{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2025-1NB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2025-1NB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2025-1NB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2025-1NB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2025-1NB0, Class 10E, 690 V AC-3, screw terminals, contactor mount, IP20 front.","salesMarkdown":"The Siemens 3RB2025-1NB0 is a SIRIUS solid-state overload relay — a Class 10E device that protects motor circuits from sustained overcurrent by tripping within 10 seconds at 7.2× the set current. It mounts directly onto a contactor, saving DIN-rail space in the panel. Trip class 10E is the critical spec: it means the relay will open the circuit within 10 seconds at a 7.2× overload. If your motor application requires a slower trip curve (Class 20 or 30) for high-inertia loads like centrifuges, this part won't hold. Wire range on the main circuit terminals accepts 0.5 to 4 mm² solid, or two conductors of 0.5 to 2.5 mm² each — covers most motor leads up to about 4 kW at 400 V. Use ferruled stranded for reliable termination. That's fine for most indoor panel environments; derate if mounted near a heat source like a drive heatsink. Shock rated at 15 g for 11 ms — tough enough for machine-mounted panels on presses or punch lines. This relay is designed for contactor mounting — it snaps onto the front of a matching SIRIUS contactor, not onto a DIN rail. That keeps the power wiring short and the assembly compact. Side clearance of 6 mm to adjacent devices is sufficient for ventilation. Carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD, meaning it can be used in the non-hazardous part of a circuit that controls equipment in a Zone 1 or Zone 21 area — common in chemical and grain-handling plants. Surge voltage resistance is rated at 6 kV, and it withstands burst transients at severity level 3 per IEC 61000-4-4 — 2 kV on power ports, 1 kV on signal ports. That's the standard for industrial control panels in heavy industrial environments.","metaTitle":"Siemens 3RB2025-1NB0 SIRIUS Solid-State Overload Relay, Clas","metaDescription":"Siemens SIRIUS 3RB2025-1NB0 solid-state overload relay, Class 10E trip, 690 V max, ATEX certified, contactor mount. Current 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 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","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":"0.32 ... 1.25 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=393576&mlfb=3RB2025-1NB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2025-1NB0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this overload relay?","answer":"Trip class 10E, maximum AC-3 voltage 690 V, operating temperature -25 to +60 °C, IP20 front protection, ATEX certified Ex II (2) GD, and surge voltage resistance 6 kV."},{"question":"What compliance documentation does Siemens provide for this part?","answer":"The part carries ATEX certification (PTB 06 ATEX 3001 Ex II (2) GD) and is designed to meet IEC 61000-4-4 surge/burst standards. Standard Siemens documentation includes the declaration of conformity for CE marking; RoHS and REACH compliance data is available through Siemens Industry Online Support."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2025-1NB0","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/3RB2025-1NB0 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}}