{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU6126-1DB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU6126-1DB0","canonicalUrl":"https://aoctrl.com/siemens/3RU6126-1DB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU6126-1DB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU6126-1DB0 thermal overload relay, size S0, adjustable current 2.2...3.2 A, Class 10 trip, screw terminals, for contactor mounting.","salesMarkdown":"## Motor FLA match and trip timing The 3RU6126-1DB0 is a SIRIUS thermal overload relay with an adjustable current response range of 2.2 to 3.2 A. That 2.2-3.2 A window is the motor full-load amperage it protects — set the dial to the motor nameplate FLA and the bimetallic strip tracks the thermal load. For a 3 A motor drawing 21 A locked-rotor, the relay trips fast enough to prevent winding damage before the upstream breaker sees the fault. ## Mounts onto the contactor, not the rail Fastening method is contactor mounting — this relay snaps directly onto a size S0 Siemens contactor, sharing the same panel footprint. No DIN rail slot consumed; the assembly occupies the same 45 mm width as the contactor itself. ## Wiring and terminal capacity Main circuit and auxiliary circuit both use screw-type terminals. Tightening torque is 2 to 2.5 N·m. The 6 mm required spacing to grounded parts at the side is the clearance to keep — tighter than that and the 6 kV surge voltage rating may not hold. ## Environmental tolerance and approvals Operating temperature spans -40 to +70 °C, with transport limits from -55 to +80 °C. Relative humidity during operation is 0 to 90 %. Installation altitude maximum is 2 000 m above sea level. Shock resistance per IEC 60068-2-27 is 8 g for 11 ms. The insulation voltage at pollution degree 3 is 690 V AC, matching the rated operating voltage of 690 V at 50...60 Hz.","metaTitle":"Siemens 3RU6126-1DB0 SIRIUS Overload Relay, 2.2-3.2 A","metaDescription":"Siemens 3RU6126-1DB0 SIRIUS thermal overload relay, adjustable 2.2-3.2 A, Class 10 trip, size S0 for contactor mounting. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"85 mm","Width":"45 mm","title":"3RU6126-1DB0","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 2.2...3.2 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":"5.2 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":"3.2 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":"5.7 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"2.2 ... 3.2 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5fc51ee4628f7dc2c10153807df6542d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621533&mlfb=3RU6126-1DB0"},"ai":{"faq":[{"question":"What is the adjustable current range of the 3RU6126-1DB0?","answer":"The adjustable current response value is 2.2 to 3.2 A. Set the dial to match the motor nameplate FLA within that window."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU6126-1DB0","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/3RU6126-1DB0 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}}