{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2021-0JA25","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2021-0JA25","canonicalUrl":"https://aoctrl.com/siemens/3RV2021-0JA25","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2021-0JA25","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, motor-protective circuit breaker, 3RV2021-0JA25, CLASS 10 trip, 100 kA breaking capacity at 400 V AC, 45 mm wide, screw and snap-on DIN-rail mount.","salesMarkdown":"The Siemens 3RV2021-0JA25 is a SIRIUS motor-protective circuit breaker designed for motor protection with CLASS 10 trip characteristics, meaning it will trip within 10 seconds at 7.2× the thermal setting — fast enough to protect a standard induction motor during a locked-rotor start but slow enough to ride through normal acceleration. Rated breaking capacity hits 100 kA at 400 V AC (and at 240 V, 500 V, and 690 V), so this breaker can safely interrupt fault currents up to that level without upstream fusing in most industrial panels — a key spec for high-fault-capacity installations. At 45 mm wide, it occupies a single 45 mm slot on the rail — standard for this class of motor-protective device. The depth is the critical fit dimension for enclosure depth — 97 mm clears most standard shallow enclosures (100 mm minimum internal depth), but verify your gland plate and busbar clearance. Terminals are spring-loaded for the main current circuit, accepting 2× (0.5 to 2.5 mm²) solid or stranded. No screw torque to verify on the spring-cage side; strip length and ferrule size are the only variables. Auxiliary contact space is available on the side. Clearance distances: 50 mm upwards and downwards, 30 mm at the side, 0 mm forwards and backwards. The zero forward/backward clearance means it can be mounted flush against a backplate or panel door — no extra breathing space needed in those axes. Storage and transport range: -50 to +80 °C. ## Ratings and selection notes Ground fault detection is not included; if that's required, add an external ground-fault module or specify a different variant. Rated operational voltage range: 20 to 690 V AC. Power ratings: 0.2 kW at 230 V, 0.5 hp at 575/600 V. 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 dry-contact switching limits for the integrated auxiliary contacts. Maximum switching frequency at AC-3 duty: 15 operations per hour. That's the thermal limit for motor starting — fine for pump or fan cycling, but not for high-repetition applications like stamping presses or rapid indexing.","metaTitle":"Siemens 3RV2021-0JA25 SIRIUS Motor Circuit Breaker, 100 kA","metaDescription":"Siemens 3RV2021-0JA25 SIRIUS motor-protective circuit breaker, CLASS 10 trip, 100 kA breaking capacity at 400 V, 45 mm wide. Current production. Sourced to order.","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","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","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":"0.2 kW","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"1 A","at 500 V rated value":"100 kA","at 600 V rated value":"1 A","at 690 V rated value":"100 kA","Design Of The Product":"For motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"spring-loaded terminals","Temperature Compensation":"-20 ... +60 °C","at 575/600 V rated value":"0.5 hp","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"100 kA","at AC at 500 V rated value":"100 kA","at AC at 690 V rated value":"100 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":"7.25 W","at AC-3 at 400 V rated value":"1 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":"1 A","at AWG cables for main contacts":"2x (18 ... 8)","Design Of The Short-Circuit Trip":"magnetic","For Auxiliary And Control Circuit":"spring-loaded terminals","Between Main And Auxiliary Circuit":"400 V","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 ... 14)","at AC in hot operating state per pole":"2.4 W","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 (Switching 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":"13 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.7 ... 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$38.10","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=373849&mlfb=3RV2021-0JA25","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2021-0JA25/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 3RV2021-0JA25?","answer":"100 kA at 240 V, 400 V, 500 V, and 690 V AC — this covers most industrial fault-current scenarios without upstream fusing."},{"question":"What are the mounting dimensions for the 3RV2021-0JA25?","answer":"45 mm wide, 97 mm deep, 119 mm tall. It snaps onto a 35 mm DIN rail per DIN EN 60715, with zero forward/backward clearance required."},{"question":"Where can I buy the 3RV2021-0JA25 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a binding commercial offer."},{"question":"Will the 3RV2021-0JA25 drop into a panel designed for the 3RV1011-0GA10?","answer":"Both are 45 mm wide SIRIUS motor-protective breakers on the same DIN-rail footprint, so mechanical fit is identical. Verify the trip class and setting range match your motor protection curve — the 3RV2021-0JA25 is CLASS 10, while the 3RV1011-0GA10 may differ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2021-0JA25","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/3RV2021-0JA25 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}}