{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4AA20-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4AA20-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4AA20-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA20-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4AA20-0BA0, S0 frame, Trip Class 10, spring-loaded terminals, 25 kA breaking capacity at 400 V AC, phase failure detection, 45 mm wide.","salesMarkdown":"The interrupting ratings are given for both ultimate (Icu) and service (Ics) breaking capacity across voltages. At 400 V AC, the rated ultimate breaking capacity is 25 kA, and the service breaking capacity is 55 kA — the higher Ics figure at the same voltage indicates this breaker can clear faults repeatedly without derating, which matters for high-fault locations like motor control centers fed by large transformers. At 240 V AC, the Icu is 100 kA and Ics is 100 kA, so it holds up even on low-voltage distribution with high available fault current. The gG fuse backup ratings are also specified: at 400 V, the maximum gG fuse is 63 A; at 500 V it drops to 50 A; at 690 V to 40 A. These values define the upstream fuse limit for selective coordination. Ground fault detection is not included; that function would need an external residual-current device or a separate ground-fault relay. The spring-loaded terminals are the main-circuit connection type. The screwdriver shaft diameter is 3 mm, and the tip size is 3.0 x 0.5 mm — a standard Pozidriv or slotted bit. Clearance distances: 50 mm upwards, 50 mm downwards, 30 mm at the sides, and 0 mm forwards and backwards. The zero forward/backward clearance means the breaker can be mounted flush against the back panel or enclosure wall, saving depth in shallow enclosures.","metaTitle":"Siemens 3RV2021-4AA20-0BA0 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens 3RV2021-4AA20-0BA0 SIRIUS motor protection circuit breaker, S0 frame, Trip Class 10, 25 kA breaking capacity at 400 V AC. Phase failure detection, spring-loaded terminals,","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","Forwards":"0 mm","at 400 V":"gG 63 A","at 500 V":"gG 50 A","at 690 V":"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":"-50 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"4 kW","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 500 V rated value":"5 kA","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 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":"500","at AC in hot operating state":"9.25 W","at AC-3 at 400 V rated value":"16 A","Of Auxiliary Contacts Typical":"500","Substance Prohibitance (Date)":"10/01/2009","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"16 A","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":"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 (1 ... 6 mm²)","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","Finely Stranded Without Core End Processing":"2x (1 ... 6 mm²)","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":"500","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":"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":null,"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=616413&mlfb=3RV2021-4AA20-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA20-0BA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2021-4AA20-0BA0?","answer":"This part is sourced to order against an RFQ through our independent distribution network. Availability and current pricing are confirmed at the time of quote — submit an RFQ and we will respond with a firm offer."},{"question":"What is the breaking capacity of 3RV2021-4AA20-0BA0 at 400 V?","answer":"At 400 V AC, the rated ultimate breaking capacity (Icu) is 25 kA, and the service breaking capacity (Ics) is 55 kA. The higher Ics figure means the breaker can clear multiple faults without replacement in most applications."},{"question":"Will 3RV2021-4AA20-0BA0 drop into a panel specified for 3RV2021-4CA25?","answer":"Both are S0 frame breakers with the same 45 mm width and DIN-rail mounting, so the physical footprint is identical. The key difference is the terminal type: the 3RV2021-4AA20-0BA0 uses spring-loaded terminals, while the 3RV2021-4CA25 uses screw-type terminals. If the panel wiring was designed for screw clamps, the spring-loaded version will still fit mechanically, but verify the conductor cross-section and stripping length match the spring-clamp specification (2x 1–10 mm² solid/stranded). No rewiring of the panel layout is required."},{"question":"What compliance documentation is available for 3RV2021-4AA20-0BA0?","answer":"As a Siemens SIRIUS product, the 3RV2021-4AA20-0BA0 carries CE marking for the European market and is designed to meet IEC/EN 60947-4-1 and UL 508 standards. RoHS and REACH declarations are available from Siemens on request. The specific approvals (UL, CSA, CCC) should be confirmed against the latest manufacturer declaration for this order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4AA20-0BA0","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/3RV2021-4AA20-0BA0 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}}