{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-4BA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-4BA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-4BA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-4BA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV1421-4BA15, for transformer protection, 20 A continuous, CLASS 10 trip, 100 kA SCCR at 240 V AC, screw terminals, 45 mm width.","salesMarkdown":"The Siemens 3RV1421-4BA15 is a SIRIUS circuit breaker designed specifically for transformer protection, rated at 20 A continuous current with a CLASS 10 trip characteristic. It mounts on a 35 mm DIN rail per DIN EN 50022 using screw and snap-on fastening, occupying a 45 mm width in the panel. ## Short-Circuit and Overload Ratings The interrupting capacity is 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. These SCCR values determine where in the distribution this breaker can be applied — the 100 kA at 240 V suits high-fault utility feeds, while the 4 kA at 690 V covers the upper voltage range for transformer primary protection. The CLASS 10 trip curve means it clears overloads within 10 seconds at 600% of rated current, matching the inrush profile of transformers. Main circuit terminals accept solid conductors 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²), or stranded 2x (1...2.5 mm²) and 2x (2.5...6 mm²). AWG equivalents for the main contacts are 2x (14...10). Auxiliary and control circuits use screw-type terminals as well. The auxiliary switch is transverse design and the breaker supports product extension for auxiliary switches. Operating temperature range is -20 to +60 °C, storage and transport -50 to +80 °C. Shock resistance is 25g for 11 ms. The product is RoHS compliant with a substance prohibition date of 01.05.2012. The lifecycle stage is current production.","metaTitle":"Siemens 3RV1421-4BA15 SIRIUS Circuit Breaker, 20 A, Transfor","metaDescription":"Siemens 3RV1421-4BA15 SIRIUS circuit breaker for transformer protection, 20 A continuous, CLASS 10, 100 kA at 240 V AC. Active production, sourced to order. Request quote.","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":"50 kA","at AC at 500 V rated value":"10 kA","at AC at 690 V rated value":"4 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"10.5 W","Substance Prohibitance (Date)":"01.05.2012","Continuous Current Rated Value":"20 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":"3.5 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":"20 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":"14 ... 20 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=470873&mlfb=3RV1421-4BA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-4BA15/alternatives.json"},"ai":{"faq":[{"question":"What is the interrupting capacity of 3RV1421-4BA15 at different voltages?","answer":"The SCCR is 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. These values determine the maximum fault current the breaker can safely interrupt at each voltage level."},{"question":"What terminal wire sizes does 3RV1421-4BA15 accept?","answer":"Solid conductors: 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²). Stranded: 2x (1...2.5 mm²) and 2x (2.5...6 mm²). AWG for main contacts: 2x (14...10). All terminals are screw-type."},{"question":"Where can I buy 3RV1421-4BA15 and what is the lead time?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current lead time are confirmed at quote time — no stock count or shipping promise is stated here."},{"question":"What compliance documentation does 3RV1421-4BA15 carry?","answer":"RoHS compliance with substance prohibition date 01.05.2012. Surge voltage resistance 6,000 V. IP20 front protection. The SIRIUS series typically carries UL, CSA, and CE certifications, though specific marks are not listed in this evidence."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-4BA15","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/3RV1421-4BA15 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}}