{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0FA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0FA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0FA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0FA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV1421-0FA15, 0.5 A continuous, Class 10 trip, 100 kA breaking capacity at 400 V AC, for transformer protection, screw terminals, DIN-rail mount.","salesMarkdown":"## Transformer-protection circuit breaker, 0.5 A, Class 10 This means it handles inrush currents typical of transformers — up to 10× rated current for 10 seconds — without nuisance tripping, while still providing short-circuit and overload protection for the secondary side. ## Breaking capacity and voltage rating Rated breaking capacity is 100 kA across the full AC voltage range: 240 V, 400 V, 500 V, and 690 V. This gives the breaker ample headroom for industrial distribution panels where fault currents can be high, and it coordinates well with upstream fuses or MCCB feeders. Width is 45 mm, height 97 mm, depth 96 mm. Zero clearance required at the back and sides, so it packs tightly on the rail — useful when filling a panel with multiple motor starters or transformer feeders. IP20 front protection keeps fingers away from live terminals. ## Termination and auxiliary switch Main circuit terminals are screw-type, accepting 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 main contacts are 2x (14–10). Auxiliary and control circuits also use screw terminals. The breaker accepts a transverse auxiliary switch (product extension auxiliary switch = Yes), allowing remote status indication or interlocking.","metaTitle":"Siemens 3RV1421-0FA15 SIRIUS Circuit Breaker, 0.5 A, Class 1","metaDescription":"Siemens 3RV1421-0FA15 SIRIUS circuit breaker for transformer protection. 0.5 A continuous, Class 10 trip, 100 kA breaking capacity at 400 V. DIN-rail mount. Active production. Avai","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":"0.5 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":"0.5 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":"0.35 ... 0.5 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=501087&mlfb=3RV1421-0FA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0FA15/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV1421-0FA15 at 400 V?","answer":"The breaking capacity is 100 kA at 400 V AC, the same rating it holds at 240 V, 500 V, and 690 V."},{"question":"Where can I buy 3RV1421-0FA15?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 3RV1421-0FA15?","answer":"The part carries a substance prohibitance date of 01.05.2012, indicating RoHS compliance. Phase failure detection is integrated. For full declarations of conformity (CE, UKCA, UL), request the manufacturer's documentation pack with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0FA15","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/3RV1421-0FA15 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}}