{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2025-1QB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2025-1QB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2025-1QB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2025-1QB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2025-1QB0, 3-pole, CLASS 10E, screw terminals, IP20 front, 45x73x75 mm.","salesMarkdown":"The Siemens 3RB2025-1QB0 is a SIRIUS solid-state overload relay, designed to protect three-phase AC motors against overcurrent and phase imbalance. Three poles handle the main current circuit, with screw-type terminals accepting solid conductors from 0.5 to 4 mm² (or 2× 0.5 to 2.5 mm²), and finely stranded with ferrules down to 0.5 mm². That covers most control-circuit and small-motor power wiring up to about 4 kW at 400 V. Maximum AC-3 rated voltage is 690 V, so it's compatible with 400 V and 690 V three-phase networks common in European industrial installations. Surge voltage resistance is rated at 6 kV, and burst immunity meets IEC 61000-4-4 severity level 3 (2 kV on power ports, 1 kV on signal ports). This means it will tolerate typical switching transients from contactors and drives in the same cabinet without false tripping. Shock resistance of 15g for 11 ms covers most vibration profiles in fixed industrial machinery. ## Compliance and Sourcing Reality For a BOM freeze or validation project, this part is fully traceable under Siemens change control. Dimensions are 45 mm wide, 73 mm high, 75 mm deep. This fits a standard 45 mm-wide contactor footprint with zero-gap stacking vertically.","metaTitle":"Siemens 3RB2025-1QB0 SIRIUS Solid-State Overload Relay, CLAS","metaDescription":"Siemens SIRIUS 3RB2025-1QB0 solid-state overload relay, 3-pole, CLASS 10E trip, screw terminals, 0.5-4 mm², IP20 front, ATEX Ex II (2) GD. Current production.","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","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 10E","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","at AC in hot operating state per pole":"0.02 W","reference code acc. to DIN EN 81346-2":"F","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","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","with degree of pollution 3 at AC rated value":"690 V","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","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","type of connectable conductor cross-sections at AWG conductors for auxiliary contacts":"2x (20 ... 14)"}},"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=317986&mlfb=3RB2025-1QB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2025-1QB0/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this relay carry?","answer":"It carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD for use in potentially explosive atmospheres (gas and dust). It also meets IEC 61000-4-4 burst immunity severity 3 and surge voltage resistance of 6 kV."},{"question":"What wire sizes fit the main circuit terminals?","answer":"Screw terminals accept solid conductors 0.5 to 4 mm² (or 2× 0.5 to 2.5 mm²), and finely stranded with ferrules 0.5 to 2.5 mm² (or 2× 0.5 to 1.5 mm²). AWG equivalents are 2× 14 to 10 for main contacts."},{"question":"What is the depth of this overload relay?","answer":"The depth is 75 mm, with zero clearance required forwards, backwards, upwards, or downwards, and 6 mm at the side."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2025-1QB0","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/3RB2025-1QB0 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}}