{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2421-1AA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2421-1AA10","canonicalUrl":"https://aoctrl.com/siemens/3RV2421-1AA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2421-1AA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2421-1AA10, for transformer protection, CLASS 10 trip, 100 kA breaking capacity at 400 V AC, screw and snap-on DIN rail mounting.","salesMarkdown":"The Siemens 3RV2421-1AA10 is a SIRIUS circuit breaker specifically designed for transformer protection, not general motor or cable protection. Its CLASS 10 trip characteristic means it clears faults quickly enough to limit let-through energy to downstream transformers, while the 100 kA breaking capacity at 400 V AC gives it the headroom to handle high-fault utility feeds without cascading upstream. The same 100 kA rating holds at 240 V, 500 V, and 690 V — so the interrupting rating doesn't derate with voltage on this unit, which simplifies coordination studies. ## Mounting and fit Any mounting position is acceptable, so it fits in tight sub-panels or vertical bus stacks. Forwards clearance is 0 mm, so it can sit flush against a panel door or gland plate without needing an air gap. ## Trip class and protection logic Rated for transformer protection, the CLASS 10 trip ensures the breaker opens within 10 seconds at 600% of the thermal setting — fast enough to avoid saturating the transformer core during a bolted fault. No ground fault detection — that's handled separately downstream if needed. The lifecycle stage is current, meaning Siemens still produces this order code.","metaTitle":"Siemens 3RV2421-1AA10 SIRIUS Circuit Breaker, 100 kA at 400","metaDescription":"Siemens 3RV2421-1AA10 SIRIUS circuit breaker for transformer protection. 100 kA breaking capacity at 400 V AC, CLASS 10 trip, screw/snap-on DIN rail. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"97 mm","Width":"45 mm","title":"3RV2421-1AA10","Height":"97 mm","Upwards":"50 mm","Forwards":"0 mm","at 500 V":"gL/gG 20 A","at 690 V":"gL/gG 16 A","Backwards":"0 mm","Downwards":"50 mm","Trip Class":"CLASS 10","At The Side":"30 mm","Rated Value":"20 ... 690 V","description":"Circuit breaker size S0 For transformer protection A-release 1.1...1.6 A Short-circuit release 33 A Screw terminal Standard switching capacity","During Storage":"-50 ... +80 °C","at AC-3 maximum":"15 1/h","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 60715","at AC-3e maximum":"15 1/h","For Main Contacts":"M4","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"0.1 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"1.6 A","at 500 V rated value":"100 kA","at 600 V rated value":"1.6 A","at 690 V rated value":"100 kA","Design Of The Product":"For transformer protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","at 460/480 V rated value":"1 hp","at 575/600 V rated value":"0.8 hp","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":"100 kA","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"Pozidriv size 2","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"5.5 W","at AC-3 at 400 V rated value":"1.6 A","at AC-3e rated value maximum":"690 V","Of Auxiliary Contacts Typical":"100 000","Substance Prohibitance (Date)":"10/01/2009","at AC-3e at 400 V rated value":"1.6 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"1.6 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","Design Of The Short-Circuit Trip":"magnetic","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Handle","Surge Voltage Resistance Rated Value":"6 kV","at AC in hot operating state per pole":"1.8 W","With Side-By-Side Mounting At The Side":"0 mm","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","with low demand rate according to SN 31920":"50 FIT","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","with high demand rate according to SN 31920":"50 %","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","shock resistance according to IEC 60068-2-27":"25g / 11 ms","Electrical Endurance (Switching Cycles) Typical":"100 000","Size Of Contactor Can Be Combined Company-Specific":"S00, S0","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"33 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"1.1 ... 1.6 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9bae715b7219d3a0e02a59b7a4fc14f5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1135050&mlfb=3RV2421-1AA10"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2421-1AA10","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/3RV2421-1AA10 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}