{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4FA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4FA15","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4FA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4FA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2021-4FA15, Class 10 trip, 10 kA SCCR at 400 V, phase failure detection, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"Depth of 97 mm means it projects about the same as a typical contactor, so the gland plate clearance is the same for the whole starter row. ## Protection features and ratings The auxiliary contact ratings are worth noting for the control circuit: 1 A at 24 V, 0.5 A at 120/125/230 V, and only 0.15 A at 60 V. That last figure catches people out if they're switching a 60 VDC PLC input — the contact is rated for it, but the current limit is tight.","metaTitle":"Siemens 3RV2021-4FA15 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2021-4FA15 SIRIUS motor protection circuit breaker, Class 10, 10 kA at 400 V, phase failure detection. Current 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":{"Depth":"97 mm","Width":"45 mm","Height":"97 mm","Upwards":"70 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":"gG 63 A","at 500 V":"gG 63 A","at 690 V":"gG 63 A","Backwards":"0 mm","Downwards":"70 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 ... +40 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","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":"7.5 hp","at 240 V rated value":"100 kA","at 400 V rated value":"10 kA","at 480 V rated value":"40 A","at 500 V rated value":"3 kA","at 600 V rated value":"40 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":"3 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"30 hp","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"20 kA","at AC at 500 V rated value":"6 kA","at AC at 690 V rated value":"3 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":"16.25 W","at AC-3 at 400 V rated value":"40 A","Of Auxiliary Contacts Typical":"100 000","Substance Prohibitance (Date)":"10/01/2009","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"40 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":"5.4 W","With Side-By-Side Mounting At The Side":"9 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 (Operating 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":"480 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":"34 ... 40 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=163601&mlfb=3RV2021-4FA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4FA15/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 3RV2021-4FA15 at 400 V?","answer":"The breaking capacity is 10 kA at 400 V, which is the rating that governs panel SCCR coordination for standard industrial motor circuits."},{"question":"Does the 3RV2021-4FA15 detect phase failure?","answer":"Yes, phase failure detection is built in. If one phase drops, the breaker trips on the resulting single-phase current to protect the motor."},{"question":"Where can I buy the 3RV2021-4FA15 and how is it quoted?","answer":"The 3RV2021-4FA15 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4FA15","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/3RV2021-4FA15 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}}