{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-1KA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-1KA10","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-1KA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1KA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, 3RV2021-1KA10, motor protection circuit breaker, Class 10, 100 kA breaking capacity at 400 V AC, screw terminals, 45 mm width.","salesMarkdown":"## What it is and what it does The Siemens 3RV2021-1KA10 is a SIRIUS motor protection circuit breaker designed specifically for motor protection. It combines a contactor and overload relay in one device, with a Class 10 trip characteristic that matches the thermal curve of standard three-phase induction motors — meaning it will ride through a normal start-up but trip fast enough on a locked rotor to protect the winding. Phase failure detection is built in, so a lost phase on the line side won't cook the motor while the breaker holds current on the remaining two legs. Ground fault detection is not included, so if that's required you'll need an add-on module or a separate ground-fault relay. ## Breaking capacity and coordination This breaker is rated for 100 kA at 240 V AC and 400 V AC, 42 kA at 500 V, and 4 kA at 690 V. Those numbers tell you the maximum fault current it can safely interrupt at each voltage level — critical for SCCR (short-circuit current rating) compliance in a panel. At 480 V the rated operational current is 12.5 A, and the same at 600 V, so it's sized for smaller motor branches (typically up to about 10 hp at 575/600 V). ## Mounting and wiring Mounts on 35 mm DIN rail per DIN EN 60715, using either the snap-on latch or screws. The 45 mm width (three module spaces) fits standard distribution boards. Wiring is via screw terminals on the main circuit; accepts solid or stranded copper up to 2x 10 mm² per terminal, with M4 screws. Any mounting position is allowed, so you can lay it sideways in a tight gland plate if needed. ## Environmental and lifecycle Rated for operation from -20 to +60 °C, storage and transport from -50 to +80 °C. The lifecycle stage is marked as current production, so this is a standard catalog item — no end-of-life notice, no last-time-buy pressure. It's a fast mover in the SIRIUS line, and we source it to order against an RFQ.","metaTitle":"Siemens 3RV2021-1KA10 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-1KA10 SIRIUS motor protection circuit breaker, Class 10 trip, 100 kA breaking capacity at 400 V AC, screw terminals, DIN rail mount. Current production. Submit 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","title":"3RV2021-1KA10","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 9...12.5 A N-release 163 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":"2 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"12.5 A","at 500 V rated value":"42 kA","at 600 V rated value":"12.5 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":"screw-type terminals","at 110/120 V rated value":"0.5 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"8 hp","at 575/600 V rated value":"10 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":"42 kA","at AC at 690 V rated value":"6 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":"9.25 W","at AC-3 at 400 V rated value":"12.5 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":"12.5 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"12.5 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 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":"3.1 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":"163 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":"9 ... 12.5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$93.00 – $130.67","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=91287&mlfb=3RV2021-1KA10"},"ai":{"faq":[{"question":"What is the breaking capacity at 400 V AC?","answer":"100 kA at 400 V AC, which covers most industrial distribution panels up to that voltage level."},{"question":"Does this breaker detect phase failure?","answer":"Yes, phase failure detection is built in. Ground fault detection is not included."},{"question":"What is the mounting method?","answer":"Screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715. Any mounting position is allowed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-1KA10","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/3RV2021-1KA10 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}}