{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1021-1KA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1021-1KA15","canonicalUrl":"https://aoctrl.com/siemens/3RV1021-1KA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1021-1KA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1021-1KA15, motor-protective circuit breaker, 12.5 A rated continuous current, CLASS 10 trip class, 100 kA breaking capacity at 400 V AC, screw terminals, snap-on DIN rail mount.","salesMarkdown":"The Siemens 3RV1021-1KA15 is a SIRIUS motor-protective circuit breaker rated for 12.5 A continuous current with a CLASS 10 trip curve, sized for a 5.5 kW motor at 400 V AC. Snaps onto a 35 mm DIN rail per EN 50022 and accepts screw-type terminals for the main circuit — 2x (0.5…1.5 mm²) solid or 2x (1…2.5 mm²) stranded, with the larger 2.5…6 mm² stranded for heavier feeds. The auxiliary switch is transverse-mounted and field-addable; the part ships without one, but the extension slot is ready. Zero clearance needed at the sides or rear, so it packs tight in a crowded panel. ## Breaking capacity by voltage — the real derating story The 100 kA SCCR holds at 240 V and 400 V AC, then drops to 42 kA at 500 V and 6 kA at 690 V.","metaTitle":"Siemens 3RV1021-1KA15 SIRIUS Motor Circuit Breaker, 12.5 A,","metaDescription":"Siemens 3RV1021-1KA15 SIRIUS motor-protective circuit breaker. 12.5 A continuous, CLASS 10 trip, 100 kA SCCR at 400 V. Current production. Quoted to order.","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 DIN 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":"5.5 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":"42 kA","at AC at 690 V rated value":"6 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"9.25 W","Substance Prohibitance (Date)":"05/01/2012","Continuous Current Rated Value":"12.5 A","Design Of The Auxiliary Switch":"transverse","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":"3.1 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":"12.5 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 (Operating Cycles) Of The Main Contacts Typical":"100 000","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"9 ... 12.5 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=55190&mlfb=3RV1021-1KA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1021-1KA15/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — the 3RV1011-1HA10?","answer":"The 3RV1011-1HA10 is a physically smaller frame (S00 vs S0) with a lower 10 A rating and a lower breaking capacity. The 3RV1021-1KA15 will not drop into a panel wired for the 3RV1011-1HA10 without rewiring the main power terminals and checking the DIN-rail space — the S0 frame is 45 mm wide versus 45 mm on the S00, so width matches, but the terminal layout and lug sizes differ. Stick with the 3RV1021-1KA15 for the 12.5 A, 100 kA spec."},{"question":"Where can I buy the 3RV1021-1KA15 and get current pricing?","answer":"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 price and lead time."},{"question":"What compliance documentation does this part carry?","answer":"RoHS compliance (substance prohibition date May 1, 2012), 6 kV surge voltage resistance rating, and IP20 protection on the front. The SIRIUS series typically carries UL, CSA, and CE approvals, but verify the specific certification markings on the nameplate for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1021-1KA15","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/3RV1021-1KA15 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}}