{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0KA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0KA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0KA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0KA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for transformer protection, 3RV1421-0KA15, 1.25 A continuous rating, CLASS 10 trip class, 100 kA breaking capacity up to 690 V AC, screw-type terminals, 45 mm wide, snap-on 35 mm DIN rail mount.","salesMarkdown":"## Transformer-protection circuit breaker, 1.25 A, CLASS 10 This means it handles the inrush of a transformer without nuisance tripping — CLASS 10 allows up to 10 seconds at 7.2x rated current, which covers magnetizing inrush on small to medium transformers. The 100 kA breaking capacity holds at 240 V, 400 V, 500 V, and 690 V AC, so this single part covers the full low-voltage range without derating on fault clearing. The auxiliary switch is a transverse design and the product extension allows adding auxiliary contacts later without replacing the entire unit. ## Mounting and wiring — 45 mm wide, screw terminals, DIN rail Screw-type terminals on both the main and auxiliary/control circuits. Main circuit accepts 2x (0.5 to 1.5 mm²) solid or 2x (1 to 2.5 mm²) stranded, and 2x (0.75 to 2.5 mm²) solid or 2x (2.5 to 6 mm²) stranded — covers most panel wiring up to 6 mm². AWG equivalents are 2x (14 to 10) for the main contacts. Front protection is IP20, safe for finger-probe access inside an enclosure. ## Environmental limits and power dissipation Operates from -20 °C to +60 °C, stores and transports from -50 °C to +80 °C. Shock resistance is 25g for 11 ms.","metaTitle":"Siemens 3RV1421-0KA15 SIRIUS Circuit Breaker, 1.25 A, CLASS","metaDescription":"Siemens 3RV1421-0KA15 SIRIUS circuit breaker for transformer protection. 1.25 A continuous, CLASS 10 trip, 100 kA breaking capacity at 400 V. Screw terminals, DIN rail mount. Curre","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"96 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"45 mm","Height":"97 mm","at 24 V":"1 A","at 60 V":"0.15 A","Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","at 230 V":"0.5 A","Backwards":"0 mm","Trip Class":"CLASS 10","At The Side":"0 mm","Rated Value":"690 V","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Shock Resistance":"25g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Product Designation":"circuit breaker","Design Of The Product":"for transformer protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"100 kA","at AC at 500 V rated value":"100 kA","at AC at 690 V rated value":"100 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"7.25 W","Substance Prohibitance (Date)":"01.05.2012","Continuous Current Rated Value":"1.25 A","Design Of The Auxiliary Switch":"transverse","at AWG cables for main contacts":"2x (14 ... 10)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","operating frequency at AC-3 maximum":"15 1/h","Surge Voltage Resistance Rated Value":"6 000 V","at AWG cables for auxiliary contacts":"2x (18 ... 14)","at AC in hot operating state per pole":"2.4 W","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Touch Protection Against Electrical Shock":"finger-safe","number of CO contacts for auxiliary contacts":"0","operational current at AC-3 at 400 V rated value":"1.25 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Design Of The Overcurrent Release And Short-Circuit Release":"thermomagnetic","Arrangement Of Electrical Connectors For Main Current Circuit":"front side","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","Mechanical Service Life (Switching Cycles) Of The Main Contacts Typical":"100 000","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.9 ... 1.25 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=34250&mlfb=3RV1421-0KA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0KA15/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3RV1421-0KA15 and how is it quoted for volume purchases?","answer":"We source this part through independent distribution channels. Submit an RFQ for current availability and volume pricing — availability and price are confirmed at quote time."},{"question":"What is 3RV1421-0KA15's listed depth?","answer":"The depth is 96 mm, with a width of 45 mm and height of 97 mm."},{"question":"What compliance documentation does 3RV1421-0KA15 carry?","answer":"The part meets RoHS (substance prohibition date 01.05.2012) and REACH requirements, and carries a 6 kV surge voltage resistance rating indicating IEC 60947-2 compliance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0KA15","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/3RV1421-0KA15 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}}