{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2025-2RB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2025-2RB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2025-2RB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2025-2RB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2025-2RB0, CLASS 20E trip class, 45 mm width, screw terminals, ATEX Ex II (2) GD.","salesMarkdown":"The Siemens SIRIUS 3RB2025-2RB0 is a solid-state overload relay with a CLASS 20E trip characteristic, designed for contactor mounting in motor feeder circuits. It carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD, meaning it is approved for use in potentially explosive atmospheres as an associated apparatus — the relay itself can be mounted outside the hazardous area while protecting motors inside Zone 1 or 2 (gas) and Zone 21 or 22 (dust). This makes it a compliance-ready choice for chemical, pharmaceutical, or grain-handling lines where the protection device must not become an ignition source. The CLASS 20E trip class means the relay allows a locked-rotor current duration of up to 20 seconds at ambient temperature before tripping — sized for standard induction motors with moderate starting inertia (conveyors, fans, pumps). This is not a fast-trip class; if your application has a high-inertia load requiring longer acceleration, you would need a CLASS 30 or field-adjustable relay. Mounting is contactor-mount, meaning it clips directly onto the output side of a matching SIRIUS contactor, saving DIN-rail space. Side clearance to adjacent devices is 6 mm, which is standard for this class — no special spacing required. The screw-type terminals for the main current circuit accept solid conductors from 0.5 to 4 mm², or two conductors 2x (0.5 to 2.5 mm²). AWG equivalents are 2x (14 to 10). Surge voltage resistance is rated at 6 kV, and EMC burst immunity meets IEC 61000-4-4 severity level 3: 2 kV on power ports, 1 kV on signal ports. These ratings confirm it is suitable for industrial control panels in standard factory environments without additional suppression. ## Compliance documentation The relay carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD, which is a European explosive-atmosphere directive. It is also designed to meet IEC 61000-4-4 EMC immunity at severity level 3. For RoHS, REACH, and UL documentation, the manufacturer provides a declaration of conformity and the ATEX certificate as part of the standard documentation pack — these are available at the time of order.","metaTitle":"Siemens 3RB2025-2RB0 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens SIRIUS 3RB2025-2RB0 solid-state overload relay, CLASS 20E trip class, 45 mm wide, ATEX certified. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"75 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"45 mm","Height":"73 mm","Maximum":"2 000 m","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","at 110 V":"0.3 A","at 120 V":"4 A","at 125 V":"0.3 A","at 220 V":"0.11 A","at 230 V":"3 A","Backwards":"0 mm","Downwards":"0 mm","Trip class":"CLASS 20E","At The Side":"6 mm","On The Front":"IP20","Mounting type":"Contactor mounting","During Storage":"-40 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Shock resistance":"15g / 11 ms","Mounting position":"any","Product brand name":"SIRIUS","Type of protection":"PTB 06 ATEX 3001 Ex II (2) GD","Product designation":"solid-state overload relay","For Auxiliary Contacts":"0","For Main Current Circuit":"screw-type terminals","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"0.05 W","Relative humidity during operation":"100 %","due to burst acc. to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","at AWG conductors for main contacts":"2x (14 ... 10)","Surge voltage resistance rated value":"6 kV","Reference code acc. to DIN EN 81346-2":"F","at AC in hot operating state per pole":"0.02 W","With Degree Of Pollution 3 Rated Value":"690 V","Finely Stranded With Core End Processing":"0.5 ... 2.5 mm², 2x (0.5 ... 1.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (20 ... 14)","For Auxiliary And Control Current Circuit":"screw-type terminals","Number of NC contacts for auxiliary contacts":"1","Number of NO contacts for auxiliary contacts":"1","Electrostatic discharge acc. to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Size of contactor can be combined company-specific":"S0","due to conductor-earth surge acc. to IEC 61000-4-5":"2 kV (line to earth) corresponds to degree of severity 3","Removable Terminal For Auxiliary And Control Circuit":"Yes","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A","Adjustable pick-up value current of the current-dependent overload release":"0.1 ... 0.4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=451153&mlfb=3RB2025-2RB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2025-2RB0/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class and what does it mean for motor protection?","answer":"The trip class is CLASS 20E. This means the relay will allow a motor to draw locked-rotor current for up to 20 seconds at 20 °C before tripping. It is suitable for standard induction motors driving centrifugal pumps, fans, or conveyors with moderate starting inertia. For high-inertia loads (crushers, centrifuges), a CLASS 30 relay would be more appropriate."},{"question":"What compliance documentation is available for this part?","answer":"The relay carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD, confirming suitability as associated apparatus for explosive atmospheres. It also meets IEC 61000-4-4 EMC immunity at severity level 3. The manufacturer provides a declaration of conformity and the ATEX certificate upon request at order placement."},{"question":"What are the terminal wire size specifications?","answer":"The screw-type terminals accept solid conductors from 0.5 to 4 mm², or two conductors 2x (0.5 to 2.5 mm²). For AWG, this is 2x (14 to 10). These are standard sizes for motor circuit wiring up to the relay's rated voltage of 690 V AC-3."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2025-2RB0","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/3RB2025-2RB0 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}}