{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-1EA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-1EA20","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-1EA20","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1EA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-1EA20 motor protection circuit breaker, Trip Class 10, 100 kA SCCR at 400 V AC, 45 mm wide, screw and snap-on DIN rail mount, spring-loaded terminals.","salesMarkdown":"The 3RV2021-1EA20: Trip Class 10 means it will trip within 10 seconds at 7.2× the thermal setting current — fast enough to protect standard induction motors during a locked-rotor event without nuisance tripping on normal startup inrush. That's full-rated SCCR for most industrial panels — no need for upstream current-limiting fuses unless the available fault current exceeds 100 kA. The breaker also includes phase failure detection — if one phase drops out, it trips the motor offline before single-phasing cooks the winding. Depth is 97 mm, height 119 mm. Any mounting position is allowed. Clearance requirements: 50 mm upwards and downwards, 30 mm at the sides, zero forwards or backwards. That side clearance is tighter than some competing breakers — good for dense panels, but verify if you're stacking multiple units side-by-side without derating. No screw-clamp torque to check — just strip, insert, and the cage clamps. Saves time on the wireman's end of the panel build. ## Environmental and duty limits Maximum switching rate at AC-3 duty (motor starting) is 15 operations per hour. That's typical for a motor-protection breaker — it's not designed for high-cycling jogging or reversing service. If the application needs frequent starts, look at the contactor's rating; the breaker is the backup, not the workhorse.","metaTitle":"Siemens 3RV2021-1EA20 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-1EA20 SIRIUS motor protection circuit breaker, Trip Class 10, 100 kA SCCR at 400 V AC, 45 mm wide, screw and snap-on DIN rail mount. 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":"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","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":"0.33 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"4 A","at 500 V rated value":"100 kA","at 600 V rated value":"4 A","at 690 V rated value":"4 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":"0.13 hp","at 200/208 V rated value":"0.8 hp","at 220/230 V rated value":"0.75 hp","at 460/480 V rated value":"2 hp","at 575/600 V rated value":"3 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":"6 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":"4 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":"4 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"4 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 (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":"52 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":"2.8 ... 4 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=444990&mlfb=3RV2021-1EA20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1EA20/alternatives.json"},"ai":{"faq":[{"question":"What is the short-circuit breaking capacity of the 3RV2021-1EA20?","answer":"100 kA at 240 V AC, 100 kA at 400 V AC, and 100 kA at 500 V AC. At 690 V AC it drops to 4 kA. That 100 kA figure at common industrial voltages means it can be used as the main branch protection without upstream current-limiting fuses in most panels."},{"question":"Will the 3RV2021-1EA20 fit on a 35 mm DIN rail?","answer":"Yes, it mounts via screw fixing or snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width is the standard SIRIUS compact frame."},{"question":"Where can I buy the 3RV2021-1EA20?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."},{"question":"What is the difference between the 3RV2021-1EA20 and the 3RV1011-0GA10?","answer":"The 3RV2021-1EA20 is the current-production SIRIUS compact frame (45 mm wide,) with spring-loaded terminals and 100 kA SCCR at 400 V. The 3RV1011-0GA10 is an older SIRIUS frame — physically similar DIN footprint but screw terminals and a lower SCCR rating. The 3RV2021-1EA20 will drop into a panel wired for the 3RV1011-0GA10 if the DIN rail position and clearance (50 mm up/down, 30 mm sides) match, but the terminal type differs: spring-clamp vs screw, so verify the lug adapter if reusing ring terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-1EA20","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/3RV2021-1EA20 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}}