{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1HA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1HA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1HA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1HA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1421-1HA15 circuit breaker for transformer protection, 8 A rated continuous current, CLASS 10 trip class, 100 kA breaking capacity at 400 V AC, screw-type terminals, 45 mm width, DIN rail mount.","salesMarkdown":"## Transformer-protection circuit breaker, 8 A, CLASS 10 The Siemens 3RV1421-1HA15 is a SIRIUS circuit breaker specifically designed for transformer protection, rated at 8 A continuous current with a CLASS 10 trip characteristic. The CLASS 10 trip class means it will disconnect within 10 seconds at 7.2× rated current, fast enough to protect transformers from sustained overloads while riding through inrush. Breaking capacity is 100 kA at 240 V and 400 V AC, dropping to 42 kA at 500 V and 6 kA at 690 V. The 100 kA SCCR at 400 V means this breaker can be used in high-fault panels without requiring a current-limiting upstream fuse — a real advantage when coordinating with a 100 kA-rated transformer feeder. Width is 45 mm, height 97 mm, depth 96 mm — fits standard 45 mm module spacing in control panels. Screw-type terminals for the main circuit accept 2x (0.5–1.5 mm²) solid or 2x (1–2.5 mm²) stranded; auxiliary terminals accept 2x (0.75–2.5 mm²) solid. Any mounting position allowed. Operating temperature range -20 to +60 °C; storage -50 to +80 °C.","metaTitle":"Siemens 3RV1421-1HA15 SIRIUS Circuit Breaker, 8 A, CLASS 10","metaDescription":"Siemens 3RV1421-1HA15 SIRIUS circuit breaker for transformer protection, 8 A rated, 100 kA breaking at 400 V, CLASS 10 trip, screw terminals, DIN rail mount, current lifecycle stag","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":"8 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":"8 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":"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=500002&mlfb=3RV1421-1HA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1HA15/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV1421-1HA15 and get a price?","answer":"The 3RV1421-1HA15 is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What is the closest functional second-source to 3RV1421-1HA15?","answer":"The 3RV2021-1FA15 is a peer in the SIRIUS family but is a different generation with different breaking capacities and terminal arrangements. The 3RV1421-1HA15 is specifically designed for transformer protection with CLASS 10 trip; verify coordination and physical fit before substituting."},{"question":"What is the depth of 3RV1421-1HA15?","answer":"The depth is 96 mm, with a width of 45 mm and height of 97 mm."},{"question":"What wire sizes does the 3RV1421-1HA15 accept?","answer":"Main circuit screw terminals accept 2x (0.5–1.5 mm²) solid or 2x (1–2.5 mm²) stranded; auxiliary terminals accept 2x (0.75–2.5 mm²) solid."},{"question":"Will 3RV1421-1HA15 drop into a panel specified for 3RV2021-1FA15 without rewiring?","answer":"Both mount on 35 mm DIN rail and share the same 45 mm width, but terminal arrangements and breaking capacities differ. Verify the terminal layout and coordination study before direct replacement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1HA15","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/3RV1421-1HA15 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}}