{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1DA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1DA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1DA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1DA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1421-1DA15 circuit breaker for transformer protection, 3.2 A rated at 400 V, CLASS 10 trip, 100 kA breaking capacity at 400 V, 45 mm wide, screw terminals.","salesMarkdown":"CLASS 10 trip means it must clear a fault within 10 seconds at 7.2x I_r, which is standard for motor and transformer protection on SIRIUS contactor assemblies. At 690 V the breaking capacity drops to 8 kA — still usable for 690 V panels but needs coordination review on high-fault circuits. ## Panel integration Width is 45 mm — fits a standard 9 mm pitch DIN-rail slot. Depth of 96 mm means it clears most 120 mm deep enclosures. Screw terminals accept solid 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²), stranded 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²). No auxiliary contacts on this variant (0 built-in), but an add-on auxiliary switch block can be mounted transversely. IP20 front, so it's protected against finger contact — fine for enclosed panels.","metaTitle":"Siemens 3RV1421-1DA15 SIRIUS Circuit Breaker, 3.2 A, CLASS 1","metaDescription":"Siemens 3RV1421-1DA15 SIRIUS circuit breaker for transformer protection, 3.2 A at 400 V, CLASS 10 trip, 100 kA breaking capacity. Current lifecycle stage. 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 (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":"3.2 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":"100 kA","at AC at 690 V rated value":"8 kA","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"7.25 W","Continuous current rated value":"3.2 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":"2.4 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":"2.2 ... 3.2 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=478382&mlfb=3RV1421-1DA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1DA15/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV1421-1DA15 drop into a panel specified around 3RV1011-1AA15?","answer":"Both are SIRIUS 45 mm wide circuit breakers on 35 mm DIN rail, but the 3RV1421-1DA15 is designed for transformer protection while the 3RV1011-1AA15 is a standard motor-protective variant. Terminal layouts and trip curves differ — verify the BOM before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1DA15","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/3RV1421-1DA15 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}}