{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4AA25","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4AA25","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4AA25","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA25","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4AA25, Trip Class 10, 25 kA breaking capacity at 400 V, 2 hp at 230 V, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"## Motor protection circuit breaker for 35 mm DIN rail Rated operating voltage spans 20 to 690 V, covering low-voltage motor circuits from 24 V control transformers up to 690 V industrial mains. Breaking capacity reaches 100 kA at 240 V, 25 kA at 400 V, 5 kA at 500 V, and 2 kA at 690 V — sufficient for most distribution-side fault levels without upstream fuses. Ground fault detection is not included; that requires an add-on module or separate ground-fault relay. Solid or stranded wire: 2 × (0.5 to 2.5 mm²). Mounting position is any orientation. Minimum clearances to adjacent metalwork: 50 mm upwards and downwards, 30 mm at the sides, 0 mm forwards and backwards. ## Switching capacity and fuse coordination Maximum back-up fuse ratings for short-circuit coordination: gL/gG 63 A at 400 V, 50 A at 500 V, 40 A at 690 V. Maximum switching frequency in AC-3 duty is 15 operations per hour — sized for motor starting cycles, not continuous load switching. Motor power rating: 2 hp at 230 V. Auxiliary contact ratings: 1 A at 24 V, 0.5 A at 120/125/230 V, 0.15 A at 60 V.","metaTitle":"Siemens 3RV2021-4AA25 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-4AA25 SIRIUS motor protection circuit breaker. Trip Class 10, 25 kA breaking capacity at 400 V, 2 hp at 230 V. Screw and snap-on 35 mm DIN rail mounting. Phase fail","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","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 50 A","at 690 V":"gL/gG 40 A","Backwards":"0 mm","Downwards":"50 mm","Trip Class":"CLASS 10","At The Side":"30 mm","Rated Value":"20 ... 690 V","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":"2 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"16 A","at 500 V rated value":"5 kA","at 600 V rated value":"16 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":"1 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 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":"9.25 W","at AC-3 at 400 V rated value":"16 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":"16 A","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"16 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":"3.1 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":"208 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":"10 ... 16 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$48.26","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=21682&mlfb=3RV2021-4AA25","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA25/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RV2021-4AA25?","answer":"The 3RV2021-4CA25 is a close peer within the same SIRIUS family. Both share the same 45 mm width, Trip Class 10, and DIN rail mounting. The key difference is the 3RV2021-4CA25 has a higher breaking capacity at 400 V (100 kA vs 25 kA for the 4AA25), making it suitable for installations with higher available fault current. The 4AA25 is the standard-duty version; the 4CA25 is the high-breaking-capacity variant. Both use the same terminal technology and clearance requirements, so they are mechanically interchangeable in the same panel footprint."},{"question":"Will 3RV2021-4AA25 drop into a panel specified around 3RV2021-4CA25 without rewiring?","answer":"Yes — both share the same 45 mm width, 97 mm depth, 119 mm height, and screw/snap-on DIN rail mounting. Terminal types and wire ranges are identical. The swap is a straight mechanical replacement; no rewiring or panel modification needed. The only difference is the lower breaking capacity (25 kA vs 100 kA at 400 V), so verify the available fault current at the installation point does not exceed 25 kA."},{"question":"What compliance documentation does Siemens provide for 3RV2021-4AA25?","answer":"As a SIRUS motor protection circuit breaker, this part carries CE marking for the European market and is designed to meet IEC/EN 60947-2 and 60947-4-1 standards. RoHS and REACH compliance declarations are available from Siemens on request. UL/CSA listings are typical for this series but should be confirmed against the specific catalog number for the target jurisdiction."},{"question":"Where can I buy 3RV2021-4AA25 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4AA25","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/3RV2021-4AA25 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}}