{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-0KA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-0KA15","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-0KA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-0KA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-0KA15, Class 10 trip, 100 kA breaking capacity at 400 V, screw terminals, DIN rail mount.","salesMarkdown":"## Motor protection circuit breaker for panel integration It occupies a 45 mm wide footprint on the rail, with a depth of 97 mm and height of 97 mm. The breaker includes phase failure detection, so a lost phase on the line side will trip the motor off, preventing single-phasing damage. Breaking capacity is 100 kA at 400 V, 500 V, and 690 V, and also at 240 V. ## Motor power and current ratings Rated for a 0.2 kW motor at 230 V, 1 hp at 460/480 V, and 0.5 hp at 575/600 V. The auxiliary contact block handles 1 A at 24 V, 0.5 A at 120/125/230 V, and 0.15 A at 60 V. Maximum operating frequency is 15 switching cycles per hour in AC-3 and AC-3e duty — sufficient for typical conveyor or pump start-stop cycles, not for high-speed jogging. Mounting position is any orientation. Required clearances: 50 mm upwards and downwards, 30 mm at the sides, 0 mm forwards and backwards — meaning it can be stacked against the back panel and adjacent devices without side gaps, as long as vertical breathing space is maintained. Screw-type terminals on the main current circuit accept 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded wire. Main contact screws are M4.","metaTitle":"Siemens 3RV2021-0KA15 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-0KA15 SIRIUS motor protection circuit breaker, Class 10 trip, 100 kA breaking capacity at 400 V. Phase failure detection, screw terminals, DIN rail mount. Available","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":"3RV2021-0KA15","Height":"97 mm","Upwards":"50 mm","at 24 V":"1 A","at 60 V":"0.15 A","Forwards":"0 mm","at 120 V":"0.5 A","at 125 V":"0.5 A","at 230 V":"0.5 A","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 with transverse auxiliary switches 1 NO+1 NC","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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 Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"1.25 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","Design Of The Short-Circuit Trip":"magnetic","For Auxiliary And Control Circuit":"screw-type terminals","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 AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Of The Auxiliary And Control Contacts":"M3","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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":"1","number of NO contacts for auxiliary contacts":"1","shock resistance according to IEC 60068-2-27":"25g / 11 ms","Electrical Endurance (Operating Cycles) Typical":"100 000","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","Size Of Contactor Can Be Combined Company-Specific":"S00, S0","contact rating of auxiliary contacts according to UL":"C300 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"Fuse gL/gG: 10 A, miniature circuit breaker C 6 A (short-circuit current Ik < 400 A)","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":"$40.64","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=312603&mlfb=3RV2021-0KA15"},"ai":{"faq":[{"question":"What is the breaking capacity of the 3RV2021-0KA15?","answer":"100 kA at 240 V, 400 V, 500 V, and 690 V. This is the rated short-circuit breaking capacity per IEC 60947-2."},{"question":"What trip class is the 3RV2021-0KA15?","answer":"Class 10. It will trip within 10 seconds at 7.2× the thermal current setting, matching standard induction motor starting profiles."},{"question":"Does the 3RV2021-0KA15 include phase failure protection?","answer":"Yes, phase failure detection is built in. It will trip the motor off if one phase is lost, preventing single-phasing damage."},{"question":"What are the mounting clearances for the 3RV2021-0KA15?","answer":"50 mm upwards and downwards, 30 mm at the sides, 0 mm forwards and backwards. It can be mounted against the back panel and adjacent devices with no side gaps."},{"question":"Where can I buy the 3RV2021-0KA15 and get current pricing?","answer":"This part is sourced and quoted to order through independent distribution. Submit an RFQ for current pricing and availability confirmation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-0KA15","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/3RV2021-0KA15 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}}