{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU6126-4EB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU6126-4EB0","canonicalUrl":"https://aoctrl.com/siemens/3RU6126-4EB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU6126-4EB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU6126-4EB0 thermal overload relay, adjustable 27-32 A, Class 10, Size S0, screw terminals for main and auxiliary circuits, 690 V rated.","salesMarkdown":"It mounts directly onto Size S0 contactors, saving panel space and wiring. The relay uses a thermal bimetallic release, so it responds to the motor's actual heating curve — not just instantaneous current — which makes it a solid fit for standard induction motor starting duty where the rotor is locked for under 10 seconds. The adjustable current range of 27 to 32 A sets the full-load motor current the relay protects. The relay is rated for a main circuit operating voltage of 690 V and an insulation voltage of 690 V with pollution degree 3, so it is suitable for 400 V and 480 V systems with margin. The relay fastens directly onto a Size S0 contactor — no separate base or wiring between contactor and overload. The main circuit uses screw-type terminals accepting 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²) solid or stranded, or AWG 16-12 and 14-8. Auxiliary circuit terminals are also screw-type, accepting 2x (20-16) or 2x (18-14) AWG. Tightening torque for main contacts is 2 to 2.5 N·m. Required side spacing to grounded parts is 6 mm.","metaTitle":"Siemens 3RU6126-4EB0 Thermal Overload Relay, 27-32 A, Class","metaDescription":"Siemens SIRIUS 3RU6126-4EB0 thermal overload relay, 27-32 A adjustable, Class 10, Size S0. Screw terminals, 690 V rated. Current production. Available 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":"3RU6126-4EB0","Height":"85 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 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":"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","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":"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/c233bdbc8f0e4e8ec73e618486d5f5e9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621547&mlfb=3RU6126-4EB0"},"ai":{"faq":[{"question":"What is the adjustable current range of 3RU6126-4EB0?","answer":"The adjustable current response value is 27 to 32 A. Set it to match the motor's full-load amperage."},{"question":"What trip class is 3RU6126-4EB0?","answer":"It is Class 10, meaning it will trip within 10 seconds under locked-rotor conditions, matching standard induction motor starting."},{"question":"Where can I buy 3RU6126-4EB0?","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":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU6126-4EB0","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/3RU6126-4EB0 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}}