{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-1EA20-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-1EA20-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-1EA20-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1EA20-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, 3RV2021-1EA20-0BA0, motor protection circuit breaker, Size S0, 4 A at AC-3 400 V, Trip Class 10, 100 kA breaking capacity, spring-loaded terminals, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"It is rated 4 A at AC-3 duty at 400 V, with a Trip Class 10 characteristic — meaning it will trip within 10 seconds at 7.2× the thermal setting, fast enough to protect standard induction motors during a locked-rotor start. ## DIN-rail fit and wiring The S0 footprint is 45 mm wide by 119 mm tall, with a depth of 97 mm — a tight fit for a 4-pole device in a crowded enclosure. Clearance requirements: 50 mm above and below, 30 mm to the sides, zero forward or backward. ## Breaking capacity and duty ratings That 100 kA figure at 400 V means the breaker can be used on a transformer-fed panel with a high prospective fault current — no need for a current-limiting upstream fuse for SCCR compliance. The AC-3 rating of 4 A at 400 V corresponds to switching a motor load of approximately 0.8 kW at 230 V. The breaker also carries a maximum operating voltage of 690 V AC-3.","metaTitle":"Siemens 3RV2021-1EA20-0BA0 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-1EA20-0BA0 motor protection circuit breaker, 4 A at AC-3 400 V, Trip Class 10, 100 kA breaking capacity, spring-loaded terminals, DIN rail mount. Sourced to","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","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":"0.8 kW","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 500 V rated value":"100 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":"100 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":"7.25 W","at AC-3 at 400 V rated value":"4 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":"4 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":"2.4 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 (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":"52 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":"2.8 ... 4 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=1090916&mlfb=3RV2021-1EA20-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1EA20-0BA0/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV2021-1EA20-0BA0?","answer":"The breaking capacity is 100 kA at 240 V, 400 V, and 500 V AC, dropping to 6 kA at 690 V AC. This allows direct connection to high-fault-current distribution panels without upstream current-limiting fuses."},{"question":"What are the mounting dimensions for 3RV2021-1EA20-0BA0?","answer":"The breaker is 45 mm wide, 119 mm high, and 97 mm deep. It mounts onto 35 mm DIN rail per DIN EN 60715 with screw and snap-on fastening. Clearances: 50 mm above and below, 30 mm to the sides."},{"question":"Where can I buy 3RV2021-1EA20-0BA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-1EA20-0BA0","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/3RV2021-1EA20-0BA0 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}}