{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2421-4CA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2421-4CA15","canonicalUrl":"https://aoctrl.com/siemens/3RV2421-4CA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2421-4CA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2421-4CA15, for transformer protection, CLASS 10 trip, 25 kA breaking capacity at 400 V, 45 mm width, screw and snap-on DIN rail mounting.","salesMarkdown":"Rated breaking capacity sits at 25 kA at 400 V, backed by 63 A gL/gG fuse coordination at the same voltage. That SCCR handles most industrial transformer secondary faults without cascading upstream. Width is 45 mm, depth 97 mm, height 97 mm — a standard 45 mm modular device that snaps onto 35 mm DIN rail per DIN EN 60715. Screw and snap-on mounting means it locks in place without tools and releases with a screwdriver push. Clearance: 50 mm upwards, 50 mm downwards, 30 mm at the side. Mounting position is any orientation. Main contact terminals accept 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²) — screw terminals, M4 thread. The 45 mm width keeps the per-feeder density tight on a DIN rail; you can pack multiple units side by side within the clearance envelope. ## Operating conditions Rated operational voltage spans 20 to 690 V. Maximum switching frequency under AC-3 or AC-3e duty is 15 operations per hour. Auxiliary contact ratings: 1 A at 24 V, 0.5 A at 120/125/230 V, 0.15 A at 60 V. The auxiliary contact block uses the same M4 screw terminals as the main contacts.","metaTitle":"Siemens 3RV2421-4CA15 SIRIUS Circuit Breaker, Transformer Pr","metaDescription":"Siemens 3RV2421-4CA15 SIRIUS circuit breaker for transformer protection. CLASS 10 trip, 25 kA at 400 V, phase failure detection. 45 mm wide, DIN rail mount. Sourced to order agains","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":"3RV2421-4CA15","Height":"97 mm","Upwards":"50 mm","at 24 V":"1 A","at 60 V":"0.15 A","Forwards":"0 mm","at 120 V":"0.5 A","at 125 V":"0.5 A","at 230 V":"0.5 A","at 400 V":"gL/gG 63 A","at 500 V":"gL/gG 50 A","at 690 V":"gL/gG 50 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 16...22 A N-release 364 A screw terminal Standard switching capacity with transverse auxiliary switches 1 NO+1 NC","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"3 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"22 A","at 500 V rated value":"5 kA","at 600 V rated value":"22 A","at 690 V rated value":"2 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":"1.5 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 hp","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"55 kA","at AC at 500 V rated value":"10 kA","at AC at 690 V rated value":"4 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":"10.5 W","at AC-3 at 400 V rated value":"22 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":"22 A","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"22 A","Design Of The Short-Circuit Trip":"magnetic","for AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Handle","Surge Voltage Resistance Rated Value":"6 kV","Of The Auxiliary And Control Contacts":"M3","at AC in hot operating state per pole":"3.5 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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":"1","number of NO contacts for auxiliary contacts":"1","shock resistance according to IEC 60068-2-27":"25g / 11 ms","Electrical Endurance (Operating Cycles) Typical":"100 000","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","Size Of Contactor Can Be Combined Company-Specific":"S00, S0","contact rating of auxiliary contacts according to UL":"C300 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"Fuse gL/gG: 10 A, miniature circuit breaker C 6 A (short-circuit current Ik < 400 A)","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"364 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":"16 ... 22 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3f4f522628173203183df360e041a1b8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=294349&mlfb=3RV2421-4CA15"},"ai":{"faq":[{"question":"Where can I buy 3RV2421-4CA15 and get current pricing?","answer":"The 3RV2421-4CA15 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional alternative to 3RV2421-4CA15?","answer":"The closest peer is the 3RV1011-1HA10, also a SIRIUS circuit breaker. The key difference is the 3RV2421-4CA15 is designed specifically for transformer protection, while the 3RV1011-1HA10 is a general-purpose motor-protective breaker. The 3RV2421-4CA15 also carries a higher 25 kA breaking capacity at 400 V versus the 3RV1011-1HA10's lower SCCR. Panel fit is not identical — verify mounting dimensions and terminal layout before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2421-4CA15","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/3RV2421-4CA15 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}}