{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4AA20-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4AA20-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4AA20-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA20-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4AA20-ZX95, motor protection circuit breaker, size S0, CLASS 10, adjustable current release 10…16 A, instantaneous short-circuit trip 208 A, spring-type terminals, standard switching capacity.","salesMarkdown":"## Motor protection breaker, S0 frame, 16 A It combines a thermal overload relay and a magnetic short-circuit trip in one device, saving panel space over a separate contactor-and-relay pair. Rated operational current is 16 A, with an adjustable thermal overload release covering 10…16 A. The instantaneous short-circuit trip responds at 208 A, which coordinates with downstream contactors and starters to clear faults before they damage the load. For motors with longer acceleration times (high-inertia loads), a CLASS 20 or CLASS 30 breaker would be required. Rated short-circuit breaking capacity is specified per IEC 60947-2 across the voltage range: 100 kA at 240 V AC, 55 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. The 55 kA at 400 V gives substantial SCCR headroom for most industrial distribution panels without requiring upstream current-limiting fuses. ## Termination and mounting Accepts 0.5…2.5 mm² solid or stranded, or 0.5…1.5 mm² finely stranded with ferrule. Side-by-side mounting with zero spacing is permitted at rated current, so no derating for ganging. The product carries RoHS compliance with a substance prohibition date of 10/01/2009, indicating it meets the EU RoHS directive. The SIRIUS series is UL/CSA listed and CE marked for the European market.","metaTitle":"Siemens 3RV2021-4AA20-ZX95 SIRIUS Motor Protection Breaker,","metaDescription":"Siemens SIRIUS 3RV2021-4AA20-ZX95 motor protection circuit breaker, CLASS 10, 16 A adjustable, 55 kA at 400 V AC. 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=1357103&mlfb=3RV2021-4AA20-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA20-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class of 3RV2021-4AA20-ZX95?","answer":"Trip Class CLASS 10 — trips within 10 seconds at 7.2× the set current, suitable for standard motor starting."},{"question":"What is the rated voltage range for this breaker?","answer":"Rated value is 20…690 V AC, covering 240 V, 400 V, 500 V, and 690 V industrial networks."},{"question":"Will 3RV2021-4AA20-ZX95 drop into a panel wired for 3RV2021-4CA25?","answer":"Both are S0 frame breakers with the same 45 mm width, same mounting pattern, and same spring-terminal technology. The 3RV2021-4AA20-ZX95 is rated 16 A (10…16 A adjustable) versus the 4CA25 at 22 A (16…22 A adjustable). If the circuit is sized for 16 A or less, it is a direct mechanical and electrical swap. For a 22 A circuit, the 4CA25 or the 4NA25 (28 A) would be the correct replacement."},{"question":"Where can I buy 3RV2021-4AA20-ZX95 and how is it quoted?","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."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4AA20-ZX95","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-ZX95 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}}