{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4BA25-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4BA25-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4BA25-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4BA25-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4BA25-ZX95, motor protection circuit breaker, Class 10, 25 kA at 400 V, phase failure detection, spring-loaded terminals, 45 x 97 x 119 mm.","salesMarkdown":"## Motor protection breaker for the SIRIUS line The Siemens SIRIUS 3RV2021-4BA25-ZX95 is a motor protection circuit breaker designed to clear overloads and short circuits in motor branch circuits. It carries a 25 kA SCCR at 400 V AC, which means it can safely interrupt a fault current up to that level without upstream fuses or breakers needing to clear first — that is the rating that decides coordination in a panel. Trip Class 10 means it trips within 10 seconds at 7.2x rated current, fast enough to protect standard induction motors during a locked-rotor event. Phase failure detection is built in, so a dropped phase on the line side will trip the breaker rather than letting the motor single-phase and overheat. ## DIN-rail fit and terminal style Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715 — the standard rail in any IEC panel. Mounting position is any orientation, which helps when fitting into tight gland-plate areas or vertical bus drops. The main circuit uses spring-loaded terminals accepting 2x 0.5 to 2.5 mm² solid or stranded; no screw torque to verify, no loosening under vibration. Dimensions are 45 mm wide, 97 mm deep, 119 mm high — this is a standard-width SIRIUS breaker that occupies one 45 mm slot on the rail, leaving the adjacent slots for contactors or overload relays.","metaTitle":"Siemens SIRIUS 3RV2021-4BA25-ZX95 Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4BA25-ZX95 motor protection circuit breaker, Class 10, 25 kA SCCR at 400 V, phase failure detection, spring-loaded terminals, active production. Quoted to or","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=773567&mlfb=3RV2021-4BA25-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4BA25-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2021-4BA25-ZX95 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote (RFQ) to confirm current pricing and availability at the time of order — no stock count or price figure is published here."},{"question":"What is 3RV2021-4BA25-ZX95's SCCR at 400 V?","answer":"The short-circuit current rating at 400 V is 25 kA. This is the interrupting rating that governs coordination in a motor branch circuit — the breaker can clear a fault up to that level without upstream protection needing to intervene."},{"question":"Does 3RV2021-4BA25-ZX95 detect phase failure?","answer":"Yes, phase failure detection is built in. If one line phase drops, the breaker will trip rather than allowing the motor to run single-phase, which prevents overheating and winding damage."},{"question":"What terminal type does 3RV2021-4BA25-ZX95 use?","answer":"Spring-loaded terminals on the main current circuit, accepting 2x 0.5 to 2.5 mm² solid or stranded wire. No screw clamping — the spring cage holds the conductor, which speeds panel wiring and resists loosening under vibration."},{"question":"Will 3RV2021-4BA25-ZX95 drop into a panel specified around 3RV1011-1HA10?","answer":"Not without rewiring. The 3RV1011-1HA10 is an S00 frame breaker with different dimensions, terminal style, and SCCR. The 3RV2021-4BA25-ZX95 is a physically larger S0/S2 frame unit (45 mm wide vs the S00's 45 mm but deeper and with different rail cutouts), and its spring-loaded terminals are not a direct match for the screw terminals on the 3RV1011. A panel designed for the S00 frame would need re-termination and possibly a new DIN-rail layout."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4BA25-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/3RV2021-4BA25-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}}