{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4DA20-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4DA20-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4DA20-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4DA20-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4DA20-ZX95, Trip Class 10, 100 kA at 240 V, 25 kA at 400 V, spring-loaded terminals, 45 mm wide.","salesMarkdown":"## What it is and where it fits The Siemens 3RV2021-4DA20-ZX95 is a SIRIUS motor protection circuit breaker — the device that sits between your contactor and the motor, combining overload protection and short-circuit interruption in one 45 mm-wide package. It snaps onto 35 mm DIN rail per DIN EN 60715 and terminates with spring-loaded terminals, so no screwdriver torque check after installation. The 97 mm depth means it clears standard 120 mm-deep enclosures with room for wiring behind the rail. ## The ratings that matter for motor duty Trip Class 10 means it will trip within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors from locked-rotor heating, but not so fast it nuisance-trips on normal starting inrush. Phase failure detection is built in: if one phase drops, the breaker opens before single-phasing cooks the winding. At 240 V it interrupts 100 kA; at 400 V that drops to 25 kA — still enough for most industrial panel SCCR requirements. The gL/gG fuse coordination at 400 V is 63 A, meaning upstream fuse sizing is straightforward for selectivity.","metaTitle":"Siemens 3RV2021-4DA20-ZX95 SIRIUS Motor Protection CB, 25 kA","metaDescription":"Siemens SIRIUS 3RV2021-4DA20-ZX95 motor protection circuit breaker, Trip Class 10, 100 kA at 240 V, 25 kA at 400 V. Phase failure detection, spring-loaded terminals, DIN rail mount","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 50 A","at 690 V":"gL/gG 50 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":"3 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"25 A","at 500 V rated value":"5 kA","at 600 V rated value":"25 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":"5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 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":"10.5 W","at AC-3 at 400 V rated value":"25 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":"25 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"25 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":"3.5 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":"325 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":"18 ... 25 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=373061&mlfb=3RV2021-4DA20-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4DA20-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2021-4DA20-ZX95?","answer":"It is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"Will 3RV2021-4DA20-ZX95 drop into a panel specified around 3RV2021-4CA25 without rewiring?","answer":"Both are 45 mm wide SIRIUS motor protection breakers with the same DIN rail footprint and spring-loaded terminals, so the mechanical fit and wiring interface are identical. The difference is in the trip curve and interrupting ratings — verify the 4CA25's specs against your fault current before swapping."},{"question":"What is the depth of 3RV2021-4DA20-ZX95?","answer":"97 mm. That fits standard 120 mm enclosures with clearance for rear wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4DA20-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/3RV2021-4DA20-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}}