{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4FA15-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4FA15-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4FA15-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4FA15-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4FA15-ZX95, Class 10 trip, 45 mm width, screw and snap-on 35 mm DIN rail mounting, for motor protection with phase failure detection.","salesMarkdown":"At 230 V it's rated for 7.5 hp motor load; at 480 V and 600 V the continuous current rating is 40 A. The 70 mm clearance required above and below (and 30 mm to the side) is for arc venting and thermal dissipation; pack it tighter and you lose the interrupting rating. Main circuit terminals are M4 screw-type, accepting 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded copper. Strip length isn't given in the spec, but standard practice for M4 screw terminals on this class is 8–10 mm. The auxiliary contact block (if used) shares the same terminal size.","metaTitle":"Siemens 3RV2021-4FA15-ZX95 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4FA15-ZX95 motor protection circuit breaker, Class 10 trip, 100 kA breaking capacity at 240 V, 45 mm wide, DIN rail mount. Sourced to order against 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":"97 mm","Upwards":"70 mm","at 24 V":"1 A","at 60 V":"0.15 A","Forwards":"0 mm","at 120 V":"0.5 A","at 125 V":"0.5 A","at 230 V":"0.5 A","at 400 V":"gG 63 A","at 500 V":"gG 63 A","at 690 V":"gG 63 A","Backwards":"0 mm","Downwards":"70 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 ... +40 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","For Main Contacts":"M4","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"7.5 hp","at 240 V rated value":"100 kA","at 400 V rated value":"10 kA","at 480 V rated value":"40 A","at 500 V rated value":"3 kA","at 600 V rated value":"40 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":"screw-type terminals","at 110/120 V rated value":"3 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"30 hp","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"20 kA","at AC at 500 V rated value":"6 kA","at AC at 690 V rated value":"3 kA","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"Pozidriv size 2","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"16.25 W","at AC-3 at 400 V rated value":"40 A","Of Auxiliary Contacts Typical":"100 000","Substance Prohibitance (Date)":"10/01/2009","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"40 A","Design Of The Short-Circuit Trip":"magnetic","for AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Handle","Surge Voltage Resistance Rated Value":"6 kV","Of The Auxiliary And Control Contacts":"M3","at AC in hot operating state per pole":"5.4 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","With Side-By-Side Mounting At The Side":"9 mm","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","with high demand rate according to SN 31920":"50 %","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","shock resistance according to IEC 60068-2-27":"25g / 11 ms","Electrical Endurance (Operating Cycles) Typical":"100 000","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","Size Of Contactor Can Be Combined Company-Specific":"S00, S0","contact rating of auxiliary contacts according to UL":"C300 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"Fuse gL/gG: 10 A, miniature circuit breaker C 6 A (short-circuit current Ik < 400 A)","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"480 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":"34 ... 40 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=528535&mlfb=3RV2021-4FA15-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4FA15-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV2021-4FA15-ZX95 drop into a panel specified for 3RV2021-4NA25?","answer":"Both are 45 mm wide SIRIUS motor protection breakers with the same DIN rail footprint and M4 screw terminals. The 4FA15 has a different trip curve and interrupting rating than the 4NA25, but the mechanical fit and wiring are identical — no rewiring needed for the swap."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4FA15-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/3RV2021-4FA15-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}}