{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1KA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1KA10","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1KA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1KA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1421-1KA10, circuit breaker for transformer protection, 3-pole, 12.5 A continuous, CLASS 10, 100 kA breaking capacity at 400 V AC, screw terminals, IP20 front.","salesMarkdown":"## Transformer Protection Circuit Breaker — 12.5 A, CLASS 10 Three-pole construction, screw-type terminals for the main and auxiliary circuits, and it fits a 45 mm wide DIN-rail footprint. The interrupting rating drops as system voltage rises — 100 kA at 240 V and 400 V AC, 42 kA at 500 V, and 6 kA at 690 V AC. ## Phase Failure Detection and Mounting Built-in phase failure detection means the breaker will trip if one phase drops out — critical for a transformer that would otherwise single-phase and overheat the remaining windings. The front is IP20 finger-safe; the terminals are touch-protected as well. Shock-rated to 25g for 11 ms, which holds it on the rail through a vibration event in a substation or on a machine skid.","metaTitle":"Siemens 3RV1421-1KA10 SIRIUS Circuit Breaker, 12.5 A, CLASS","metaDescription":"Siemens 3RV1421-1KA10 SIRIUS circuit breaker for transformer protection. 12.5 A continuous, CLASS 10 trip, 100 kA at 400 V AC. Current lifecycle stage. Sourced to order against RFQ","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 (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","Width":"45 mm","Height":"97 mm","Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","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":"42 kA","at AC at 690 V rated value":"6 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"9.25 W","Substance Prohibitance (Date)":"01.05.2012 00:00:00","Continuous Current Rated Value":"12.5 A","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 AC in hot operating state per pole":"3.1 W","Finely Stranded With Core End Processing":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 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":"12.5 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":"9 ... 12.5 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=343917&mlfb=3RV1421-1KA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1KA10/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RV1421-1KA10 and how is it quoted?","answer":"The 3RV1421-1KA10 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of the 3RV1421-1KA10 at 400 V?","answer":"The 3RV1421-1KA10 has a breaking capacity of 100 kA at 400 V AC."},{"question":"Does the 3RV1421-1KA10 have phase failure detection?","answer":"Yes, the 3RV1421-1KA10 includes phase failure detection, which will trip the breaker if one phase drops out."},{"question":"What compliance documentation does the 3RV1421-1KA10 carry?","answer":"The 3RV1421-1KA10 has a RoHS compliance date of 01.05.2012, indicating it is fully RoHS-compliant. The front carries IP20 protection, and the terminals are finger-safe for touch protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1KA10","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/3RV1421-1KA10 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}}