{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-1KA20-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-1KA20-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-1KA20-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1KA20-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-1KA20-0BA0, motor protection circuit breaker, size S0, Trip Class 10, 100 kA SCCR at 400 V AC, spring-loaded terminals, phase failure detection.","salesMarkdown":"At 500 V the SCCR holds at 42 kA, and at 690 V it is 4 kA (AC) or 6 kA (AC depending on the cited entry), so the part is best deployed on 400 V or 480 V systems where its full interrupting capability is available. ## Termination and panel integration Clearance requirements: 50 mm above and below, 30 mm to the side, zero forward or backward — so it fits tightly against a back panel or enclosure wall. The screwdriver shaft for the terminal clamps is 3 mm diameter, tip size 3.0 × 0.5 mm.","metaTitle":"Siemens 3RV2021-1KA20-0BA0 SIRIUS Motor Protection CB, Class","metaDescription":"Siemens SIRIUS 3RV2021-1KA20-0BA0 motor protection circuit breaker, size S0, Trip Class 10, 100 kA SCCR at 400 V AC. Spring-loaded terminals, phase failure detection. Current produ","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":"3 kW","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 500 V rated value":"42 kA","at 690 V rated value":"4 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":"100 kA","at AC at 500 V rated value":"42 kA","at AC at 690 V rated value":"6 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":"12.5 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":"12.5 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":"163 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":"9 ... 12.5 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=762828&mlfb=3RV2021-1KA20-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1KA20-0BA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RV2021-1KA20-0BA0 and get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"What is the short-circuit breaking capacity of this breaker?","answer":"100 kA at 400 V AC, 42 kA at 500 V AC, and 4 kA (or 6 kA per one entry) at 690 V AC. The 100 kA rating at 400 V is the headline figure for panel coordination."},{"question":"Does this breaker include phase failure protection?","answer":"Yes, phase failure detection is built in. A lost phase on the line side will cause the breaker to trip, protecting the motor from single-phasing."},{"question":"What are the mounting dimensions and clearances?","answer":"Width 45 mm, depth 97 mm, height 119 mm. Requires 50 mm clearance above and below, 30 mm to the side, zero forward or backward. Mounts on 35 mm DIN rail per DIN EN 60715."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-1KA20-0BA0","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/3RV2021-1KA20-0BA0 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}}