{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7126-1DB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7126-1DB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7126-1DB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1DB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU7126-1DB0 thermal overload relay, S0 size, 3-pole, 3.2 A rated current, Trip Class 10, 690 V, screw terminals, IP20.","salesMarkdown":"The Siemens 3RU7126-1DB0 is a SIRIUS S0-size thermal overload relay, designed to protect three-phase AC motors against overload and phase failure by monitoring the motor current and tripping the associated contactor when the current exceeds the setpoint for too long. The relay is rated for a continuous operational current of 3.2 A at up to 690 V AC/DC, 50/60 Hz, and it mounts directly onto a matching S0 contactor (e.g., the 3RT10 series), saving panel space and wiring. This relay is sized for the S0 contactor frame — it fastens directly onto the contactor via the contactor mounting method, eliminating separate DIN-rail space and reducing wiring between the contactor and overload. The main circuit uses screw-type terminals on top and bottom, accepting 2× (0.5 to 1.5 mm²) solid/stranded or 2× (0.75 to 2.5 mm²) finely stranded with ferrules, with a tightening torque of 2 to 2.5 N·m. Auxiliary and control circuit terminals are also screw-type, torqued to 0.8 to 1.2 N·m. The auxiliary contacts are rated at 3 A at 24 V and 2 A at 230 V, with a DC-13 rating of 1 A at 24 V for the control circuit. The enclosure is rated IP20 on the front and at the terminals, suitable for installation inside a control cabinet that provides the environmental seal.","metaTitle":"Siemens 3RU7126-1DB0 SIRIUS Thermal Overload Relay, 3.2 A, C","metaDescription":"Siemens SIRIUS 3RU7126-1DB0 thermal overload relay, 3.2 A rated current, Trip Class 10, S0 size, 3-pole, 690 V, IP20, current production. Sourced to order via 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":"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":"3.2 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":"2.2 ... 3.2 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=1534238&mlfb=3RU7126-1DB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1DB0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source or alternative?","answer":"The 3RU7126-1DB0 is designed to mount directly on S0-frame contactors such as the 3RT1015 or 3RT1017 series. Those contactors are the intended companion, not a second-source substitute for the overload relay itself. For a direct replacement, order the same 3RU7126-1DB0."},{"question":"What are the key dimensions?","answer":"Width is 45 mm, height is 97 mm, and depth is 96 mm. It requires 6 mm of spacing to grounded parts on the side."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7126-1DB0","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/3RU7126-1DB0 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}}