{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU7126-4CB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU7126-4CB0","canonicalUrl":"https://aoctrl.com/siemens/3RU7126-4CB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU7126-4CB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, Size S0, 22 A rated current, Trip Class 10, IP20, 3RU7126-4CB0.","salesMarkdown":"The Siemens 3RU7126-4CB0 is a SIRIUS thermal overload relay in Size S0, rated at 22 A operational current with Trip Class 10 protection. It mounts directly to a Size S0 contactor, making it a drop-in thermal protection element for motor starters in control panels. The 22 A rated current sets the motor FLA it can protect — size the relay to the motor nameplate, not the contactor. Size S0 frames the physical envelope: 45 mm wide, 97 mm tall, 96 mm deep. It belongs inside an IP54 or higher enclosure, not in a splash zone.","metaTitle":"Siemens 3RU7126-4CB0 SIRIUS Thermal Overload Relay, 22 A, Cl","metaDescription":"Siemens 3RU7126-4CB0 SIRIUS thermal overload relay, 22 A rated current, Trip Class 10, Size S0, IP20, active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"96 mm","Width":"45 mm","Height":"97 mm","at 24 V":"3 A","Per Pole":"2.7 W","at 230 V":"2 A","Trip Class":"CLASS 10","On The Front":"IP20","Of The Terminal":"IP20","lifecycle_stage":"current","During Operation":"-20 ... +55 °C","During Transport":"-25 ... +70 °C","Fastening Method":"Contactor mounting","Mounting Position":"with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Thermal overload relay","Size Of Overload Relay":"S0","For Main Current Circuit":"screw-type terminals","power loss [W] total typical":"8.1 W","Operating Voltage Rated Value":"690 V","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"22 A","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"0 ... 90 %","Surge Voltage Resistance Rated Value":"6 kV","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","Type Of Voltage For Main Current Circuit":"AC/DC","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","shock resistance according to IEC 60068-2-27":"8g / 11 ms","Required Spacing For Grounded Parts At The Side":"6 mm","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","Size Of Contactor Can Be Combined Company-Specific":"S0","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","operational current of auxiliary contacts at DC-13 at 24 V":"1 A","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","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":"17 ... 22 A","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A, quick: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/54c077c58a43674fcd61296c30498538.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1534247&mlfb=3RU7126-4CB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU7126-4CB0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RU7126-4CB0 and get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What are the key ratings of 3RU7126-4CB0?","answer":"Rated operational current 22 A, Trip Class 10, Size S0, IP20 front and terminal, operating temperature -20 to +55 °C."},{"question":"Will 3RU7126-4CB0 drop into a panel specified around 3RU2116-1FC1?","answer":"Both are Size S0 overload relays with the same mounting footprint and contactor interface, so the 3RU7126-4CB0 fits the same panel layout without rewiring. The main difference is the current range — verify the 22 A rating matches your motor FLA."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU7126-4CB0","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/3RU7126-4CB0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}