{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4BA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4BA40","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4BA40","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4BA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4BA40 motor protection circuit breaker, Trip Class 10, 45 mm width, screw and snap-on 35 mm DIN rail mount, phase failure detection, current lifecycle stage.","salesMarkdown":"## Motor Protection Circuit Breaker — SIRIUS 3RV2021-4BA40 It carries a Trip Class 10 rating, meaning it will trip within 10 seconds at a locked-rotor current of 7.2× setting — the standard for standard-duty induction motor starts up to about 15 starts per hour. Breaking capacity is 100 kA at 240 V AC, 25 kA at 400 V, 5 kA at 500 V, and 2 kA at 690 V. At 400 V, the recommended back-up fuse is gL/gG 63 A; at 500 V and 690 V it drops to gL/gG 50 A. This tells you the SCCR your panel can claim when this breaker is the branch-circuit protector — coordination matters upstream. If your motor starter needs GF protection, you'll add a separate module or relay downstream. Any mounting position is allowed. Main circuit connection uses ring cable lugs at M4 screws. Clearance distances: 50 mm upwards and downwards, 30 mm at the side, 0 mm forwards and backwards. That 0 mm backwards means it can sit flush against a backplane or another device — useful in dense panels. ## Environmental and Operational Range Switching frequency at AC-3 and AC-3e maximum duty is 15 operations per hour. For higher-duty-cycle applications like frequent jogging or reversing, a larger frame or contactor-based starter may be necessary. ## Motor Horsepower Ratings This breaker is rated for motor loads at standard North American voltages: 3 hp at 230 V, 5 hp at 220/230 V, 7.5 hp at 200/208 V, and 10 hp at 460/480 V. At 110/120 V it covers 1.5 hp. These are useful for direct cross-reference to NEMA motor tables.","metaTitle":"Siemens 3RV2021-4BA40 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-4BA40 SIRIUS motor protection circuit breaker. Trip Class 10. 100 kA breaking capacity at 240 V AC. Phase failure detection. DIN rail mount. Current lifecycle stage","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 DIN rail according to DIN EN 60715","at AC-3e maximum":"15 1/h","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":"20 A","at 500 V rated value":"5 kA","at 600 V rated value":"20 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","at 110/120 V rated value":"1.5 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 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":"20 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":"20 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"20 A","Design Of The Short-Circuit Trip":"magnetic","For Auxiliary And Control Circuit":"ring terminal lug connection","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","With Side-By-Side Mounting At The Side":"0 mm","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 (Operating 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":"260 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":"13 ... 20 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=448827&mlfb=3RV2021-4BA40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4BA40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source — 3RV2021-4CA25?","answer":"The 3RV2021-4CA25 is a peer in the same SIRIUS 3RV2 frame family. The key difference is the current setting range and Trip Class — verify your motor FLA and start profile against that variant's spec before substituting. The 3RV2021-4BA40 has a 45 mm width and Trip Class 10; the 4CA25 may have a different trip curve or current range."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4BA40","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/3RV2021-4BA40 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}}