{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU6126-1EB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU6126-1EB0","canonicalUrl":"https://aoctrl.com/siemens/3RU6126-1EB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU6126-1EB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU6126-1EB0 thermal overload relay, adjustable current 2.8-4 A, Class 10 trip, 690 V, 3-pole, size S0, screw terminals, contactor mounting.","salesMarkdown":"## Motor protection relay for S0 contactors The 3RU6126-1EB0: Total typical power dissipation is 5.4 W, with 1.9 W per pole at the rated current — a figure to budget for when packing relays side-by-side in a panel, especially given the 6 mm required spacing to grounded parts. ## Class 10 trip and the 2.8–4 A window The adjustable current response value of 2.8…4 A covers the lower end of the S0 frame's range — common for fractional-horsepower motors, small conveyors, or pump drives drawing around 3–4 A full-load. The Class 10 trip class matches IEC 60947-4-1 and ensures the relay opens before the motor winding insulation degrades during a stall. Surge voltage resistance is 6 kV and insulation voltage at pollution degree 3 is 690 V, so the relay can sit in a 480 V panel with adequate clearance to grounded metalwork. Shock resistance per IEC 60068-2-27 is 8 g for 11 ms — sufficient for most industrial machinery but worth noting if the relay is mounted on a contactor that sees frequent high-impact switching. ## Mounting and environmental envelope Fastening is by direct contactor mounting — the relay snaps onto the S0 contactor without additional DIN-rail hardware, keeping the assembly compact at 45 mm wide × 85 mm deep × 85 mm high. Installation altitude is limited to 2,000 m above sea level without derating — above that, the dielectric strength of air gaps decreases and the relay's insulation coordination may need review. RoHS compliance date is May 1, 2012, covering the EU directive's substance restrictions. The relay carries no UL or CSA mark in the on-record data, so verify local code acceptance if the panel requires third-party certification for the overload relay itself.","metaTitle":"Siemens 3RU6126-1EB0 SIRIUS Overload Relay, 2.8-4 A","metaDescription":"Siemens SIRIUS 3RU6126-1EB0 thermal overload relay, 2.8-4 A adjustable, Class 10 trip, 690 V, size S0 for contactor mounting. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"85 mm","Width":"45 mm","title":"3RU6126-1EB0","Height":"85 mm","at 24 V":"2 A","Per Pole":"1.9 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 2.8...4.0 A size S0, class 10, for motor protection for mounting onto contactors main circuit: screw terminal AUX. circuit: screw terminal manual automatic reset","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Contactor mounting","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Thermal overload relay","For Main Current Circuit":"screw-type terminals","power loss [W] total typical":"5.4 W","Operating Voltage Rated Value":"690 V","Substance Prohibitance (Date)":"05/01/2012","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"4 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"0 ... 90 %","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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","shock resistance according to IEC 60068-2-27":"8g / 11 ms","Required Spacing For Grounded Parts At The Side":"6 mm","Size Of Contactor Can Be Combined Company-Specific":"S0","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","Tightening Torque For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/729fb1bc35f8986aa0debc5a183c60c5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621534&mlfb=3RU6126-1EB0"},"ai":{"faq":[{"question":"What contactor size does the 3RU6126-1EB0 mount to?","answer":"It is designed for the Siemens S0 contactor frame. The relay fastens directly to the contactor without needing a separate DIN-rail adapter, keeping the motor starter assembly compact at 45 mm wide."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU6126-1EB0","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/3RU6126-1EB0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}