{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4BA25-ZW96","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4BA25-ZW96","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4BA25-ZW96","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4BA25-ZW96","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4BA25-ZW96, 45 mm wide, 25 kA at 400 V, Trip Class 10, phase failure detection, spring-loaded terminals.","salesMarkdown":"It carries a Trip Class 10 characteristic, so it trips within 10 seconds at 7.2× rated current — standard for protecting standard 4-pole motors during start-up. Rated breaking capacity hits 25 kA at 400 V AC, enough to clear a bolted fault on most industrial distribution boards without cascading upstream breakers. Side clearance is 30 mm. Main circuit terminals are spring-loaded, accepting 2 × (0.5 … 2.5 mm²) solid or stranded wire. No screw torque to worry about — strip to the correct length, push in. Auxiliary contacts share the same terminal type where fitted. Short-circuit breaking capacity at 400 V is 25 kA. At 240 V it reaches 100 kA, at 500 V it drops to 5 kA, and at 690 V it is 2 kA. For a 480 V system the continuous current rating is 20 A; at 600 V it is also 20 A. The gL/gG fuse backup ratings at 400 V are 63 A, at 500 V and 690 V are 50 A — relevant when coordinating with upstream fuses for Type 2 coordination.","metaTitle":"Siemens 3RV2021-4BA25-ZW96 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4BA25-ZW96 motor protection circuit breaker. Trip Class 10, 25 kA breaking capacity at 400 V, phase failure detection, spring-loaded terminals. Available to","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":"20 A","at 500 V rated value":"5 kA","at 600 V rated value":"20 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":"5 hp","at 460/480 V rated value":"10 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":"20 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":"20 A","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"20 A","Design Of The Short-Circuit Trip":"magnetic","for AWG cables for main contacts":"2x (18 ... 8)","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 AC in hot operating state per pole":"3.5 W","for AWG cables for auxiliary contacts":"2x (20 ... 14)","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":"260 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":"13 ... 20 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=806722&mlfb=3RV2021-4BA25-ZW96","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4BA25-ZW96/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2021-4BA25-ZW96 and get a price?","answer":"This part is sourced through independent distribution and is quoted to order against an RFQ. Submit a request for quote; availability and current pricing are confirmed at that time."},{"question":"What is the closest functional second-source to 3RV2021-4BA25-ZW96?","answer":"The 3RV2021-4CA25 is a close functional peer in the same SIRIUS frame size and Trip Class 10. The key difference is the terminal type: the -4BA25 uses spring-loaded terminals, while the -4CA25 uses screw terminals. Panel footprint and breaking capacity are identical, so it drops into the same DIN-rail slot without rewiring the bus bars — only the wire terminations change."},{"question":"What is the depth of 3RV2021-4BA25-ZW96?","answer":"The listed depth is 97 mm."},{"question":"What is the width of 3RV2021-4BA25-ZW96?","answer":"The listed width is 45 mm."},{"question":"Will 3RV2021-4BA25-ZW96 drop into a panel specified around 3RV2021-4CA25 without rewiring?","answer":"Yes — the physical footprint (45 mm width, 97 mm depth, 35 mm DIN rail) and breaking capacity (25 kA at 400 V) are shared between the two order codes. The only difference is the terminal type: spring-loaded on the -4BA25 versus screw on the -4CA25. Bus bars and DIN-rail mounting are identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4BA25-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/3RV2021-4BA25-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}}