{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7126-1GB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7126-1GB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7126-1GB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1GB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU7126-1GB0, S0 thermal overload relay, 6.3 A rated current, Trip Class 10, 690 V, 50/60 Hz, IP20, contactor-mount.","salesMarkdown":"The Siemens 3RU7126-1GB0 is a SIRIUS S0 thermal overload relay rated for a main circuit operational current of 6.3 A at 690 V, 50/60 Hz, with Trip Class 10 protection. It mounts directly onto a contactor of the same S0 frame size, making it a matched thermal protection element for motor starters in control panels. The 6.3 A rated current sets the full-load motor current it protects — size the relay to the motor nameplate FLA, not the breaker. Trip Class 10 means it will trip within 10 seconds at 7.2× the current setting, which is the standard for standard-duty induction motors; a faster trip (Class 5) or slower (Class 20) would be needed for submersible or high-inertia loads respectively. Rated insulation voltage is 690 V AC with pollution degree 3, and surge voltage resistance is 6 kV — this covers 400 V and 480 V line-to-line systems with margin for transient spikes on industrial networks. Fastens directly onto an S0 contactor (e.g. 3RT1016 or 3RT1015) — no DIN rail required, though the contactor itself may be rail-mounted. Side spacing to grounded parts must be at least 6 mm. Main circuit terminals are screw-type, top and bottom, accepting 2× (0.5…1.5 mm²) solid/stranded or 2× (0.75…2.5 mm²) with ferrules. Auxiliary/control circuit terminals are also screw-type, torque 0.8…1.2 N·m. The front and terminal areas are IP20 rated — suitable for enclosed panels, not open washdown zones.","metaTitle":"Siemens 3RU7126-1GB0 SIRIUS Thermal Overload Relay, 6.3 A, C","metaDescription":"Siemens 3RU7126-1GB0 SIRIUS S0 thermal overload relay, 6.3 A rated current, Trip Class 10, 690 V, 50/60 Hz, 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":"2.2 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":"6.6 W","Operating Voltage Rated Value":"690 V","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"6.3 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":"6.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"4.5 ... 6.3 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/48342feb54dd00b4eebf246e6f98023a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1534241&mlfb=3RU7126-1GB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7126-1GB0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RU7126-1GB0?","answer":"The 3RU2116-1FC1 is a similar SIRIUS S0 thermal overload relay but check its current setting range — the 3RU7126-1GB0 is rated 6.3 A, while the 3RU2116-1FC1 covers a different band. They share the same S0 contactor-mount footprint, so a panel wired for one can accept the other without rewiring, provided the current range matches the motor."},{"question":"Where can I buy the 3RU7126-1GB0?","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/3RU7126-1GB0","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/3RU7126-1GB0 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}}