{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7126-4EB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7126-4EB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7126-4EB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7126-4EB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU7126-4EB0 thermal overload relay, S0 size, 32 A rated operational current, Trip Class 10, screw terminals, contactor-mount.","salesMarkdown":"The Siemens 3RU7126-4EB0 is a SIRIUS thermal overload relay in the S0 frame size, rated for 32 A operational current and Trip Class 10. It mounts directly onto a matching S0 contactor, protecting motor circuits against overcurrent by thermally sensing the load current and tripping the contactor's control circuit. Trip Class 10 means the relay will trip within 10 seconds at 7.2× the current setting — the standard for standard-duty motor starting where acceleration time is under a few seconds. Rated operational current of 32 A at 690 V AC/DC covers a wide range of three-phase motor loads up to roughly 15 kW at 400 V. The auxiliary contacts handle 3 A at 24 V and 2 A at 230 V, sufficient for signalling to a PLC or contactor coil. The relay is designed for contactor mounting — it clips directly onto the front of a SIRIUS S0 contactor, saving DIN-rail space and reducing wiring.","metaTitle":"Siemens 3RU7126-4EB0 SIRIUS Thermal Overload Relay, 32 A, Cl","metaDescription":"Siemens SIRIUS 3RU7126-4EB0 thermal overload relay, 32 A rated current, Trip Class 10, S0 size, IP20, contactor-mount. Active production, sourced to order.","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":"3.2 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":"9.6 W","Operating Voltage Rated Value":"690 V","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"32 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":"9.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"27 ... 32 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":"https://cdn.aoctrl.com/fd57eb33ee89a4ca1835f72e24e92b17.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1534249&mlfb=3RU7126-4EB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7126-4EB0/alternatives.json"},"ai":{"faq":[{"question":"What is the depth and width of 3RU7126-4EB0?","answer":"Depth is 96 mm, width is 45 mm."},{"question":"Will 3RU7126-4EB0 drop into a panel specified around 3RT1015-1BB42 without rewiring?","answer":"The 3RU7126-4EB0 is a thermal overload relay, while 3RT1015-1BB42 is a contactor. They are different components — the relay mounts onto a contactor, not in place of one. Check the panel design for the contactor frame size (S0) and wiring topology."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7126-4EB0","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/3RU7126-4EB0 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}}