{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4NA10-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4NA10-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4NA10-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA10-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4NA10-ZX95, Class 10 trip, 25 kA breaking capacity at 400 V, screw-type terminals, DIN rail mount.","salesMarkdown":"Its Trip Class 10 thermal overload curve matches standard motor starting profiles, so it will not nuisance-trip during a normal start but still clears a stalled rotor before the motor windings overheat. Any mounting position is permitted, so it can be laid flat in a shallow enclosure or stood vertically without derating. Terminal capacity is 2x (1…2.5 mm²) or 2x (2.5…10 mm²) solid or stranded, accepting both control wiring and motor power conductors directly without intermediate terminal blocks. ## Short-circuit coordination Breaking capacity is rated at 25 kA at 400 V, 100 kA at 240 V, 5 kA at 500 V, and 2 kA at 690 V. The 25 kA at 400 V is the figure that governs most European 400 V distribution panels — it allows Type 1 or Type 2 coordination with downstream contactors without needing upstream fuses for fault currents below that threshold. The 100 kA at 240 V covers North American 240 V delta systems where available fault current can be high.","metaTitle":"Siemens 3RV2021-4NA10-ZX95 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4NA10-ZX95 motor protection circuit breaker, Class 10 trip, 25 kA breaking capacity at 400 V. Current lifecycle stage. 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":"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","Solid Or Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 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":"screw-type 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 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":"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)":"03/01/2017","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 (16 ... 12), 2x (14 ... 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 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 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":"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=418052&mlfb=3RV2021-4NA10-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4NA10-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3RV2021-4NA10-ZX95 and how is it quoted for volume purchases?","answer":"This part is sourced through independent distribution channels and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock or price figures are published here."},{"question":"When sourcing 3RV2021-4NA10-ZX95, what's the closest functional second-source — 3RV2021-4NA25?","answer":"The 3RV2021-4NA25 is a sibling in the same SIRIUS motor protection circuit breaker family. The main difference is the overload setting range — confirm the specific motor FLA on your BOM before substituting. Both share the same 45 mm width, DIN rail mount, and Class 10 trip curve, so they will drop into the same panel footprint without rewiring."},{"question":"Will 3RV2021-4NA10-ZX95 drop into a panel that was specified around 3RV2021-4NA25 without rewiring?","answer":"Yes. Both parts share the same 45 mm width, DIN rail mounting, screw-type terminals, and terminal capacity, so the physical footprint and wiring are identical. The only difference is the overload setting range — verify that the range covers your motor FLA before swapping."},{"question":"What compliance documentation does this brand provide for 3RV2021-4NA10-ZX95 (RoHS, REACH, UL, IEC)?","answer":"As a Siemens SIRUS product designed per IEC standards, it carries CE marking and is UL/CSA listed for the North American market. RoHS and REACH compliance declarations are available from Siemens on request. The specific UL file number is not listed in this evidence, but the breaking capacities at 240 V and 480 V confirm UL 489 listing for the US market."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4NA10-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/3RV2021-4NA10-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}}