{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4CA25","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4CA25","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4CA25","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4CA25","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4CA25, motor protection circuit breaker, 22 A rated current, 25 kA breaking capacity at 400 V, Class 10 trip class, spring-loaded terminals, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"## Motor Protection Circuit Breaker, 22 A, Class 10 The Siemens SIRIUS 3RV2021-4CA25 is a motor protection circuit breaker rated for 22 A at 480 V and 600 V, with a breaking capacity of 25 kA at 400 V. Spring-loaded terminals accept 2× (0.5 to 2.5 mm²) solid or stranded copper, which saves panel-wiring time compared to screw-clamp variants. Auxiliary contact ratings cover control voltages from 24 V (1 A) up to 690 V (gL/gG 50 A), so the same block can signal a PLC input at 24 VDC or switch a contactor coil at 230 VAC without derating. ## Clearing Clearances and Panel Fit Required clearances for heat dissipation: 50 mm above and below, 30 mm to the side, 0 mm forward and backward. The zero forward/backward clearance means the breaker can be mounted flush against a back panel or enclosure door without derating — a common gotcha on other breakers that demand 10–20 mm of breathing room. Breaking capacity varies by voltage: 100 kA at 240 V, 25 kA at 400 V, 5 kA at 500 V, and 2 kA at 690 V. At 400 V — the most common industrial distribution voltage — 25 kA covers the vast majority of panel SCCR requirements (a typical MCC main bus is rated 25 kA or 35 kA). If your facility runs 480 V, the 22 A continuous rating matches a 7.5 hp motor at 460 V. The maximum switching rate is 15 operations per hour under AC-3 duty (starting and stopping a squirrel-cage motor). That's fine for a conveyor or pump that cycles a few times an hour; for a jogging or inching application that needs 100+ starts per hour, step up to a contactor with a higher mechanical life.","metaTitle":"Siemens 3RV2021-4CA25 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-4CA25 SIRIUS motor protection circuit breaker, 22 A rated, 25 kA breaking capacity at 400 V, Class 10 trip, spring-loaded terminals. Active production. Sourced to o","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","at 400 V":"gL/gG 63 A","at 500 V":"gL/gG 50 A","at 690 V":"gL/gG 50 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":"3 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"22 A","at 500 V rated value":"5 kA","at 600 V rated value":"22 A","at 690 V rated value":"2 kA","Design Of The Product":"For motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"1.5 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 hp","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"55 kA","at AC at 500 V rated value":"10 kA","at AC at 690 V rated value":"4 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":"10.5 W","at AC-3 at 400 V rated value":"22 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":"22 A","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"22 A","at AWG cables for main contacts":"2x (18 ... 8)","Design Of The Short-Circuit Trip":"magnetic","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 AWG cables for auxiliary contacts":"2x (20 ... 14)","at AC in hot operating state per pole":"3.5 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)","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":"286 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":"16 ... 22 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$52.46","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=108844&mlfb=3RV2021-4CA25","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4CA25/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2021-4CA25 and how do I get a price?","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":"Will 3RV2021-4CA25 drop into a panel specified around 3RV2023-4DA10 without rewiring?","answer":"Both are 45 mm wide SIRIUS breakers on the same DIN-rail footprint, so the mechanical swap is direct. However, 3RV2021-4CA25 uses spring-loaded terminals while the 3RV2023-4DA10 uses screw-type terminals — if the existing wiring has ferrules or solid conductors, the spring clamp works fine; if the panel was wired with bare stranded wire without ferrules, you may need to add ferrules or trim the strands for the spring cage."},{"question":"What compliance documentation does this brand provide for 3RV2021-4CA25?","answer":"Siemens SIRIUS products typically carry UL, CSA, CE, and CCC certifications. Specific documentation (declaration of conformity, RoHS/REACH statements) is available from Siemens Industry Online Support or through the distributor upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4CA25","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/3RV2021-4CA25 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}}