{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4EA20-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4EA20-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4EA20-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4EA20-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, size S0, CLASS 10, A-release 27-32 A, N-release 400 A, spring-type terminals, 100 kA breaking capacity at 240 V.","salesMarkdown":"## Motor protection breaker for the wet line It carries a CLASS 10 trip class, meaning it will trip within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during a stalled-rotor start, but not so fast that it nuisance-trips during a normal acceleration. The adjustable overload release covers 27 to 32 A, and the fixed magnetic short-circuit release fires at 400 A. Rated operational current is 32 A, and the breaker handles fault currents up to 100 kA at 240 V, 25 kA at 400 V, 5 kA at 500 V, and 2 kA at 690 V. That 100 kA figure at 240 V is the headline number — it means this breaker can sit upstream of a motor starter on a high-capacity distribution board without needing a current-limiting fuse ahead of it, as long as the prospective short-circuit current at that point stays under 100 kA. The spring-type terminals accept solid or stranded copper up to 10 mm², and the breaker snaps onto a 35 mm DIN rail per DIN EN 60715. It is rated for 500 switching cycles at an ambient temperature down to -50 °C, which covers outdoor or cold-store installations.","metaTitle":"Siemens 3RV2021-4EA20-0BA0 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4EA20-0BA0 motor protection circuit breaker, CLASS 10, 27-32 A adjustable overload, 400 A magnetic short-circuit trip, 100 kA at 240 V. Spring terminals, S0","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Trip Class":"CLASS 10","Rated Value":"20 ... 690 V","lifecycle_stage":"current","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 500 V rated value":"5 kA","at 690 V rated value":"2 kA","Design Of The Product":"For motor protection","at AC at 240 V rated value":"25 kA","at AC at 400 V rated value":"25 kA","at AC at 500 V rated value":"10 kA","at AC at 690 V rated value":"4 kA","Substance Prohibitance (Date)":"10/01/2009","Operational Current Rated Value":"32 A","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"400 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=1448757&mlfb=3RV2021-4EA20-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4EA20-0BA0/alternatives.json"},"ai":{"faq":[{"question":"What is 3RV2021-4EA20-0BA0's trip class?","answer":"It is a CLASS 10 trip class breaker, meaning it will trip within 10 seconds at 7.2× the set overload current — suitable for standard motor starting profiles."},{"question":"What is the breaking capacity of 3RV2021-4EA20-0BA0 at different voltages?","answer":"At 240 V it is rated for 100 kA; at 400 V, 25 kA; at 500 V, 5 kA; and at 690 V, 2 kA. These are the maximum fault currents it can safely interrupt at each voltage level."},{"question":"Where can I buy 3RV2021-4EA20-0BA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quotation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4EA20-0BA0","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/3RV2021-4EA20-0BA0 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}}