{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4NA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4NA40","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4NA40","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4NA40 motor-protective circuit breaker, Class 10 trip, 45 mm width, screw and snap-on DIN-rail mount, 25 kA at 400 V.","salesMarkdown":"## Motor-protective circuit breaker for 400 V panels At 480 V the rated current is 28 A; at 500 V the breaking capacity drops to 5 kA, and at 690 V to 2 kA. That derating curve matters when you're specifying for a 480 V line or a 690 V drive input. Clearance: 50 mm above and below, 30 mm to the side, 0 mm forward or backward — so you can butt it against the backplane or a busbar without extra spacing. Main-circuit connection uses ring cable lugs on M4 screws — no spring-cage option here. Phase-failure detection is built in; ground-fault detection is not, so if you need GF protection you'll add an external module or a separate ground-fault relay. No EOL notice or successor has been issued for this order code.","metaTitle":"Siemens 3RV2021-4NA40 SIRIUS Motor-Protective Circuit Breake","metaDescription":"Siemens 3RV2021-4NA40 SIRIUS motor-protective circuit breaker, Class 10 trip, 45 mm wide, screw and snap-on DIN-rail mount. Breaking capacity 25 kA at 400 V. Current lifecycle stag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"97 mm","Width":"45 mm","Height":"97 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","For Main Contacts":"M4","Mounting Position":"any","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":"Ring cable lug connection","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 5 to 6 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"size 2 and Pozidriv 2","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 Auxiliary And Control Circuit":"ring terminal lug connection","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Handle","For Main Contacts For Ring Cable Lug":"2 ... 2.5 N·m","Surge Voltage Resistance Rated Value":"6 kV","Of The Auxiliary And Control Contacts":"M3","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","Number Of Poles For Main Current Circuit":"3","For Auxiliary Contacts For Ring Cable Lug":"1.2 ... 0.8 N·m","Product Function Short Circuit Protection":"Yes","with low demand rate according to SN 31920":"50 FIT","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","Outer Diameter Of The Usable Ring Cable Lug Maximum":"7.5 mm","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=406980&mlfb=3RV2021-4NA40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA40/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV2021-4NA40 drop into a panel that was specified around 3RV2021-4NA25 without rewiring?","answer":"Both are 45 mm wide SIRIUS motor-protective circuit breakers with the same DIN-rail mounting and M4 ring-lug connections, so the mechanical and electrical footprint is identical. The difference is in the trip setting and breaking capacity — check your specific overload curve and fault current requirements before swapping."},{"question":"What compliance documentation does this brand provide for 3RV2021-4NA40 (RoHS, REACH, UL, IEC)?","answer":"Siemens SIRIUS products typically carry UL, CSA, CE, and IEC certifications. Specific documentation (RoHS, REACH, UL file number) is available from the manufacturer's support portal or upon request with the RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4NA40","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/3RV2021-4NA40 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}}