{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU6126-1CB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU6126-1CB0","canonicalUrl":"https://aoctrl.com/siemens/3RU6126-1CB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU6126-1CB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU6126-1CB0, adjustable 1.8…2.5 A, Trip Class 10, size S0, screw terminals, for contactor mounting.","salesMarkdown":"The Siemens SIRIUS 3RU6126-1CB0 is a thermal overload relay for motor protection, adjustable from 1.8 A to 2.5 A, Trip Class 10, in the size S0 footprint. It mounts directly onto a contactor (contactor mounting) and protects the motor by thermally sensing overcurrent — the bimetallic strip follows the motor heating curve, so a sustained overload above the set point trips the auxiliary contact and drops out the contactor coil. Adjustable current range 1.8…2.5 A sets the trip threshold — set it to the motor nameplate FLA. Class 10 means the relay will trip within 10 seconds at 600 % of the set current, which is the standard for standard-duty induction motors (pumps, fans, compressors) that don't need the longer start-time allowance of Class 20 or 30. Rated insulation voltage 690 V AC and surge voltage resistance 6 kV mean it's rated for 400 V and 480 V line-to-line systems with margin, and it will withstand transient spikes common in industrial panels without flashover. Operating temperature range –40 to +70 °C covers unheated enclosures and hot panel interiors; the relay derates thermally above 40 °C per the curve, but the –40 °C floor means it starts reliably in cold warehouses or outdoor cabinets. Size S0 is the standard Siemens contactor frame for currents up to roughly 40 A AC-3. The 3RU6126-1CB0 snaps onto the contactor (contactor mounting) — no DIN rail needed, though the contactor itself may be DIN-rail or screw-mounted. Accepts 2 x (0.5…1.5 mm²) or 2 x (0.75…2.5 mm²) solid/stranded, and AWG equivalents. Any mounting position is allowed.","metaTitle":"Siemens SIRIUS 3RU6126-1CB0 Overload Relay, 1.8…2.5 A, Class","metaDescription":"Siemens SIRIUS 3RU6126-1CB0 thermal overload relay, adjustable 1.8…2.5 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":"3RU6126-1CB0","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 1.8...2.5 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":"5.1 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":"2.5 A","for AWG cables for main contacts":"2x (20 ... 16), 2x (20 ... 18), 2x 12","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":"1.8 ... 2.5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4fa09152df048615dfc853f9b80d55f1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621532&mlfb=3RU6126-1CB0"},"ai":{"faq":[{"question":"Where can I buy 3RU6126-1CB0 and how do I get a price?","answer":"This part is 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 price and lead time."},{"question":"What is 3RU6126-1CB0's listed depth?","answer":"Depth is 85 mm, width 45 mm, height 85 mm. The S0 footprint matches the standard Siemens contactor frame; verify panel clearance for the 85 mm depth behind the contactor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU6126-1CB0","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/3RU6126-1CB0 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}}