{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7126-4DB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7126-4DB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7126-4DB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7126-4DB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 thermal overload relay, 3RU7126-4DB0, CLASS 10, 25 A rated operational current, 690 V, 50/60 Hz, screw terminals, IP20.","salesMarkdown":"## SIRIUS S0 thermal overload relay, 25 A, CLASS 10 The Siemens 3RU7126-4DB0 is a SIRIUS S0-size thermal overload relay rated 25 A operational current, CLASS 10 trip class, for 3-phase AC/DC main circuits up to 690 V, 50/60 Hz. It mounts directly to the corresponding S0 contactor, saving DIN-rail space and reducing wiring — the fastening method is contactor mounting, with the relay sitting on top of the contactor and the main power connections passing through. Dimensions are 45 mm wide × 97 mm high × 96 mm deep — the S0 footprint fits standard 45 mm contactor width, so it lines up with the contactor's power terminals. Side spacing to grounded parts is 6 mm minimum; the IP20 finger-safe terminals on the front and at the connection points are rated for protected environments only — no washdown, no outdoor exposure without an enclosure.","metaTitle":"Siemens 3RU7126-4DB0 SIRIUS S0 Thermal Overload Relay, CLASS","metaDescription":"Siemens 3RU7126-4DB0 SIRIUS S0 thermal overload relay, CLASS 10, 25 A rated current. IP20, contactor mounting. Current lifecycle stage. Available 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":"2.7 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":"8.1 W","Operating Voltage Rated Value":"690 V","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"25 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":"8.1 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"20 ... 25 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/cc4b14a4fdb295824a8b00000a9a29ae.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1534248&mlfb=3RU7126-4DB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7126-4DB0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RU7126-4DB0?","answer":"Sourced to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time."},{"question":"Will 3RU7126-4DB0 drop into a panel specified around 3RU2116-1FC1 without rewiring?","answer":"Both are S0-size overload relays from the same SIRIUS family, so the footprint and contactor interface are identical — same 45 mm width, same contactor-mounting pattern. The 3RU7126-4DB0 is the newer generation (SIRIUS Innovation) with a higher rated operational current of 25 A versus the 3RU2116-1FC1's lower rating, so it will physically fit but the current setting range must match the motor FLA."},{"question":"What compliance documentation does Siemens provide for 3RU7126-4DB0?","answer":"Siemens SIRIUS overload relays typically carry UL, CSA, CE, and CCC approvals; the specific certifications for this order code are confirmed at the time of order. RoHS and REACH declarations are available from the manufacturer upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7126-4DB0","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/3RU7126-4DB0 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}}