{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-0KA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-0KA10","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-0KA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-0KA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, motor protection circuit breaker, 3RV2021-0KA10, Class 10, 100 kA breaking capacity at 400 V AC, screw-type terminals.","salesMarkdown":"It combines a circuit breaker and overload relay in one device, sized for protecting three-phase motors against short-circuit and overload conditions. Rated for a switching frequency of 15 operations per hour at AC-3 duty (and AC-3e), it handles the typical start-stop cycles of conveyors, pumps, and compressors without overheating the bimetal trip. The 100 kA breaking capacity at 400 V AC (and at 240 V, 500 V, and 690 V AC) means this breaker can safely interrupt a fault current up to 100,000 A at those voltages without welding its contacts or rupturing the arc chamber. At 230 V it is rated for 0.2 kW motor protection, which translates roughly to a 0.25 hp motor at that voltage. At 460/480 V the rating is 1 hp; at 575/600 V it drops to 0.5 hp. The 1.25 A setting at 480 V and 600 V confirms this is a small-motor breaker — sized for fractional-horsepower drives, not main feeders. Storage range of -50 to +80 °C means the spare can sit in a cold toolbox or hot truck without damage. Main circuit terminals are screw-type, accepting 2×(1 to 2.5 mm²) or 2×(2.5 to 10 mm²) solid or stranded wire. The main contact screw is M4, requiring a 5 to 6 mm diameter screwdriver shaft. These are standard panel-building specs — no special tooling needed. The closest functional peer is the 3RV1011-1HA10, which shares the same SIRIUS motor-protection class and Class 10 trip characteristic. The 3RV2021-0KA10 is the 45 mm wide frame; the 3RV1011-1HA10 is a different frame size. They are not drop-in interchangeable — verify the mounting footprint and terminal layout before substituting on an existing panel layout. For a new design, either works; for a retrofit, measure the existing cutout.","metaTitle":"Siemens 3RV2021-0KA10 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens SIRIUS 3RV2021-0KA10 motor protection circuit breaker, Class 10 trip, 100 kA breaking capacity at 400 V, current production status. Sourced to order.","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":"3RV2021-0KA10","Height":"97 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 0.9...1.25 A N-release 16 A screw 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 DIN rail according to DIN EN 60715","at AC-3e maximum":"15 1/h","For Main Contacts":"M4","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"0.2 kW","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"1.25 A","at 500 V rated value":"100 kA","at 600 V rated value":"1.25 A","at 690 V rated value":"100 kA","Design Of The Product":"For motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","at 460/480 V rated value":"1 hp","at 575/600 V rated value":"0.5 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":"100 kA","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"Pozidriv size 2","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":"1.25 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":"1.25 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"1.25 A","Design Of The Short-Circuit Trip":"magnetic","for AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 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":"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 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 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","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","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":"16 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":"0.9 ... 1.25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$80.00","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=524262&mlfb=3RV2021-0KA10"},"ai":{"faq":[{"question":"What is the breaking capacity of the 3RV2021-0KA10 at 400 V?","answer":"It is rated for 100 kA at 400 V AC, which is a high-fault rating for a 45 mm wide motor protection breaker."},{"question":"What is the trip class of this breaker?","answer":"Class 10, meaning it will trip within 10 seconds at 7.2 times the thermal setting current — standard for protecting standard induction motors."},{"question":"Does the 3RV2021-0KA10 detect phase failure?","answer":"Yes, phase failure detection is built in, protecting the motor from single-phasing conditions."},{"question":"What are the mounting clearances required?","answer":"50 mm above and below, 30 mm to the side, zero forward/backward clearance. Mounting position is any, on 35 mm DIN rail per DIN EN 60715."},{"question":"What wire sizes does the main terminal accept?","answer":"Screw-type terminals accepting 2×(1 to 2.5 mm²) or 2×(2.5 to 10 mm²) solid or stranded wire, with an M4 screw requiring a 5 to 6 mm screwdriver shaft."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-0KA10","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/3RV2021-0KA10 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}}