{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1KA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1KA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1KA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1KA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for transformer protection, 3RV1421-1KA15, 12.5 A continuous, CLASS 10 trip, 100 kA SCCR at 400 V AC, screw-type terminals, IP20 front.","salesMarkdown":"## Transformer-protection breaker, 12.5 A, CLASS 10 — what you're getting At 45 mm wide and 97 mm tall, it fits a standard MCCB or motor-protective breaker footprint in the panel. Depth is 96 mm, so factor that into your gland-plate clearance if the breaker sits near the enclosure back wall. ## SCCR and interrupting capacity — the real numbers for your panel label This breaker carries a 100 kA short-circuit current rating at 240 V and 400 V AC, dropping to 42 kA at 500 V and 6 kA at 690 V. Rated operational voltage tops out at 690 V AC, with a maximum operating altitude of 2 000 m. Shock-rated to 25g for 11 ms — it'll hold up on a machine that sees occasional jolts. ## Terminals and wiring Solid wire accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²); stranded takes 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²). That covers standard control-panel wiring from 18 AWG up to about 10 AWG. The auxiliary switch is a transverse design — included, with zero dedicated auxiliary contacts on the main block, so the internal switch handles signaling.","metaTitle":"Siemens 3RV1421-1KA15 SIRIUS Circuit Breaker, 12.5 A, CLASS","metaDescription":"Siemens 3RV1421-1KA15 SIRIUS circuit breaker for transformer protection, 12.5 A continuous, CLASS 10 trip, 100 kA SCCR at 400 V. Current production. Quoted on request.","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","Maximum":"2 000 m","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","On The Front":"IP20","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","During Storage":"-50 ... +80 °C","at AC-3 maximum":"15 1/h","lifecycle_stage":"current","Auxiliary switch":"Yes","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Shock resistance":"25g / 11 ms","Mounting position":"any","Product brand name":"SIRIUS","Product designation":"circuit breaker","at 400 V rated value":"12.5 A","Design of the product":"for transformer protection","For Auxiliary Contacts":"0","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","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"9.25 W","Continuous current rated value":"12.5 A","Design of the auxiliary switch":"transverse","at AWG conductors for main contacts":"2x (14 ... 10)","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (18 ... 14)","For Auxiliary And Control Current Circuit":"screw-type terminals","Removable Terminal For Auxiliary And Control Circuit":"No","Design of the overcurrent release and short-circuit release":"thermomagnetic","Arrangement of electrical connectors for main current circuit":"front side","Adjustable pick-up value current of the current-dependent overload release":"9 ... 12.5 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=538584&mlfb=3RV1421-1KA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1KA15/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RV1421-1KA15?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through our independent distribution channels — we don't publish live stock numbers here."},{"question":"Will 3RV1421-1KA15 drop into a panel that was specified around 3RV2021-1FA15 without rewiring?","answer":"The 3RV2021-1FA15 is a different frame size — it's a 45 mm wide motor-protective breaker from the same SIRIUS family, but the 3RV1421 is a transformer-protection variant with a different trip curve. Both mount on 35 mm DIN rail, but verify the terminal arrangement and auxiliary contact layout against your existing wiring plan before swapping; the screw terminals accept the same wire ranges, so re-termination is straightforward if the footprint matches."},{"question":"What compliance documentation does this brand provide for 3RV1421-1KA15 (RoHS, REACH, UL, IEC)?","answer":"Siemens SIRIUS components typically carry CE marking per IEC/EN 60947 series and are UL/CSA recognized for the North American market. RoHS and REACH declarations are available from Siemens' documentation portal. Specific cert numbers for this order code should be verified against the nameplate or Siemens Industry Online Support."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1KA15","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/3RV1421-1KA15 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}}