{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4NA20-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4NA20-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4NA20-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA20-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4NA20-0BA0, Class 10 trip, 10 kA breaking capacity at 400 V AC, screw and snap-on DIN rail mounting.","salesMarkdown":"## Motor protection circuit breaker for 35 mm DIN rail Rated operational voltage spans 20 to 690 V AC, with a maximum AC-3 switching frequency of 15 operations per hour. The 3RV2021-4NA20-0BA0 carries a rated ultimate short-circuit breaking capacity (Icu) of 10 kA at 400 V AC, 5 kA at 500 V AC, and 2 kA at 690 V AC. For coordination with an upstream MCCB or fuse, the conditional short-circuit current (Ics) is higher: 25 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC — these are the values used when the breaker is backed by a gG 63 A fuse (the evidence lists gG 63 A at 400 V, 500 V, and 690 V). This means the breaker can be installed downstream of a 63 A gG fuse and still clear a fault up to 25 kA at 400 V without the fuse needing to open. Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm to the side, and 0 mm forwards/backwards — so it can be panel-mounted flush against the backplane. The S0 frame size (45 mm width, 97 mm depth, 119 mm height) is the standard footprint for this class of Siemens motor-protective device.","metaTitle":"Siemens 3RV2021-4NA20-0BA0 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4NA20-0BA0 motor protection circuit breaker, Class 10 trip, 10 kA breaking capacity at 400 V AC. Screw and snap-on DIN rail mounting. Available 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 63 A","at 690 V":"gG 63 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":"7.5 kW","at 240 V rated value":"10 kA","at 400 V rated value":"10 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":"25 kA","at AC at 400 V rated value":"25 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":"13.25 W","at AC-3 at 400 V rated value":"28 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":"28 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":"4.4 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":"364 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":"23 ... 28 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=616415&mlfb=3RV2021-4NA20-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA20-0BA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RV2021-4NA20-0BA0?","answer":"The closest functional peer within the same SIRIUS S0 family is the 3RV2021-4NA25. Both share the same S0 frame size, Class 10 trip, and DIN rail mounting. The key difference is the 4NA25 variant carries a higher breaking capacity — verify the specific fault-current requirements of your installation before substituting."},{"question":"Will 3RV2021-4NA20-0BA0 drop into a panel specified around 3RV2021-4NA25 without rewiring?","answer":"Yes — both are S0 frame size with identical 45 mm width, 97 mm depth, and 119 mm height, and both use spring-loaded terminals accepting 2× (1 to 10 mm²). The mounting hole pattern and DIN rail clip are the same. No rewiring or panel modification is needed for the swap."},{"question":"What compliance documentation does Siemens provide for 3RV2021-4NA20-0BA0?","answer":"As a standard Siemens SIRIUS product, the 3RV2021-4NA20-0BA0 is supplied with a declaration of conformity to IEC/EN 60947-2 and 60947-4-1. RoHS and REACH compliance declarations are available on request. The product carries CE marking for the European market; UL/CSA listings are typical for the SIRIUS range but should be confirmed against the specific variant's nameplate."},{"question":"Where can I buy 3RV2021-4NA20-0BA0 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/3RV2021-4NA20-0BA0","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/3RV2021-4NA20-0BA0 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}}