{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4AA15-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4AA15-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4AA15-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA15-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4AA15-ZX95 motor protection circuit breaker, Trip Class 10, 25 kA breaking capacity at 400 V, screw and snap-on DIN rail mounting.","salesMarkdown":"## What this SIRIUS motor protection breaker delivers The Siemens SIRIUS 3RV2021-4AA15-ZX95 is a motor protection circuit breaker designed for the 20 to 690 V range, with a Trip Class 10 characteristic that matches standard IEC motor starting profiles — it lets the motor draw locked-rotor current for up to 10 seconds before tripping, which covers most direct-on-line starts without nuisance trips. Rated breaking capacity hits 25 kA at 400 V, so it can interrupt a bolted fault at the motor terminals without relying on an upstream fuse for that level. For higher prospective fault currents, the spec calls for back-up fuses: gL/gG 63 A at 400 V, 50 A at 500 V, 40 A at 690 V. No ground fault detection on this variant, so plan for a separate ground-fault relay if the application requires it. The 45 mm width (three module spaces) and 97 mm depth mean it fits a standard distribution board or motor control center bucket without crowding adjacent devices. Clearance requirements: 50 mm upwards and downwards, 30 mm at the side, 0 mm forwards and backwards. That side clearance is tighter than some competitors — check that the adjacent breaker or contactor doesn't overhang into the 30 mm zone. Main contact terminals accept M4 screws, with wire capacity up to 2x 2.5 mm² stranded or solid. ## Operating conditions and ratings Rated operational voltage covers 20 to 690 V AC. Maximum switching rate under AC-3 duty is 15 operations per hour. Auxiliary contact ratings: 1 A at 24 V, 0.5 A at 120/125/230 V, 0.15 A at 60 V. These are the switching capacities for the integrated auxiliary contacts — useful for feeding a PLC input or a status lamp.","metaTitle":"Siemens 3RV2021-4AA15-ZX95 SIRIUS Motor Protection Circuit B","metaDescription":"Siemens SIRIUS 3RV2021-4AA15-ZX95 motor protection circuit breaker. Trip Class 10, 25 kA at 400 V, phase failure detection. DIN rail mount. Sourced to order against RFQ.","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":"97 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 40 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 standard mounting rail according to DIN EN 60715","at AC-3e maximum":"15 1/h","For Main Contacts":"M4","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"2 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"16 A","at 500 V rated value":"5 kA","at 600 V rated value":"16 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":"screw-type terminals","at 110/120 V rated value":"1 hp","at 200/208 V rated value":"3 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 5 to 6 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"Pozidriv size 2","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"9.25 W","at AC-3 at 400 V rated value":"16 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":"16 A","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"16 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","Design Of The Short-Circuit Trip":"magnetic","For Auxiliary And Control Circuit":"screw-type 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 AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Of The Auxiliary And Control Contacts":"M3","at AC in hot operating state per pole":"3.1 W","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), 2x (0.75 ... 2.5 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","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","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 (Switching Cycles) Typical":"100 000","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","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":"208 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":"10 ... 16 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=464838&mlfb=3RV2021-4AA15-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4AA15-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV2021-4AA15-ZX95 drop into a panel wired for 3RV2021-4CA25?","answer":"Both share the same 45 mm width and DIN rail footprint, so mechanical fit is identical. The terminal layout and auxiliary contact configuration are the same — no rewiring needed for the base connections."},{"question":"What compliance documentation does Siemens provide for this breaker?","answer":"As a SIRIUS product, it carries CE marking for the European market and UL/CSA certification for North America. RoHS and REACH declarations are available from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4AA15-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/3RV2021-4AA15-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}}