{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-4AA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-4AA10","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-4AA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-4AA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV1421-4AA10, for transformer protection, 16 A rated, CLASS 10 trip, 50 kA breaking capacity at 400 V AC, screw terminals, 45 mm wide.","salesMarkdown":"## What it is and what it does The Siemens 3RV1421-4AA10 is a SIRIUS circuit breaker designed specifically for transformer protection — not a general-purpose motor-protective breaker, but one tuned for the inrush and overload profile of a transformer primary. It carries a continuous current rating of 16 A and a rated insulation voltage of 690 V. The CLASS 10 trip characteristic means it will open within 10 seconds at 7.2× rated current, which is fast enough to protect a transformer winding from sustained overload without nuisance-tripping on magnetizing inrush. ## Mounting and wiring Snaps onto 35 mm DIN rail per DIN EN 50022 — screw and snap-on, so it stays put under vibration. The 45 mm width eats one standard module slot. Screw-type terminals on both main and auxiliary circuits; accepts solid or stranded wire up to 6 mm², with two conductors per clamp. No backwards clearance needed, so you can butt it against the left side of the enclosure. Mount in any position. ## Protection and diagnostics Phase failure detection is built in — if one phase drops out, the breaker trips. No ground-fault detection, so that needs a separate module if required. The front is IP20 finger-safe. Surge voltage resistance is 6 kV. Power dissipation runs 9.25 W total, 3.1 W per pole.","metaTitle":"Siemens 3RV1421-4AA10 SIRIUS Circuit Breaker, 16 A, Transfor","metaDescription":"Siemens 3RV1421-4AA10 SIRIUS circuit breaker for transformer protection, 16 A continuous, 50 kA at 400 V AC, CLASS 10 trip, phase failure detection, DIN rail mount. Sourced to orde","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 DIN 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":"9.25 W","Substance Prohibitance (Date)":"05/01/2012","Continuous Current Rated Value":"16 A","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":"3.1 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":"16 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 (Operating Cycles) Of The Main Contacts Typical":"100 000","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"11 ... 16 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=268144&mlfb=3RV1421-4AA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-4AA10/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to 3RV1421-4AA10?","answer":"The 3RV6021-4DA10 is a functional peer in the same SIRIUS family, but verify the trip class and breaking capacity against your transformer's inrush profile — the 3RV1421-4AA10 is specifically designed for transformer protection and may have a different trip curve than a general-purpose motor-protective breaker."},{"question":"What compliance documentation does Siemens provide for 3RV1421-4AA10?","answer":"RoHS compliance is confirmed with a substance prohibition date of May 1, 2012. Standard Siemens documentation includes a CE declaration and manufacturer's declaration for the EU low-voltage directive. For UL or IEC certifications, request the specific declaration from your Siemens contact or distributor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-4AA10","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/3RV1421-4AA10 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}}