{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-0KA25","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-0KA25","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-0KA25","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-0KA25","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-0KA25, 100 kA interrupting at 400 V, Class 10, spring-loaded terminals, 45 x 119 x 97 mm, screw and snap-on 35 mm DIN rail.","salesMarkdown":"## Motor protection circuit breaker, SIRIUS series — 3RV2021-0KA25 Trip Class 10 means the overload element opens within 10 seconds at 7.2× the thermal setting, matching standard IEC motor starting profiles for pumps, fans, and light conveyors. The main current circuit uses spring-loaded terminals, accepting 2x (0.5... 2.5 mm²) solid or stranded copper — no screw torque check needed on the power connections. Mounting is screw-and-snap onto 35 mm DIN rail per DIN EN 60715; the 45 mm width matches the standard SIRIUS compact footprint, leaving room for auxiliary contact blocks or a separate contactor alongside. ## Panel fit & environment The 45 mm width and 97 mm depth let it drop into a standard 35 mm DIN-rail enclosure with room for a 3-pole contactor on the same rail. Operating temperature range is -20 to +60 °C, storage -50 to +80 °C — fine for most indoor industrial panels; no special derating needed for ambient up to 60 °C.","metaTitle":"Siemens 3RV2021-0KA25 SIRIUS Motor Protection CB, 100 kA @ 4","metaDescription":"Siemens 3RV2021-0KA25 SIRIUS motor protection circuit breaker, 100 kA SCCR at 400 V, Class 10 trip, spring terminals, DIN rail mount. Current lifecycle — 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","Height":"119 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","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","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 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":"spring-loaded 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 3 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"3,0 x 0,5 mm","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","Design Of The Short-Circuit Trip":"magnetic","for AWG cables for main contacts":"2x (18 ... 8)","For Auxiliary And Control Circuit":"spring-loaded 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 AC in hot operating state per pole":"2.4 W","for AWG cables for auxiliary contacts":"2x (20 ... 14)","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)","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","with low demand rate according to SN 31920":"50 FIT","Finely Stranded Without Core End Processing":"2x (0.5 ... 1.5 mm²)","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","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":null,"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=267293&mlfb=3RV2021-0KA25","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-0KA25/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2021-0KA25 and how do I get a price?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current availability and pricing — stock and lead time are confirmed at quote time."},{"question":"Will 3RV2021-0KA25 drop into a panel specified around 3RV1011-0GA10 without rewiring?","answer":"Both are 45 mm wide SIRIUS motor protection breakers on the same DIN-rail footprint, so the mechanical fit is direct. However, the 3RV2021-0KA25 uses spring-loaded terminals while the 3RV1011-0GA10 uses screw terminals — you will need to verify the conductor termination method matches your panel wiring practice."},{"question":"What compliance documentation does this brand provide for 3RV2021-0KA25?","answer":"As a standard SIRIUS catalog part, Siemens provides the usual EU Declaration of Conformity (CE), UKCA, and the product datasheet with IEC/EN ratings. RoHS and REACH compliance declarations are available through the Siemens Industry Online Support portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-0KA25","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/3RV2021-0KA25 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}}