{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0JA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0JA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0JA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0JA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for transformer protection, 3RV1421-0JA15, 1 A continuous rated current, Class 10 trip, 100 kA breaking capacity at 400 V AC, screw terminals, DIN-rail mount.","salesMarkdown":"It carries a continuous rated current of 1 A and a Trip Class 10, so it will disconnect within 10 seconds at 7.2× rated current, which is the standard for protecting motor and transformer circuits against overload. ## Breaking capacity and fault clearing The 3RV1421-0JA15 delivers 100 kA breaking capacity across the board — at 240 V, 400 V, 500 V, and 690 V AC. For a transformer primary circuit, this level of SCCR (short-circuit current rating) gives you headroom to coordinate with upstream fuses or a main breaker, keeping selectivity simple. ## Auxiliary contacts and control wiring The breaker accepts an auxiliary switch (product extension available) that mounts transversely. The auxiliary contact ratings are 1 A at 24 V, 0.5 A at 230 V, and 0.15 A at 60 V — these are the switching capacities for the signal contacts, not the main circuit. For control wiring, the screw terminals accept solid conductors from 0.5 to 1.5 mm² (two per terminal) or stranded from 1 to 2.5 mm². The main circuit terminals take AWG 14–10. The breaker itself draws no control power; the 7.25 W power dissipation at AC-3 hot operating state is heat that needs to be considered in a dense panel. The breaker meets RoHS and REACH substance restrictions, with a substance prohibition date of 01.05.2012 — meaning it has been compliant since that date.","metaTitle":"Siemens 3RV1421-0JA15 SIRIUS Circuit Breaker, 1 A, Class 10","metaDescription":"Siemens 3RV1421-0JA15 SIRIUS circuit breaker for transformer protection, 1 A continuous, Class 10, 100 kA breaking capacity at 400 V. Active production, sourced to order. Request a","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":"7.25 W","Substance Prohibitance (Date)":"01.05.2012","Continuous Current Rated Value":"1 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":"2.4 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":"1 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":"0.7 ... 1 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=312261&mlfb=3RV1421-0JA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0JA15/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV1421-0JA15 at 400 V?","answer":"The breaking capacity is 100 kA at 400 V AC, and the same 100 kA rating applies at 240 V, 500 V, and 690 V AC."},{"question":"Does 3RV1421-0JA15 have phase failure detection?","answer":"Yes, phase failure detection is built into this breaker — it will trip if one phase drops out, protecting the transformer from single-phasing."},{"question":"What is the continuous current rating of 3RV1421-0JA15?","answer":"The continuous rated current is 1 A, and the trip class is CLASS 10 (trips within 10 seconds at 7.2× rated current)."},{"question":"Where can I buy 3RV1421-0JA15?","answer":"This part is sourced and quoted to order through independent distribution. Submit an RFQ for current availability and pricing — stock and lead time are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0JA15","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/3RV1421-0JA15 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}}