{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7126-1FB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7126-1FB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7126-1FB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1FB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, size S0, CLASS 10, 3-pole, rated operational current 5 A, 690 V, screw terminals.","salesMarkdown":"The Siemens 3RU7126-1FB0 is a SIRIUS thermal overload relay, size S0, designed for 3-pole motor protection. It mounts directly to a matching contactor — the fastening method is contactor mounting, and it's sized to combine with S0 contactors in the same family. ## Key ratings for the BOM line Rated operational current is 5 A, with a rated operating voltage of 690 V AC/DC at 50/60 Hz. The auxiliary contacts are rated at 24 V 3 A and 230 V 2 A. Mounts on a vertical surface with ±135° rotation and ±45° tilt forward/back. The enclosure is IP20 at the front and terminals. Operating temperature range is -20 to +55 °C, storage -25 to +70 °C, with humidity up to 90%. Installation altitude is limited to 2000 m. Shock resistance per IEC 60068-2-27 is 8g for 11 ms.","metaTitle":"Siemens 3RU7126-1FB0 SIRIUS Thermal Overload Relay, CLASS 10","metaDescription":"Siemens SIRIUS 3RU7126-1FB0 thermal overload relay, size S0, CLASS 10, rated 5 A, 690 V. Current production. Order to RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"96 mm","Width":"45 mm","Height":"97 mm","at 24 V":"3 A","Per Pole":"2.2 W","at 230 V":"2 A","Trip Class":"CLASS 10","On The Front":"IP20","Of The Terminal":"IP20","lifecycle_stage":"current","During Operation":"-20 ... +55 °C","During Transport":"-25 ... +70 °C","Fastening Method":"Contactor mounting","Mounting Position":"with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Thermal overload relay","Size Of Overload Relay":"S0","For Main Current Circuit":"screw-type terminals","power loss [W] total typical":"6.6 W","Operating Voltage Rated Value":"690 V","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"5 A","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"0 ... 90 %","Surge Voltage Resistance Rated Value":"6 kV","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Type Of Voltage For Main Current Circuit":"AC/DC","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","shock resistance according to IEC 60068-2-27":"8g / 11 ms","Required Spacing For Grounded Parts At The Side":"6 mm","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","Size Of Contactor Can Be Combined Company-Specific":"S0","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","operational current of auxiliary contacts at DC-13 at 24 V":"1 A","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","insulation voltage with degree of pollution 3 at AC rated value":"690 V","power loss [W] for rated value of the current at AC in hot operating state":"6.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"3.5 ... 5 A","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A, quick: 10 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=1534240&mlfb=3RU7126-1FB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1FB0/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of the 3RU7126-1FB0?","answer":"Width is 45 mm, height 97 mm, depth 96 mm. These are the envelope dimensions for panel layout."},{"question":"What is the trip class of this overload relay?","answer":"It is CLASS 10, meaning the relay trips within 10 seconds at 7.2× the current setting — suited for standard motor starting duty."},{"question":"What contactor size does this relay mate with?","answer":"It is size S0 and is designed for contactor mounting with S0 contactors in the SIRIUS family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7126-1FB0","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/3RU7126-1FB0 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}}