{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU6126-1HB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU6126-1HB0","canonicalUrl":"https://aoctrl.com/siemens/3RU6126-1HB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU6126-1HB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU6126-1HB0 thermal overload relay, Size S0, adjustable 5.5-8 A, Trip Class 10, screw terminals, for contactor mounting.","salesMarkdown":"The 3RU6126-1HB0 is a SIRIUS thermal overload relay with an adjustable current response range of 5.5 to 8 A and Trip Class 10. The 8 A rated operational current at 690 V covers most small-to-medium motor loads in 400 VAC three-phase systems. The Size S0 footprint is designed for direct mounting onto S0 contactors, saving panel space and wiring labor. Mounts directly onto S0 contactors via the contactor mounting method — no DIN rail required, though it can be snapped onto one if needed. The any mounting position flexibility means you can orient it vertically or horizontally inside the panel without derating. Screw-type terminals on both main and auxiliary circuits accept 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²). Tightening torque for main contacts is 2 to 2.5 N·m. The 45 mm width and 85 mm depth fit standard S0 contactor spacing; allow 6 mm clearance to grounded parts at the side. Operating temperature range -40 to +70 °C; transport range -55 to +80 °C. Relative humidity 0 to 90% during operation. Installation altitude up to 2000 m. Shock resistance 8g / 11 ms per IEC 60068-2-27. RoHS compliance date of 05/01/2012 covers EU substance restrictions. Insulation voltage 690 V at pollution degree 3, surge voltage resistance 6 kV.","metaTitle":"Siemens 3RU6126-1HB0 SIRIUS Overload Relay, 5.5-8 A, Class 1","metaDescription":"Siemens 3RU6126-1HB0 SIRIUS thermal overload relay, adjustable 5.5-8 A, Trip Class 10, 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":"3RU6126-1HB0","Height":"85 mm","at 24 V":"2 A","Per Pole":"2.2 W","at 110 V":"0.22 A","at 230 V":"2 A","Trip Class":"CLASS 10","description":"Overload relay 5.5...8.0 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":"6 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":"8 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":"6.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"5.5 ... 8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a921e40dcc2f5f2eec86329f3c237941.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621537&mlfb=3RU6126-1HB0"},"ai":{"faq":[{"question":"Where can I buy 3RU6126-1HB0 and what is the lead time?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time."},{"question":"What is the adjustable current range on this overload relay?","answer":"The 3RU6126-1HB0 adjusts from 5.5 to 8 A. Set the dial to match the motor FLA; the Class 10 trip curve protects standard induction motors during start-up."},{"question":"Will 3RU6126-1HB0 fit a panel designed for 3RV1011-1HA10?","answer":"The 3RU6126-1HB0 is a thermal overload relay (Size S0, contactor-mount), while 3RV1011-1HA10 is a motor circuit breaker (DIN-rail mount). They serve different functions — the overload relay requires a separate contactor for switching, whereas the motor circuit breaker combines protection and switching. Panel rewiring would be needed."},{"question":"What compliance documentation does Siemens provide for 3RU6126-1HB0?","answer":"RoHS compliance dated 05/01/2012 covers EU substance restrictions. The relay is rated for 690 V insulation voltage at pollution degree 3 and 6 kV surge voltage resistance. Standard Siemens declarations of conformity and UL/CSA certifications are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU6126-1HB0","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/3RU6126-1HB0 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}}