{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4DA20-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4DA20-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4DA20-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4DA20-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4DA20-0BA0, S0 frame, Class 10, 25 kA breaking capacity at 400 VAC, screw and snap-on DIN rail mount.","salesMarkdown":"It carries a Trip Class 10 rating, meaning it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors during a locked-rotor event without nuisance tripping on normal starts. Breaking capacity is 25 kA at 400 VAC and 50 kA at 240 VAC, which covers most industrial panel fault levels up to that range. At 690 VAC the interrupting rating drops to 2 kA, so verify the available fault current if feeding a 690 V motor circuit. No ground fault detection on this variant. The S0 frame footprint is 45 mm wide × 97 mm deep × 119 mm tall — a standard panel cutout for this class. Keep that in mind when laying out multiple breakers in a row — the 30 mm side gap is the tightest constraint. Main circuit connections use spring-loaded terminals that accept 2× (1 to 10 mm²) solid or stranded wire. A 3 mm diameter screwdriver shaft is specified for the terminal screws.","metaTitle":"Siemens 3RV2021-4DA20-0BA0 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens 3RV2021-4DA20-0BA0 SIRIUS motor protection circuit breaker, S0 frame, Class 10 trip, 25 kA breaking at 400 VAC, screw and snap-on DIN rail mount. Sourced to order.","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 50 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":"5.5 kW","at 240 V rated value":"25 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":"50 kA","at AC at 400 V rated value":"50 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":"10.5 W","at AC-3 at 400 V rated value":"25 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":"25 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":"3.5 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":"325 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":"18 ... 25 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=616414&mlfb=3RV2021-4DA20-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4DA20-0BA0/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV2021-4DA20-0BA0 drop into a panel specified around 3RV2021-4CA25 without rewiring?","answer":"Yes, both parts share the same S0 frame footprint (45 mm wide), DIN rail mount, and spring-loaded terminal connections. A panel wired for the 4CA25 can accept the 4DA20-0BA0 without rewiring."},{"question":"What is 3RV2021-4DA20-0BA0's listed depth?","answer":"The depth is 97 mm, measured from the DIN rail mounting surface to the front of the breaker body."},{"question":"What is 3RV2021-4DA20-0BA0's listed width?","answer":"The width is 45 mm, which is the standard S0 frame width for this SIRIUS series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4DA20-0BA0","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/3RV2021-4DA20-0BA0 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}}