{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4DA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4DA40","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4DA40","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4DA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, motor protection circuit breaker, 3RV2021-4DA40, CLASS 10, 45 mm width, 25 kA at 400 V, ring cable lug connection.","salesMarkdown":"The 45 mm width keeps the rail density high; you can pack several of these into a standard 600 mm panel section. At 690 V the interrupting capacity drops to 2 kA — that's the limit for 690 V motor circuits; don't assume the 400 V rating carries over. The CLASS 10 trip means it opens within 10 seconds at 7.2× the thermal setting — standard for most general-purpose motor starting, but if you have a high-inertia load that needs a longer acceleration ramp, CLASS 10 may nuisance-trip and you'd step up to CLASS 20. The 3RV2021-4DA40 uses ring cable lug connections on the main circuit — M4 screws. That means you need a crimp tool and ring terminals, not just ferrules. Clearance: 50 mm above and below, 30 mm to the side, zero forwards or backwards. That zero forwards clearance is handy for shallow enclosures — the breaker doesn't stick out past the DIN rail. Temperature compensation is built in for the -20 to +60 °C operating range, so the trip curve stays accurate across the panel's ambient swing.","metaTitle":"Siemens 3RV2021-4DA40 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-4DA40 SIRIUS motor protection circuit breaker, CLASS 10 trip, 45 mm wide, 25 kA at 400 V. Sourced to order against RFQ. Current lifecycle status: active production.","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 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 standard mounting rail according to DIN EN 60715","For Main Contacts":"M4","Mounting Position":"any","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":"Ring cable lug connection","Temperature Compensation":"-20 ... +60 °C","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 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":"10.5 W","at AC-3 at 400 V rated value":"25 A","Of Auxiliary Contacts Typical":"100 000","Substance Prohibitance (Date)":"10/01/2009","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 Auxiliary And Control Circuit":"ring terminal lug connection","Between Main And Auxiliary Circuit":"400 V","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":"3.5 W","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 (Switching 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":"325 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","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=24146&mlfb=3RV2021-4DA40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4DA40/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 3RV2021-4DA40 and how is it quoted for volume purchases?","answer":"This part is sourced through independent distribution channels. Availability and current pricing are confirmed at quote time against an RFQ — no firm stock or price can be stated here, but we can source it to order."},{"question":"What is the closest functional second-source to 3RV2021-4DA40?","answer":"The 3RV2023-4DA10 is a peer in the same SIRUS family, but it's a different frame size — check the width and clearance specs before assuming a drop-in swap. The 3RV2021-4DA40 is 45 mm wide; the 3RV2023-4DA10 is wider and may not fit the same DIN rail slot without re-spacing."},{"question":"Will 3RV2021-4DA40 drop into a panel that was specified around 3RV2023-4DA10 without rewiring?","answer":"Not without checking dimensions. The 3RV2021-4DA40 is 45 mm wide; the 3RV2023-4DA10 is a different frame size. The mounting rail is the same 35 mm DIN, but the side clearance and lug positions may differ. Verify the panel layout before ordering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4DA40","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/3RV2021-4DA40 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}}