{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU6126-4EB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU6126-4EB1","canonicalUrl":"https://aoctrl.com/siemens/3RU6126-4EB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU6126-4EB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU6126-4EB1 thermal overload relay, size S0, adjustable 27-32 A, Trip Class 10, screw-type terminals, stand-alone installation.","salesMarkdown":"The Siemens SIRIUS 3RU6126-4EB1 is a thermal overload relay for motor protection, sized for the S0 contactor frame. It provides Class 10 tripping protection for three-phase motors drawing between 27 and 32 A full-load current. Rated for a main circuit operating voltage of 690 V and a frequency of 50 to 60 Hz, it handles the common industrial supply range. The adjustable current response value is set via a dial on the front, covering 27 to 32 A. Designed for stand-alone installation, the relay mounts directly to a panel or DIN rail. It can be combined with a S0-size contactor (such as the 3RT1023 series) for a compact motor starter assembly. Dimensions are 97 mm high, 45 mm wide, and 95 mm deep. A 6 mm clearance to grounded side parts is required. Main and auxiliary circuits both use screw-type terminals; tightening torque for the main contacts is 2 to 2.5 N·m. Wire sizes accepted: 2×(0.5 to 1.5 mm²) solid/stranded or 2×(0.75 to 2.5 mm²) for the main circuit, with equivalent AWG ranges of 2×(16 to 12) and 2×(14 to 8). Auxiliary contacts accept 2×(20 to 16) and 2×(18 to 14) AWG. ## Environmental and electrical ratings Operates across -40 to +70 °C ambient, with storage down to -55 °C and transport up to +80 °C. Humidity tolerance is 0 to 90% non-condensing. Installation altitude is limited to 2000 m above sea level. Surge voltage resistance is rated at 6 kV, and insulation voltage at 690 V for pollution degree 3. Shock resistance is 8g for 11 ms per IEC 60068-2-27. Auxiliary contact ratings: 2 A at 24 V, 0.22 A at 110 V, and 2 A at 230 V. Per-pole power dissipation is 3.2 W. Substance prohibitance compliance is documented with a date of 05/01/2012, covering RoHS and REACH requirements. The relay is part of the Siemens SIRIUS family, a widely specified industrial control component line.","metaTitle":"Siemens 3RU6126-4EB1 SIRIUS Overload Relay, 27-32 A, Class 1","metaDescription":"Siemens SIRIUS 3RU6126-4EB1 thermal overload relay, adjustable 27-32 A, Trip Class 10, size S0, screw terminals. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"95 mm","Width":"45 mm","title":"3RU6126-4EB1","Height":"97 mm","at 24 V":"2 A","Per Pole":"3.2 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 27...32 A size S0, class 10, for motor protection stand-alone installation 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":"stand-alone installation","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":"6.9 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":"32 A","for 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","for 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":"9.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"27 ... 32 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c1becdc8941c2456ae821a50ad13ad3d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621548&mlfb=3RU6126-4EB1"},"ai":{"faq":[{"question":"What are the key ratings for this overload relay?","answer":"The adjustable current range is 27 to 32 A with Trip Class 10 protection. It is rated for 690 V operating voltage, 50/60 Hz, and fits the S0 contactor frame. Main and auxiliary circuits use screw-type terminals."},{"question":"What compliance documentation is available?","answer":"Substance prohibitance compliance is documented with a date of 05/01/2012, covering RoHS and REACH requirements. The relay is part of the Siemens SIRIUS family."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU6126-4EB1","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/3RU6126-4EB1 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}}