{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1021-0KA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1021-0KA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1021-0KA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1021-0KA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV1021-0KA15, 1.25 A continuous rated current, Class 10 trip class, 100 kA breaking capacity at 400 V AC, screw-type terminals, snap-on DIN rail mounting.","salesMarkdown":"The Siemens 3RV1021-0KA15 is a SIRIUS motor protection circuit breaker rated for 1.25 A continuous current with a Class 10 trip characteristic, meaning it protects motors against overload and short circuit by tripping within 10 seconds at 7.2× rated current — fast enough for standard induction motor starts without nuisance tripping. Rated for 690 V AC maximum, it delivers 100 kA breaking capacity across 240 V, 400 V, 500 V, and 690 V AC — sufficient to clear high-fault-current scenarios in industrial distribution without cascading upstream breakers. IP20 front protection means it is touch-safe for the panel interior but not rated for washdown environments. ## Motor Duty and Trip Coordination At 400 V AC-3 duty, this breaker supports a 0.37 kW motor load — the rating that governs real-world motor protection sizing, not the 1.25 A continuous current alone. The 1.25 A continuous rating sets the thermal overload threshold; the 0.37 kW figure tells you what motor frame it protects on a 400 V line. No ground fault detection, so that function must be handled separately downstream. Main circuit terminals accept screw-type connections: solid conductors from 2x (0.5 to 1.5 mm²) up to 2x (0.75 to 2.5 mm²), and stranded conductors from 2x (1 to 2.5 mm²) up to 2x (2.5 to 6 mm²). AWG equivalents for main contacts are 2x (14 to 10). Auxiliary and control circuits also use screw terminals. Auxiliary switch extension is available as a product option, with a transverse design — allows adding a signal contact for remote status indication without replacing the breaker. Shock resistance rated at 25 g for 11 ms — suitable for installation on machinery subject to vibration, such as conveyor drives or compressor skids.","metaTitle":"Siemens 3RV1021-0KA15 SIRIUS Motor Protection CB, 1.25 A, Cl","metaDescription":"Siemens 3RV1021-0KA15 SIRIUS motor protection circuit breaker, 1.25 A continuous, Class 10 trip, 100 kA breaking at 400 V. Active production. Screw/snap-on DIN rail. Quoted to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"96 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"45 mm","Height":"97 mm","at 24 V":"1 A","at 60 V":"0.15 A","Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","at 230 V":"0.5 A","Backwards":"0 mm","Trip Class":"CLASS 10","At The Side":"0 mm","Rated Value":"690 V","During Storage":"-50 ... +80 °C","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 50022","Shock Resistance":"25g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Product Designation":"circuit breaker","at 400 V rated value":"0.37 kW","Design Of The Product":"for motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","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","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"7.25 W","Substance Prohibitance (Date)":"05/01/2012","Continuous Current Rated Value":"1.25 A","Design Of The Auxiliary Switch":"transverse","at AWG cables for main contacts":"2x (14 ... 10)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","operating frequency at AC-3 maximum":"15 1/h","Surge Voltage Resistance Rated Value":"6 000 V","at AWG cables for auxiliary contacts":"2x (18 ... 14)","at AC in hot operating state per pole":"2.4 W","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","Touch Protection Against Electrical Shock":"finger-safe","number of CO contacts for auxiliary contacts":"0","operational current at AC-3 at 400 V rated value":"1.25 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Design Of The Overcurrent Release And Short-Circuit Release":"thermomagnetic","Arrangement Of Electrical Connectors For Main Current Circuit":"front side","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","Mechanical Service Life (Switching Cycles) Of The Main Contacts Typical":"100 000","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.9 ... 1.25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=117776&mlfb=3RV1021-0KA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1021-0KA15/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV1021-0KA15 at 400 V?","answer":"It delivers 100 kA breaking capacity at 400 V AC, the same rating as at 240 V, 500 V, and 690 V AC."},{"question":"Will 3RV1021-0KA15 drop into a panel specified around 3RV1011-0HA10?","answer":"Both are SIRIUS motor protection breakers with similar DIN rail mounting, but the 3RV1011-0HA10 has different current ratings and trip characteristics — verify the continuous current and motor power rating against your load before substituting."},{"question":"What compliance documentation does Siemens provide for 3RV1021-0KA15?","answer":"The product carries a substance prohibitance date of 05/01/2012, indicating RoHS compliance. Standard Siemens documentation includes the declaration of conformity for the relevant EU directives (Low Voltage, EMC) and the manufacturer's declaration for UL/CSA listing where applicable."},{"question":"Where can I buy 3RV1021-0KA15 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial automation distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1021-0KA15","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/3RV1021-0KA15 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}}