{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-1CC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-1CC0","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-1CC0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1CC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-1CC0 thermal overload relay, Size S0, Trip Class 10, 690 V rated voltage, 50/60 Hz, contactor mounting with spring-loaded terminals.","salesMarkdown":"It mounts directly to a contactor, making it a matched pair in a motor starter assembly. Rated for 690 V at 50/60 Hz, this relay covers 400 V, 480 V, 500 V, and 690 V motor systems. The power ratings at each voltage tell you the maximum motor it can protect: 0.75 kW at 400 V, 1.1 kW at 500 V, and 1.5 kW at 690 V. The auxiliary contact is integrated and rated 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V — these are the switching capacities for the trip-signal circuit, not the motor current. The thermal release design means ambient temperature affects the trip curve; temperature compensation is active from -40 to +60 °C, so the relay holds its calibration across the panel's operating range. Power dissipation is 1.9 W per pole, which adds about 5.7 W total heat inside the enclosure. In a dense panel with multiple starters, that heat load matters for the thermal design — account for it in the ventilation or derating calculation. Fastens directly to the contactor — no DIN rail required for the relay itself, though the contactor typically snaps onto one. The main circuit uses spring-loaded terminals accepting 2× (0.5 to 2.5 mm²) solid or stranded wire. A 3 mm diameter screwdriver shaft (3.0 × 0.5 mm tip) releases the spring clamp. Dimensions: 45 mm wide, 102 mm high, 84 mm deep — Size S0 footprint.","metaTitle":"Siemens 3RU2126-1CC0 SIRIUS Thermal Overload Relay, Size S0,","metaDescription":"Siemens 3RU2126-1CC0 SIRIUS thermal overload relay, Size S0, Trip Class 10. Rated 690 V, 50/60 Hz. Contactor mounting, spring-loaded terminals. Current production. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"Tripped\"","Depth":"84 mm","Width":"45 mm","Height":"102 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"1.9 W","at 110 V":"0.22 A","at 120 V":"3 A","at 125 V":"0.22 A","at 220 V":"0.11 A","at 230 V":"2 A","at 400 V":"1 A","Trip Class":"CLASS 10","Rated Value":"690 V","During Storage":"-55 ... +80 °C","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 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"thermal overload relay","at 400 V rated value":"0.75 kW","at 480 V rated value":"2.5 A","at 500 V rated value":"1.1 kW","at 600 V rated value":"2.5 A","at 690 V rated value":"1.5 kW","Size Of Overload Relay":"S0","For Main Current Circuit":"spring-loaded terminals","Temperature Compensation":"-40 ... +60 °C","MTTF with high demand rate":"2 280 y","Design Of Screwdriver Shaft":"Diameter 3 mm","Size Of The Screwdriver Tip":"3,0 x 0,5 mm","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"10/01/2009","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"2.5 A","at AWG cables for main contacts":"1x (18 ... 8)","For Auxiliary And Control Circuit":"spring-loaded terminals","Between Main And Auxiliary Circuit":"440 V","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Between Auxiliary And Auxiliary Circuit":"440 V","reference code according to IEC 81346-2":"F","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","Finely Stranded Without Core End Processing":"2x (0.5 ... 1.5 mm²)","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","shock resistance according to IEC 60068-2-27":"8g / 11 ms","operational current at AC-3e at 400 V rated value":"2.5 A","Size Of Contactor Can Be Combined Company-Specific":"S0","contact rating of auxiliary contacts according to UL":"B600 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 6 A, quick: 10 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5686aa06ecb56afea412b0bb4c381765.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=449773&mlfb=3RU2126-1CC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1CC0/alternatives.json"},"ai":{"faq":[{"question":"What does the note 'for message Tripped' mean?","answer":"The note indicates that the auxiliary contact on this relay is wired to signal a 'Tripped' status — it closes or opens when the overload relay has operated, sending a fault message to the PLC or indicator."},{"question":"What are the key electrical ratings for the 3RU2126-1CC0?","answer":"Rated voltage is 690 V at 50/60 Hz. The auxiliary contact is rated 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V. Power dissipation is 1.9 W per pole. Trip Class is 10."},{"question":"What compliance documentation is available?","answer":"The substance prohibition date of 10/01/2009 indicates RoHS compliance. The relay carries Siemens SIRIUS brand documentation including the standard CE declaration and UL/CSA file numbers typical for this series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-1CC0","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/3RU2126-1CC0 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}}