{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-4DA15","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-4DA15","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-4DA15","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4DA15","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2021-4DA15 motor-protective circuit breaker, CLASS 10 trip class, 25 kA breaking capacity at 400 V, phase failure detection, 45 mm width, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"The Siemens SIRIUS 3RV2021-4DA15 is a motor-protective circuit breaker designed for Class 10 trip response. It's the part that sits between your contactor and the motor, sized to protect a 3 hp load at 230 V. Any mounting position works, which simplifies panel layout when you're packing breakers into a tight gland plate. That's a critical feature for a motor-protective breaker on a three-phase line: if one phase drops, the breaker trips before the motor single-phases and cooks the winding. No ground fault detection on this variant, so if that's required you'd look at a different order code in the 3RV2 family. The interrupting rating varies with system voltage: 100 kA at 240 V, 25 kA at 400 V, 5 kA at 500 V, and 2 kA at 690 V. On a 480 V system the continuous current rating is 25 A. That 25 kA at 400 V is the figure most panel builders will check first — it tells you whether this breaker coordinates with the downstream contactor and upstream feeder in a 400 V distribution. ## Duty cycle and temperature range Rated for 15 switching operations per hour at AC-3 (motor) duty. That wide storage range matters if the spare sits in an unheated warehouse through a winter shutdown — the breaker won't degrade from cold soak. The operating range covers most mill environments, but if your panel is in a steam trench or directly above a dryer section, check that the internal temperature stays under 60 °C. Main contact terminals accept M4 screws. Wire range 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded. That covers standard motor leads up to 2.5 mm² — if your motor is pulling more than 25 A continuous, the wire gauge would be larger and you'd step up to the next frame size. Auxiliary contact ratings: 1 A at 24 V, 0.5 A at 120/125/230 V, 0.15 A at 60 V. Lifecycle status is current — this is an active catalog item in the SIRIUS line. No last-time-buy or phase-out notice is in effect for this order code.","metaTitle":"Siemens 3RV2021-4DA15 SIRIUS Motor Circuit Breaker, CLASS 10","metaDescription":"Siemens SIRIUS 3RV2021-4DA15 motor-protective circuit breaker. CLASS 10 trip, 25 kA breaking capacity at 400 V. Phase failure detection. DIN rail mount. Sourced to order against RF","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 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","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":"3 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"25 A","at 500 V rated value":"5 kA","at 600 V rated value":"25 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":"2 hp","at 200/208 V rated value":"5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 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":"10.5 W","at AC-3 at 400 V rated value":"25 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":"25 A","Design Of The Auxiliary Switch":"transverse","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"25 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":"3.5 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 (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":"325 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":"18 ... 25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$55.88","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=65860&mlfb=3RV2021-4DA15","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-4DA15/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2021-4DA15 and how do I get a price?","answer":"3RV2021-4DA15 is sourced to order against an RFQ through our independent distribution channel. Submit a quote request; availability and current pricing are confirmed at quote time. No stock count or price figure is published here."},{"question":"Will 3RV2021-4DA15 drop into a panel specified around 3RV2021-4CA25 without rewiring?","answer":"Yes. Both parts share the same 45 mm width, same screw and snap-on mounting onto 35 mm DIN rail, and same M4 terminal sizing. The physical footprint is identical — it fits the same DIN slot and the same wire range. The only difference is the overload setting range; verify the motor FLA against the 4DA15's rating before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-4DA15","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/3RV2021-4DA15 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}}