{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-1CA20-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-1CA20-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-1CA20-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1CA20-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-1CA20-0BA0, size S0, Class 10 trip class, 100 kA breaking capacity at 400 V AC, spring-loaded terminals, screw and snap-on DIN rail mounting.","salesMarkdown":"## Motor protection circuit breaker, SIRIUS 3RV2021-1CA20-0BA0 The backup fuse recommendation is gG 25 A at 400 V and 500 V, stepping down to gG 20 A at 690 V. That fuse size is the maximum allowed to preserve the breaker's 100 kA rating; a larger fuse would shift the let-through energy above what the breaker can interrupt. Compared to the smaller-frame 3RV2011-0BA20, the 3RV2021-1CA20-0BA0 is the size S0 variant with higher continuous current capacity and the same 100 kA interrupting rating. The 3RV2011-0BA20 is a size S00 breaker with a lower thermal setting range; the 3RV2021-1CA20-0BA0 will not drop into a panel wired for S00 without adjusting the DIN rail mounting clips and terminal spacing. The spring-loaded terminals on this unit are screwless — the S00 sibling often uses screw terminals — so the wiring method differs. Use a screwdriver with a 3 mm shaft diameter and a 3.0 x 0.5 mm tip to open the clamp — push in, insert the stripped conductor (8-10 mm strip length), release. The 50 mm clearance above and below is for cable bending radius; the 30 mm side clearance is for neighboring devices or auxiliary contact blocks. For a motor feeder that needs ground-fault protection, add an external ground-fault relay or use a 3RV2 variant with the GF option. The rated operating voltage range is 20 to 690 V, covering 24 V control transformers up to 690 V line supplies. The maximum switching frequency at AC-3 duty is 15 operations per hour — adequate for a motor start once every four minutes, not for jogging or rapid cycling.","metaTitle":"Siemens 3RV2021-1CA20-0BA0 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens 3RV2021-1CA20-0BA0 SIRIUS motor protection circuit breaker, size S0, Class 10 trip, 100 kA breaking capacity at 400 V AC. Spring-loaded terminals, DIN rail mount. Active pr","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","Forwards":"0 mm","at 400 V":"gG 25 A","at 500 V":"gG 25 A","at 690 V":"gG 20 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":"-50 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"0.4 kW","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 500 V rated value":"100 kA","at 690 V rated value":"10 kA","Design Of The Product":"For motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"spring-loaded 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":"10 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":"500","at AC in hot operating state":"7.25 W","at AC-3 at 400 V rated value":"2.5 A","Of Auxiliary Contacts Typical":"500","Substance Prohibitance (Date)":"10/01/2009","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"2.5 A","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":"2.4 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 ... 6 mm²)","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","Finely Stranded Without Core End Processing":"2x (1 ... 6 mm²)","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":"500","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":"33 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":"1.8 ... 2.5 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=1029623&mlfb=3RV2021-1CA20-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-1CA20-0BA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2021-1CA20-0BA0 and get a price?","answer":"The 3RV2021-1CA20-0BA0 is 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 is the closest functional second-source to 3RV2021-1CA20-0BA0?","answer":"The closest functional peer is the 3RV2011-0BA20, which is the size S00 version of the same SIRIUS motor protection breaker family. The 3RV2021-1CA20-0BA0 is size S0 with a higher continuous current range and the same 100 kA interrupting rating at 400 V. The S00 variant uses screw terminals; this unit uses spring-loaded terminals. They are not drop-in interchangeable — the mounting footprint and terminal spacing differ."},{"question":"What are the clearance requirements for 3RV2021-1CA20-0BA0?","answer":"The breaker requires 50 mm clearance above and below for cable bending, 30 mm at the sides for neighboring devices or auxiliary contacts, and zero clearance forwards or backwards. The overall dimensions are 45 mm width, 97 mm depth, and 119 mm height."},{"question":"Will 3RV2021-1CA20-0BA0 drop into a panel wired for 3RV2011-0BA20?","answer":"No. The 3RV2021-1CA20-0BA0 is size S0, which is physically larger than the S00 frame of the 3RV2011-0BA20. The DIN rail mounting clips are positioned differently, and the terminal spacing does not match. Rewiring and possibly a new DIN rail mounting position are required."},{"question":"What compliance documentation does Siemens provide for 3RV2021-1CA20-0BA0?","answer":"Siemens provides a declaration of conformity for the SIRIUS 3RV2 series covering the Low Voltage Directive (2014/35/EU) and EMC Directive (2014/30/EU). The breaker carries CE marking and is designed to meet IEC 60947-2 and IEC 60947-4-1. RoHS and REACH compliance declarations are available from Siemens Industry Support. UL and CSA approvals are standard for the 3RV2 family, though specific file numbers should be verified against the nameplate marking on the unit received."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-1CA20-0BA0","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/3RV2021-1CA20-0BA0 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}}