{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4AA20-ZW96","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4AA20-ZW96","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4AA20-ZW96","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA20-ZW96","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, motor protection circuit breaker, size S0, 16 A, CLASS 10, spring-type terminal, standard switching capacity, 3RV2021-4AA20-ZW96.","salesMarkdown":"## What this breaker does on the line The interrupting rating varies sharply with system voltage, and that's the number that decides whether this breaker coordinates with your upstream protection. At 240 V AC it clears 100 kA; at 400 V AC it's rated 55 kA; at 500 V AC it drops to 10 kA; at 690 V AC it's 4 kA. The DC ratings are lower: 25 kA at 400 V, 5 kA at 500 V, 2 kA at 690 V. For a 400 V panel fed from a transformer with 65 kA available fault current, this breaker needs an upstream current-limiting device — it won't self-protect. The auxiliary contact block (1 NO + 1 NC) is rated C300 / R300 per UL, fine for signaling a PLC input or dropping out a contactor coil. The spring-type terminals accept 2 × (0.5...2.5 mm²) solid or stranded, or 2 × (0.5...1.5 mm²) finely stranded with ferrules. Combines directly with S00 and S0 contactors from the same SIRIUS family.","metaTitle":"Siemens 3RV2021-4AA20-ZW96 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4AA20-ZW96 motor protection circuit breaker, 16 A, CLASS 10, 100 kA at 240 V. Active production. Quoted to order against RFQ.","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":"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","Substance Prohibitance (Date)":"10/01/2009","Operational Current Rated Value":"16 A","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"208 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=1357102&mlfb=3RV2021-4AA20-ZW96","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA20-ZW96/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV2021-4AA20-ZW96 drop into a panel specified for 3RV2021-4CA25?","answer":"Yes, the physical footprint is identical — both are S0 frame, 45 mm wide, snap onto 35 mm DIN rail, use spring terminals, and mount at 0 mm side clearance. The difference is the adjustment range: this breaker covers 10...16 A, while the 4CA25 covers 16...22 A."},{"question":"What compliance documentation does this breaker carry?","answer":"The RoHS compliance date is 10/01/2009. The auxiliary contacts carry UL ratings of C300 / R300. The breaker is designed to IEC and UL standards for motor protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4AA20-ZW96","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/3RV2021-4AA20-ZW96 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}}