{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7126-1CB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7126-1CB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7126-1CB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1CB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU7126-1CB0, S0 size, 2.5 A rated operational current, Class 10 trip, screw terminals.","salesMarkdown":"The Siemens 3RU7126-1CB0 is a SIRIUS thermal overload relay in the S0 frame size, rated for a 2.5 A operational current and a Class 10 trip characteristic. It mounts directly to a S0 contactor (e.g., the 3RT10 series) via the contactor-mounting fastening method, forming a compact motor starter package for a DIN-rail panel. The relay accepts a wide mounting position range: vertical surface with ±135° rotation and ±45° tilt forward/backward, giving panel builders flexibility in tight enclosures. Side spacing to grounded parts must be at least 6 mm. Terminals are screw-type on both the main and auxiliary circuits. Main circuit terminals accept 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid/stranded, torqued to 2…2.5 N·m. Auxiliary terminals take the same wire sizes at 0.8…1.2 N·m. ## Ratings & Environment Rated operational current is 2.5 A AC/DC for the main circuit at up to 690 V, 50/60 Hz. Auxiliary contacts are rated 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. Installation altitude is limited to 2000 m above sea level. The relay withstands 6 kV surge voltage and 8g/11 ms shock per IEC 60068-2-27.","metaTitle":"Siemens 3RU7126-1CB0 SIRIUS Thermal Overload Relay, 2.5 A, C","metaDescription":"Siemens 3RU7126-1CB0 SIRIUS thermal overload relay, 2.5 A rated current, Class 10 trip, S0 size. Current production. Sourced to order against 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":"2.5 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":"5.7 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"1.8 ... 2.5 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":"https://cdn.aoctrl.com/bdbc392c497fa0d2435a95f1c4583cf8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1534237&mlfb=3RU7126-1CB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1CB0/alternatives.json"},"ai":{"faq":[{"question":"What is the rated current and trip class of 3RU7126-1CB0?","answer":"The rated operational current is 2.5 A with a Class 10 trip characteristic, meaning it trips within 10 seconds at 7.2× the current setting."},{"question":"What contactor does 3RU7126-1CB0 mount to?","answer":"It mounts to a S0-size contactor via the contactor-mounting fastening method, such as the Siemens 3RT10 series. The relay and contactor share the S0 frame size."},{"question":"Where can I buy 3RU7126-1CB0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7126-1CB0","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/3RU7126-1CB0 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}}