{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2421-1EA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2421-1EA10","canonicalUrl":"https://aoctrl.com/siemens/3RV2421-1EA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2421-1EA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2421-1EA10, for transformer protection, 100 kA SCCR at 400 V, Trip Class 10, screw and snap-on 35 mm DIN rail mount.","salesMarkdown":"## Transformer-protection circuit breaker, SIRIUS series The Siemens 3RV2421-1EA10 is a SIRIUS circuit breaker explicitly designed for transformer protection, not general motor or feeder duty. Zero clearance needed forward or backward, so it can sit flush against a gland plate or back panel. Screw-type terminals on the main circuit accept 2× (1 to 2.5 mm²) or 2× (2.5 to 10 mm²) solid or stranded copper. M4 terminal screws — torque to the manufacturer spec for the wire size. ## Coordination and backup protection For installations requiring a backup fuse upstream — common when the breaker is installed downstream of a transformer with high fault current — the 3RV2421-1EA10 coordinates with gL/gG fuses rated 32 A at 400 V and 500 V, and 25 A at 690 V. That fuse size is the maximum that still allows the breaker to clear its rated fault current without the fuse blowing first. If your upstream fuse is larger, the breaker's interrupting capacity may be reduced. Maximum switching frequency under AC-3 load is 15 operations per hour — fine for transformer protection where switching is infrequent, but not rated for frequent motor starting cycles.","metaTitle":"Siemens 3RV2421-1EA10 SIRIUS Circuit Breaker, 100 kA at 400","metaDescription":"Siemens 3RV2421-1EA10 SIRIUS circuit breaker for transformer protection. 100 kA SCCR at 400 V, Trip Class 10, DIN rail mount. Current lifecycle stage, 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":"3RV2421-1EA10","Height":"97 mm","Upwards":"50 mm","Forwards":"0 mm","at 400 V":"gL/gG 32 A","at 500 V":"gL/gG 32 A","at 690 V":"gL/gG 25 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 2.8...4 A Short-circuit release 82 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 DIN 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":"0.33 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"4 A","at 500 V rated value":"100 kA","at 600 V rated value":"4 A","at 690 V rated value":"4 kA","Design Of The Product":"For transformer protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"0.13 hp","at 200/208 V rated value":"0.8 hp","at 220/230 V rated value":"0.75 hp","at 460/480 V rated value":"2 hp","at 575/600 V rated value":"3 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":"6 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":"4 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":"4 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"4 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 (Operating 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":"82 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":"2.8 ... 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/38568deef3090096afe44764041b5045.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1135054&mlfb=3RV2421-1EA10"},"ai":{"faq":[{"question":"Does 3RV2421-1EA10 include ground fault detection?","answer":"No, ground fault detection is not built into this variant. Phase failure detection is included."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2421-1EA10","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/3RV2421-1EA10 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}}