{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1HA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1HA10","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1HA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1HA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, circuit breaker for transformer protection, 3RV1421-1HA10, 3-pole, 8 A, Trip Class 10, 100 kA breaking capacity at 400 V AC, screw terminals, DIN EN 50022 rail mount.","salesMarkdown":"The Siemens SIRIUS 3RV1421-1HA10 is a 3-pole circuit breaker designed specifically for transformer protection, rated at 8 A continuous current with a Trip Class 10 characteristic. It mounts on a 35 mm DIN rail per DIN EN 50022 via screw or snap-on, and accepts screw-type terminals for both main and auxiliary circuits — solid wire up to 6 mm², stranded up to 6 mm² with ferrule. At 400 V AC it interrupts faults up to 100 kA; at 690 V AC that drops to 6 kA, so keep it coordinated with downstream devices. The 45 mm wide body — 97 mm tall, 96 mm deep — fits a standard 45 mm slot on the rail with zero required clearance at the back or sides. Power dissipation runs 9.25 W total in hot operating state, or 3.1 W per pole — plan for that in a sealed enclosure with limited convection. Shock-rated to 25g / 11 ms, so it survives transport and moderate panel vibration.","metaTitle":"Siemens 3RV1421-1HA10 SIRIUS Circuit Breaker, 8 A, Class 10","metaDescription":"Siemens 3RV1421-1HA10 SIRIUS circuit breaker for transformer protection, 8 A rated current, Trip Class 10, 100 kA breaking at 400 V, 3-pole, DIN rail mount. 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":"42 kA","at AC at 690 V rated value":"6 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"9.25 W","Substance Prohibitance (Date)":"01.05.2012 00:00:00","Continuous Current Rated Value":"8 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":"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":"8 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":"5.5 ... 8 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=389412&mlfb=3RV1421-1HA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1HA10/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 3RV1421-1HA10 at different voltages?","answer":"At 240 V AC it's 100 kA, at 400 V AC it's 100 kA, at 500 V AC it's 42 kA, and at 690 V AC it's 6 kA. The steep drop above 500 V means you need to verify coordination with upstream protection if running at 690 V."},{"question":"Does the 3RV1421-1HA10 detect phase failure?","answer":"Yes, phase failure detection is included. Ground fault detection is not — that's a separate function not built into this breaker."},{"question":"What wire sizes fit the screw terminals on the 3RV1421-1HA10?","answer":"Solid wire accepts 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²); stranded with ferrule accepts the same ranges. AWG equivalents are 2x (14 to 10) for the main contacts."},{"question":"How do I get pricing and availability for the 3RV1421-1HA10?","answer":"Submit an RFQ through this listing. Current pricing and stock levels are confirmed at quote time through independent distribution channels."},{"question":"What is the operating temperature range for the 3RV1421-1HA10?","answer":"During operation it's -20 to +60 °C; storage and transport range is -50 to +80 °C. The storage limit governs handling, not running conditions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1HA10","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/3RV1421-1HA10 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}}