{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0FA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0FA10","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0FA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0FA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for transformer protection, 3RV1421-0FA10, 0.5 A continuous rated current, Class 10 trip, 100 kA breaking capacity at 400 V AC, screw terminals, 45 mm width.","salesMarkdown":"## SIRIUS 3RV1421-0FA10 — transformer-protection circuit breaker, 0.5 A, Class 10 Its 0.5 A continuous rated current and Class 10 trip characteristic mean it opens fast enough to protect small control transformers from sustained overloads without nuisance tripping on inrush — a common pain point when a general-purpose breaker is used instead. Rated breaking capacity holds at 100 kA across the full AC voltage range — 240 V, 400 V, 500 V, and 690 V — so it handles high-fault-current scenarios without cascading upstream. Phase-failure detection is built in, which matters for three-phase transformer banks where losing one phase can overheat the remaining windings. At 45 mm wide and 97 mm tall, it takes a single 45 mm slot in a standard panel layout. Screw terminals accept 1 to 6 mm² solid or stranded — 2x conductors per clamp — so paralleling feeds or daisy-chaining to downstream terminals is straightforward. Depth is 96 mm — check clearance behind the DIN rail, especially in shallow enclosures. The IP20 finger-safe front means it can sit in a panel without additional shrouding, but the rear terminals are live when the breaker is on. Shock-rated to 25g / 11 ms, so it survives shipping and moderate vibration in the panel.","metaTitle":"Siemens 3RV1421-0FA10 SIRIUS Circuit Breaker, 0.5 A, Class 1","metaDescription":"Siemens SIRIUS 3RV1421-0FA10 circuit breaker for transformer protection. 0.5 A continuous, Class 10 trip, 100 kA breaking capacity at 400 V. Active production. Sourced to order aga","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":"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 00:00:00","Continuous Current Rated Value":"0.5 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":"1.8 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":"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=335102&mlfb=3RV1421-0FA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0FA10/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV1421-0FA10 and get a price?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Submit a request for current pricing and availability — confirmed at quote time."},{"question":"What is the breaking capacity of 3RV1421-0FA10?","answer":"Rated breaking capacity is 100 kA at 240 V, 400 V, 500 V, and 690 V AC."},{"question":"What conductor sizes does the 3RV1421-0FA10 accept?","answer":"Screw terminals accept 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²) solid or stranded conductors per clamp."},{"question":"Does 3RV1421-0FA10 include phase-failure detection?","answer":"Yes, phase-failure detection is built in. Ground-fault detection is not included."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0FA10","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/3RV1421-0FA10 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}}