{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4NA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4NA20","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4NA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4NA20, motor protection circuit breaker, 45 mm width, Class 10 trip, 25 kA at 400 V, spring-loaded terminals, screw and snap-on 35 mm DIN rail.","salesMarkdown":"It snaps onto 35 mm DIN rail per DIN EN 60715 and accepts spring-loaded terminals for the main current circuit — solid or stranded wire up to 2x 10 mm². The 45 mm width and 97 mm depth fit standard panel layouts, with 50 mm clearance needed above and below, and zero clearance required forwards or backwards. Trip Class 10 means it opens within 10 seconds at 7.2x the thermal setting — standard for general-purpose induction motor starting where the inrush doesn't linger. The interrupting capacity at 400 V is 25 kA, which covers most industrial distribution panels; at 240 V it's 100 kA, and at 690 V it drops to 2 kA. The rated operating voltage spans 20 to 690 V, so it works on 480 V or 600 V systems as well. Maximum switching frequency under AC-3 duty is 15 operations per hour — fine for a conveyor or pump that cycles a few times per shift, not for a rapid-reversing application.","metaTitle":"Siemens 3RV2021-4NA20 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-4NA20 SIRIUS motor protection circuit breaker, 45 mm wide, Class 10 trip, 25 kA at 400 V, spring terminals. Quoted 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":"gL/gG 63 A","at 500 V":"gL/gG 63 A","at 690 V":"gL/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":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","at AC-3e maximum":"15 1/h","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"5 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"28 A","at 500 V rated value":"5 kA","at 600 V rated value":"28 A","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 110/120 V rated value":"2 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"20 hp","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":"100 000","at AC in hot operating state":"13.25 W","at AC-3 at 400 V rated value":"28 A","at AC-3e rated value maximum":"690 V","Of Auxiliary Contacts Typical":"100 000","Substance Prohibitance (Date)":"10/01/2009","at AC-3e at 400 V rated value":"28 A","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","for AWG cables for main contacts":"2x (18 ... 8)","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","with low demand rate according to SN 31920":"50 FIT","Finely Stranded Without Core End Processing":"2x (1 ... 6 mm²)","with high demand rate according to SN 31920":"50 %","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":"100 000","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=119254&mlfb=3RV2021-4NA20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA20/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3RV2021-4NA20 and how is it quoted for volume purchases?","answer":"It is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time."},{"question":"What is 3RV2021-4NA20's listed depth (97 mm) on this component line?","answer":"The listed depth is 97 mm."},{"question":"What is 3RV2021-4NA20's listed width (45 mm) on this component line?","answer":"The listed width is 45 mm."},{"question":"Will 3RV2021-4NA20 drop into a panel that was specified around 3RV2021-4NA25 without rewiring?","answer":"Both are 45 mm wide SIRIUS motor protection breakers with spring terminals and the same DIN-rail footprint, so physical fit is identical. The difference is in the trip setting range and interrupting capacity — verify those against your motor FLA and available fault current before swapping."},{"question":"What compliance documentation does this brand provide for 3RV2021-4NA20 (RoHS, REACH, UL, IEC)?","answer":"As a SIRIUS product, it carries IEC and UL certifications standard for the series. RoHS and REACH declarations are available from Siemens documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4NA20","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 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}}