{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4EA25","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4EA25","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4EA25","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4EA25","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4EA25 motor protection circuit breaker, 45 mm width, 25 kA at 400 V, Class 10 trip, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"## What it is and what it does The Siemens 3RV2021-4EA25 is a SIRIUS motor protection circuit breaker designed for protecting three-phase motors against overload, short-circuit, and phase failure. It snaps onto a 35 mm DIN rail per DIN EN 60715 and uses spring-loaded terminals for the main current circuit, saving panel wiring time. ## Key ratings and what they mean for your panel Rated breaking capacity of 25 kA at 400 V means this breaker can safely interrupt fault currents up to that level without upstream fuses needing to clear first — critical for SCCR compliance on a motor branch circuit. Trip Class 10 means the bimetal releases within 10 seconds at 7.2× the thermal setting, matching the typical locked-rotor withstand of standard induction motors. Phase failure detection is built in, so a lost leg trips the breaker rather than letting the motor single-phase. The 45 mm width (3 module spaces) and 97 mm depth fit standard 600 mm deep enclosures. Mounting position is any, so vertical or horizontal DIN rail orientation works. Clearance: 50 mm above and below, 30 mm at the sides for arc venting and heat dissipation.","metaTitle":"Siemens 3RV2021-4EA25 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-4EA25 SIRIUS motor protection circuit breaker, 25 kA at 400 V, Class 10 trip, 45 mm wide, DIN rail mount. Sourced to order against RFQ.","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":"3RV2021-4EA25","Height":"119 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 63 A","at 690 V":"gL/gG 63 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 motor protection, CLASS 10 A-release 27...32 A N-release 400 A Spring-type 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","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"5 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"32 A","at 500 V rated value":"5 kA","at 600 V rated value":"32 A","at 690 V rated value":"2 kA","Design Of The Product":"For motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"2 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"20 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 3 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"3,0 x 0,5 mm","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"13.25 W","at AC-3 at 400 V rated value":"32 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":"32 A","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"32 A","at AWG cables for main contacts":"2x (18 ... 8)","Design Of The Short-Circuit Trip":"magnetic","For Auxiliary And Control Circuit":"spring-loaded 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","at AWG cables for auxiliary contacts":"2x (20 ... 14)","at AC in hot operating state per pole":"4.4 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 (0.5 ... 1.5 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","Finely Stranded Without Core End Processing":"2x (0.5 ... 1.5 mm²)","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","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":"400 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":"27 ... 32 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$68.58","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/69e3aae776a3a972c11948ccacc118a3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=255771&mlfb=3RV2021-4EA25"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RV2021-4EA25?","answer":"The 3RV2021-4NA25 is the closest peer — same 45 mm width, same Class 10 trip, same 25 kA at 400 V rating. The difference is in the auxiliary contact configuration; check your control circuit wiring before substituting."},{"question":"Will 3RV2021-4EA25 drop into a panel specified around 3RV2021-4NA25 without rewiring?","answer":"Yes, the footprint is identical — both use the same 45 mm width, snap onto 35 mm DIN rail, and share the same terminal layout for the main circuit. The spring-loaded terminals accept the same 2x (0.5 to 2.5 mm²) conductors."},{"question":"What compliance documentation does Siemens provide for 3RV2021-4EA25?","answer":"As a standard SIRIUS catalog product, Siemens provides RoHS and REACH declarations, along with UL, CSA, and IEC certifications. Full documentation is available upon request with an RFQ."},{"question":"Where can I buy 3RV2021-4EA25 and how is it quoted?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for your volume and delivery window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4EA25","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/3RV2021-4EA25 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}}