{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7126-1EB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7126-1EB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7126-1EB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1EB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU7126-1EB0, S0 size, 4 A rated operational current, Class 10 trip, 690 V, IP20, screw terminals.","salesMarkdown":"It mounts directly onto a S0 contactor, forming a compact motor starter assembly for panel builds. The relay uses a bimetallic thermal element to track motor heating — no electronics to fail in dirty environments. Rated operational current is 4 A, with a trip class of CLASS 10 — meaning it will trip within 10 seconds at 7.2× the current setting, matching the startup profile of standard induction motors. Rated operating voltage is 690 V AC/DC, and the relay handles 50/60 Hz supply. The thermal memory means it won't reset instantly after a trip, which protects motors from rapid re-acceleration. This is a contactor-mount relay — it snaps onto the bottom of a S0-frame contactor, no DIN rail needed. The mounting position allows ±135° rotation and ±45° tilt from vertical, so it adapts to tight enclosures. Width is 45 mm, depth 96 mm, height 97 mm — plan for 6 mm side clearance to grounded parts. Screw terminals for both main and auxiliary circuits; torque main contacts to 2–2.5 N·m, aux contacts to 0.8–1.2 N·m. Installation altitude limited to 2000 m above sea level.","metaTitle":"Siemens 3RU7126-1EB0 SIRIUS Thermal Overload Relay, 4 A, Cla","metaDescription":"Siemens 3RU7126-1EB0 SIRIUS thermal overload relay, 4 A rated current, Class 10 trip, 690 V, IP20. Active production. S0 size, contactor-mount. RFQ for lead time.","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":"1.9 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":"5.7 W","Operating Voltage Rated Value":"690 V","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"4 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":"5.7 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"2.8 ... 4 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=1534239&mlfb=3RU7126-1EB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1EB0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this overload relay?","answer":"Rated operational current is 4 A, trip class CLASS 10, rated operating voltage 690 V AC/DC, operating frequency 50/60 Hz. It has three poles for the main circuit and screw-type terminals."},{"question":"Will 3RU7126-1EB0 fit a panel designed for 3RT1015-1BB42?","answer":"The 3RU7126-1EB0 is an overload relay, while 3RT1015-1BB42 is a contactor. They are designed to mate together — the 3RU7126 mounts directly onto a S0-frame contactor like the 3RT1015 series. No rewiring of the main circuit is needed if the contactor is already S0 size; the relay's screw terminals match the contactor's output side."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7126-1EB0","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/3RU7126-1EB0 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}}