{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1CA10-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1CA10-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1CA10-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1CA10-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, circuit breaker for transformer protection, 3RV1421-1CA10-0BA0, 2.5 A continuous, Class 10 trip, 100 kA breaking capacity at 400 V AC, 3-pole, screw terminals.","salesMarkdown":"The Siemens 3RV1421-1CA10-0BA0 is a SIRIUS circuit breaker specifically designed for transformer protection. The 45 mm width means it takes a single modular slot — factor that into your enclosure fill count. Screw-type terminals on both main and auxiliary circuits accept solid or stranded wire: 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²), plus 2x (14 to 10 AWG). Strip length and torque aren't listed here, but the terminal design is standard for the SIRIUS family. Mounting position is any, so no derating for side or inverted orientation. ## Breaking capacity and fault clearing The interrupting rating is voltage-dependent: 100 kA at 240 V, 400 V, and 500 V AC, dropping to 8 kA at 690 V AC. The 8 kA at 690 V still covers the majority of 690 V distribution systems, but if your fault current exceeds that, you'll need to coordinate with a higher-rated upstream device. ## Environmental and protection specs Operates from -50 to +60 °C, stores and ships from -50 to +80 °C — fine for unheated warehouses or outdoor cabinets in temperate climates. ## Power dissipation and switching frequency At rated load in hot operating state, the breaker dissipates 7.25 W total, or 2.4 W per pole. That's low enough to ignore in most enclosures, but if you're packing dozens of these in a sealed box, sum the dissipation and check the temperature rise. Maximum switching frequency is 15 operations per hour at AC-3 duty — fine for infrequent transformer switching, not for a cycling load like a welding gun.","metaTitle":"Siemens 3RV1421-1CA10-0BA0 SIRIUS Circuit Breaker, 2.5 A, Cl","metaDescription":"Siemens 3RV1421-1CA10-0BA0 SIRIUS circuit breaker for transformer protection. Rated 2.5 A continuous, Class 10 trip, 100 kA breaking at 400 V. Active production, sourced 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":"-50 ... +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":"8 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":"2.5 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":"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":"2.5 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":"500","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"1.8 ... 2.5 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=122686&mlfb=3RV1421-1CA10-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1CA10-0BA0/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RV1421-1CA10-0BA0?","answer":"The depth is 96 mm. Overall dimensions are 45 mm wide, 97 mm tall, 96 mm deep."},{"question":"What wire sizes does the 3RV1421-1CA10-0BA0 accept?","answer":"Screw terminals accept solid or stranded wire: 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²), or 2x (14 to 10 AWG) for the main contacts."},{"question":"Will 3RV1421-1CA10-0BA0 drop into a panel specified for 3RV2021-1FA15?","answer":"Both are 45 mm wide and mount on 35 mm DIN rail, but the terminal layout and auxiliary contact positions may differ. Check the wiring diagram before swapping — the 3RV2021 generation uses a different terminal arrangement for the auxiliary switch."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1CA10-0BA0","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/3RV1421-1CA10-0BA0 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}}