{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2025-2QB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2025-2QB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2025-2QB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2025-2QB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2025-2QB0, CLASS 20E, contactor mounting, screw terminals, IP20 front, ATEX Ex II (2) GD.","salesMarkdown":"## What the CLASS 20E rating means for motor protection The Siemens 3RB2025-2QB0 is a SIRIUS solid-state overload relay with a CLASS 20E trip class, meaning it allows a motor to run at up to 720% of its full-load current for 20 seconds before tripping — the standard protection curve for standard induction motors driving pumps, fans, and conveyors where starting inrush is moderate and a faster trip (Class 10) would nuisance-trip on start. Rated for AC-3 duty up to 690 V, it covers 400 V and 480 V motor circuits common in North American and European panels, with pollution degree 3 rated voltage matching the same 690 V figure — so it's suited for industrial environments with conductive dust or humidity. ## Mounting and integration into a contactor assembly This relay mounts directly onto a contactor — no separate DIN-rail footprint needed — saving panel width. Main circuit connections use screw-type terminals accepting 0.5 to 4 mm² solid or 2x 0.5 to 2.5 mm² stranded, with AWG equivalents 14 to 10 for the main contacts. Auxiliary contact ratings are voltage-dependent: 2 A at 24 V, 4 A at 120 V, 3 A at 230 V — so verify the control voltage when sizing the aux circuit. ## Environmental and compliance profile The 3RB2025-2QB0 carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD, permitting installation in Zone 2 gas and Zone 22 dust atmospheres — a critical spare for food-and-bev or chemical lines where an explosive environment is a real possibility. Front protection is IP20 — finger-safe but not washdown-rated. EMC immunity includes 2 kV burst on power ports and 1 kV on signal ports (severity level 3 per IEC 61000-4-4), plus 6 kV surge voltage resistance. These figures mean it's unlikely to false-trip from nearby contactor switching or line transients in a typical panel.","metaTitle":"Siemens 3RB2025-2QB0 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens 3RB2025-2QB0 SIRIUS solid-state overload relay, CLASS 20E trip class, AC-3 rated 690 V, contactor mounting, ATEX certified. Sourced to order against RFQ.","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":"6 ... 25 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=231533&mlfb=3RB2025-2QB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2025-2QB0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2025-2QB0","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/3RB2025-2QB0 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}}