Breaker, 22 A, Class 10","metaDescription":"Siemens 3RV6421-4CA10 SIRIUS circuit breaker for transformer protection, 22 A rated current, Trip Class 10, 690 V, 50/60 Hz, S0 size, screw terminals, DIN rail mount. Active lifecy","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":"22 A","Design Of The Short-Circuit Trip":"magnetic","for AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","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":"22 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":"364 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":"16 ... 22 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e83d580dda187fe137481988ffb4194e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621344&mlfb=3RV6421-4CA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV6421-4CA10/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RV6421-4CA10 used for?","answer":"It is a circuit breaker designed specifically for transformer protection — the thermal-magnetic release is tuned for transformer inrush characteristics, not general motor starting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV6421-4CA10","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/3RV6421-4CA10 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}}