{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU6126-4AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU6126-4AB0","canonicalUrl":"https://aoctrl.com/siemens/3RU6126-4AB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU6126-4AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU6126-4AB0 thermal overload relay, adjustable current response 11-16 A, Trip Class 10, size S0 for contactor mounting, screw-type terminals on main and auxiliary circuits, 690 V rated voltage, 50-60 Hz.","salesMarkdown":"## Motor protection relay, 11-16 A, screws down to the contactor The Siemens 3RU6126-4AB0 is a SIRIUS thermal overload relay with an adjustable current response value of 11 to 16 A, sized for motor protection in a standard 3-phase circuit up to 690 V at 50-60 Hz. Trip Class 10 means it trips fast enough to protect a motor during a stalled-rotor condition without nuisance-tripping on a normal start — the sweet spot for most general-purpose induction motors driving pumps, fans, and conveyors. This relay mounts directly onto a S0-size contactor — no separate DIN-rail footprint to budget for in the panel layout. The 45 mm width and 85 mm depth match the contactor's envelope, so the assembly wires up clean as a single unit. ## Screw terminals, Class 10 thermal curve, and what the ratings actually mean for the panel Auxiliary circuit terminals take 2x (20-16 AWG) or 2x (18-14 AWG). That's a standard screw-clamp that holds firm under thermal cycling — no spring clips to fight. The thermal overload release is ambient-compensated from -40 to +70 °C during operation, with a relative humidity ceiling of 90 %. Power loss runs 6.1 W typical at rated current, climbing to 8.1 W in hot operating state at AC. At 2.7 W per pole, the heat stays manageable inside a grouped starter column — no forced cooling required for most builds. That covers the transient environment of a 480 V industrial panel without external suppression. ## Current production — sourced per RFQ through independent distribution This relay is sourced to order against your BOM quantity through independent distribution channels. Submit an RFQ for the exact quantity and delivery window your line needs.","metaTitle":"Siemens 3RU6126-4AB0 SIRIUS Thermal Overload Relay, 11-16 A","metaDescription":"Siemens 3RU6126-4AB0 SIRIUS thermal overload relay, adjustable 11-16 A, Trip Class 10, S0 size, screw terminals. Active 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":"3RU6126-4AB0","Height":"85 mm","at 24 V":"2 A","Per Pole":"2.7 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 11...16 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":"6.1 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":"16 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":"8.1 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"11 ... 16 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2fb769d374186ff7da7c4f13313e1994.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621540&mlfb=3RU6126-4AB0"},"ai":{"faq":[{"question":"What is the adjustable current range for this overload relay?","answer":"The adjustable current response value is 11 to 16 A. This sets the motor full-load amperage window the relay protects — set the dial to match the motor nameplate FLA within that band."},{"question":"What compliance documentation does Siemens provide for the 3RU6126-4AB0?","answer":"The relay carries a substance prohibitance date of 05/01/2012, indicating RoHS compliance. The insulation voltage, surge voltage resistance, and shock/vibration ratings are tested to IEC 60068-2-27 and pollution degree 3 standards. Full declaration documentation (RoHS, REACH, UL, IEC) is available from Siemens upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU6126-4AB0","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/3RU6126-4AB0 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}}