{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4NA20-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4NA20-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4NA20-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA20-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker 3RV2021-4NA20-ZX95, CLASS 10 trip, 45 mm width, 100 kA breaking capacity at 240 V AC, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"## Motor Protection Circuit Breaker — SIRIUS 3RV2021-4NA20-ZX95 It is part of the SIRIUS modular system, integrating with contactors and overload relays on a common DIN rail for coordinated motor starting. Trip class CLASS 10 means it will trip within 10 seconds at 7.2× the current setting, which is the standard for standard-duty motor starting — adequate for most pump, fan, and conveyor applications where the starting transient is under 10 seconds. Rated for a rated insulation voltage of 20... 690 V, with a short-circuit breaking capacity of 100 kA at 240 V AC, 25 kA at 400 V, 5 kA at 500 V, and 2 kA at 690 V. This gives the panel designer selectivity headroom at the lower voltages common in industrial control panels. For compliance documentation, the SIRIUS series carries RoHS, REACH, and relevant IEC/EN 60947-2 and 60947-4-1 certifications. The manufacturer provides a Declaration of Conformity and UL/CSA file numbers upon request. ## Integration & Clearance Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the sides, and 0 mm forwards and backwards. This allows dense panel packing — adjacent devices can be mounted flush front-to-back, with only vertical and lateral breathing space for heat dissipation and wiring access. Operating temperature range -20... +60 °C, storage/transport -50... +80 °C.","metaTitle":"Siemens 3RV2021-4NA20-ZX95 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4NA20-ZX95 motor protection circuit breaker, CLASS 10 trip, 45 mm wide, 100 kA at 240 V. Current lifecycle stage. Quoted to order. Request RFQ.","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=483444&mlfb=3RV2021-4NA20-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA20-ZX95/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RV2021-4NA20-ZX95?","answer":"Submit an RFQ through this listing. We source through authorized distribution and provide a firm quote with availability confirmed at the time of quotation."},{"question":"What is the closest functional alternative to 3RV2021-4NA20-ZX95?","answer":"The 3RV2021-4NA25 is the nearest sibling in the same SIRIUS family — same 45 mm width, same CLASS 10 trip, same 100 kA at 240 V. The -4NA25 has a different current setting range; verify your motor FLA against its adjustment scale before substituting."},{"question":"Will 3RV2021-4NA20-ZX95 drop into a panel specified for 3RV2021-4NA25?","answer":"Yes — both share the same 45 mm width, 97 mm depth, and DIN-rail mounting footprint. The clearance and terminal specifications are identical. The only difference is the current adjustment range; confirm your motor FLA matches the -4NA20-ZX95 scale."},{"question":"What compliance documentation does Siemens provide for 3RV2021-4NA20-ZX95?","answer":"RoHS and REACH declarations, plus IEC/EN 60947-2 and 60947-4-1 certifications. A Declaration of Conformity and UL/CSA file numbers are available on request through the RFQ process."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4NA20-ZX95","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-ZX95 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}}