{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1AA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1AA10","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1AA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1AA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS transformer protection circuit breaker, 3RV1421-1AA10, 1.6 A continuous, 100 kA breaking capacity at 400 V AC, CLASS 10 trip, 3-pole, screw terminals, DIN rail mount.","salesMarkdown":"## Transformer protection circuit breaker — 1.6 A, 100 kA, CLASS 10 The Siemens SIRIUS 3RV1421-1AA10 is a 3-pole circuit breaker designed specifically for transformer protection, rated at 1.6 A continuous current with a 100 kA breaking capacity across the full voltage range up to 690 V AC. That 100 kA holds at 240 V, 400 V, 500 V, and 690 V — no derating as voltage climbs, which is unusual for a breaker this compact. The 45 mm width (3-module) footprint fits standard panel layouts. Screw-type terminals on both main and auxiliary circuits accept solid or stranded copper up to 6 mm² (2x 1–2.5 mm² or 2x 2.5–6 mm² per terminal). ## Protection features and ratings Ground fault detection is not included; that would require an external module. Power dissipation is 7.25 W total hot (2.4 W per pole), which is modest for a 1.6 A breaker — panel thermal budgeting is straightforward. The IP20 front protection and finger-safe touch protection (per the evidence) mean the front face is safe for operator access in a closed panel. Shock resistance is rated at 25g for 11 ms, and the operating temperature range is -20 to +60 °C, with storage/transport from -50 to +80 °C. The auxiliary switch extension option (product extension auxiliary switch = Yes) allows remote status indication. The substance prohibitance date of 01.05.2012 indicates RoHS compliance. The SIRIUS series carries CE marking as standard for the European market.","metaTitle":"Siemens 3RV1421-1AA10 SIRIUS Circuit Breaker, 1.6 A, 100 kA","metaDescription":"Siemens SIRIUS 3RV1421-1AA10 transformer protection circuit breaker, 1.6 A continuous, 100 kA breaking capacity at 400 V, CLASS 10 trip. Current lifecycle stage. Available to order","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":"7.25 W","Substance Prohibitance (Date)":"01.05.2012 00:00:00","Continuous Current Rated Value":"1.6 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":"2.4 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":"1.6 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":"1.1 ... 1.6 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=277649&mlfb=3RV1421-1AA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1AA10/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RV1421-1AA10?","answer":"The 3RV1011-1AA15 is a close functional peer within the SIRIUS family — same 1.6 A continuous rating and CLASS 10 trip, but it is a standard motor-protective circuit breaker rather than a transformer-protection design. The 3RV1421-1AA10 includes phase failure detection and a higher 100 kA breaking capacity that the 3RV1011 series may not match at all voltage levels. Verify the 3RV1011-1AA15's breaking capacity at your system voltage before substituting."},{"question":"What is the depth of 3RV1421-1AA10?","answer":"The depth is 96 mm, with a width of 45 mm and height of 97 mm."},{"question":"What wire sizes does 3RV1421-1AA10 accept?","answer":"The screw terminals accept solid or stranded conductors: 2x (1–2.5 mm²) or 2x (2.5–6 mm²) per terminal, or 2x (14–10 AWG)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1AA10","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/3RV1421-1AA10 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}}