{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0BA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0BA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0BA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0BA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1421-0BA15 circuit breaker for transformer protection, 0.2 A continuous current, Class 10 trip, 100 kA breaking capacity at 400 V AC, screw terminals, 45 mm width, DIN rail mount.","salesMarkdown":"The Siemens 3RV1421-0BA15 is a SIRIUS circuit breaker specifically designed for transformer protection. It carries a continuous current rating of 0.2 A and a Trip Class of CLASS 10, meaning it will trip within 10 seconds at 7.2× the rated current — a standard thermal-magnetic curve matched to inrush characteristics of small control transformers. The interrupting rating holds at 100 kA across the full AC voltage range: 240 V, 400 V, 500 V, and 690 V. That is a flat high-fault curve — no derating as voltage climbs, which simplifies panel SCCR calculations when this breaker feeds a transformer primary. The auxiliary switch contacts are rated at 1 A at 24 V, 0.5 A at 230 V, and 0.15 A at 60 V — these are the make/break capacities for the signal circuit, not the main power path. The 45 mm width (three module spaces) and 96 mm depth fit standard distribution panels. Mounting position is any orientation; no derating required for side-by-side placement — backwards and side clearances are both 0 mm. Solid conductor capacity is 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²); stranded accepts 2x (1... 2.5 mm²) and 2x (2.5... 6 mm²). AWG equivalents for main contacts are 2x (14... 10). Substance prohibitance date of 01.05.2012 aligns with RoHS compliance scope. Phase failure detection is included; ground fault detection is not built in — that would require an external RCD or a separate 3RV ground-fault variant. ## Sourcing posture","metaTitle":"Siemens 3RV1421-0BA15 SIRIUS Circuit Breaker, 0.2 A, Class 1","metaDescription":"Siemens 3RV1421-0BA15 SIRIUS circuit breaker for transformer protection. 0.2 A continuous, Class 10 trip, 100 kA breaking capacity at 400 V. Screw terminals, DIN rail mount. Availa","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":"5.5 W","Substance Prohibitance (Date)":"01.05.2012","Continuous Current Rated Value":"0.2 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":"1.8 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":"0.2 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":"0.14 ... 0.2 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=129098&mlfb=3RV1421-0BA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0BA15/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV1421-0BA15 at 400 V?","answer":"It is rated at 100 kA at 400 V AC, and holds that same 100 kA rating at 240 V, 500 V, and 690 V AC."},{"question":"Where can I buy 3RV1421-0BA15?","answer":"It is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing for your required quantity."},{"question":"What compliance documentation does Siemens provide for 3RV1421-0BA15?","answer":"The substance prohibitance date of 01.05.2012 indicates RoHS compliance. The part carries CE marking as a Siemens SIRIUS product. For specific UL, CSA, or IEC certification documents, request them with your RFQ."},{"question":"Will 3RV1421-0BA15 drop into a panel specified around 3RV1011-0GA10 without rewiring?","answer":"Both are 45 mm wide SIRIUS breakers on the same DIN rail footprint, so the mechanical fit is identical. The terminal capacity and wiring ranges are comparable. However, the 3RV1421-0BA15 is a transformer-protection variant with a different trip curve than the 3RV1011 motor-protection series — verify the trip coordination for your specific load before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0BA15","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/3RV1421-0BA15 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}}