{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-1BA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-1BA20","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-1BA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1BA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor-protection circuit breaker, Size S0, 3RV2021-1BA20, 100 kA breaking capacity at 400 V AC, Trip Class 10, spring-loaded terminals, screw and snap-on DIN-rail mount.","salesMarkdown":"The Siemens 3RV2021-1BA20 is a SIRIUS motor-protection circuit breaker in the Size S0 frame, designed to protect motor branch circuits against overload and short circuit. ## Breaking capacity and what it means for your panel At 400 V AC this breaker interrupts fault currents up to 100 kA — that is the SCCR (short-circuit current rating) that governs whether the device can clear a bolted fault without rupturing. The same 100 kA holds at 240 V and 500 V AC; at 690 V it still handles 10 kA. That rating is what the panel designer uses to verify the branch circuit withstands the available fault current. The breaker measures 45 mm wide, 119 mm tall, and 97 mm deep. Mounting position is any orientation. For thermal derating, Siemens calls for 50 mm clearance above and below the device and 30 mm to the side; no clearance needed forward or backward. That matters when you are packing breakers into a shallow enclosure — the 97 mm depth plus wiring space is the dimension that decides gland-plate depth.","metaTitle":"Siemens 3RV2021-1BA20 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-1BA20 SIRIUS motor-protection circuit breaker, Size S0, 100 kA breaking capacity at 400 V AC, Trip Class 10, screw and snap-on DIN-rail mount. Sourced to order agai","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","title":"3RV2021-1BA20","Height":"119 mm","Upwards":"50 mm","Forwards":"0 mm","Backwards":"0 mm","Downwards":"50 mm","Trip Class":"CLASS 10","At The Side":"30 mm","Rated Value":"20 ... 690 V","description":"Circuit breaker size S0 for motor protection, CLASS 10 A-release 1.4...2 A N-release 26 A Spring-type terminal Standard switching capacity","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","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":"0.13 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"2 A","at 500 V rated value":"100 kA","at 600 V rated value":"2 A","at 690 V rated value":"10 kA","Design Of The Product":"For motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"spring-loaded terminals","at 460/480 V rated value":"1 hp","at 575/600 V rated value":"1 hp","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"100 kA","at AC at 500 V rated value":"100 kA","at AC at 690 V rated value":"10 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":"7.25 W","at AC-3 at 400 V rated value":"2 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":"2 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"2 A","at AWG cables for main contacts":"2x (18 ... 8)","Design Of The Short-Circuit Trip":"magnetic","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":"2.4 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 ... 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 (Switching 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":"26 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":"1.4 ... 2 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"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=498085&mlfb=3RV2021-1BA20"},"ai":{"faq":[{"question":"What is the breaking capacity of the 3RV2021-1BA20 at 400 V?","answer":"At 400 V AC the breaker is rated for 100 kA interrupting capacity. The same 100 kA applies at 240 V and 500 V AC; at 690 V it drops to 10 kA."},{"question":"Will the 3RV2021-1BA20 drop into a panel built for the 3RV2011-0BA20?","answer":"Both are Size S0 breakers with the same 45 mm width and 35 mm DIN-rail mounting, so they share the same panel footprint and rail slot. The 3RV2021-1BA20 uses spring-loaded terminals; the 3RV2011-0BA20 uses screw terminals, so the wiring method differs. Verify the terminal type matches your existing lugs before swapping."},{"question":"How do I get current pricing and availability for the 3RV2021-1BA20?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability — both are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-1BA20","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/3RV2021-1BA20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}