{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-1CJ0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-1CJ0","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-1CJ0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1CJ0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-1CJ0 thermal overload relay, Class 10, S0 size, 690 V rated, contactor-mount, auxiliary contact rated 2 A at 24 V.","salesMarkdown":"## Motor protection with Class 10 trip curve The Siemens 3RU2126-1CJ0 is a SIRIUS thermal overload relay designed to protect motors against overload and phase failure. ## Auxiliary contact ratings across voltages These ratings let the relay signal a trip to a PLC input or a holding circuit across common control voltages without an interposing relay. Size S0 — 45 mm wide, 85 mm deep, 85 mm tall — mounts directly onto the matching SIRIUS contactor via the contactor-mounting fastening method, saving DIN-rail space. The ring cable lug connection on the main circuit handles up to M4 screw terminals.","metaTitle":"Siemens 3RU2126-1CJ0 SIRIUS Overload Relay, Class 10, 690 V","metaDescription":"Siemens 3RU2126-1CJ0 SIRIUS thermal overload relay, Class 10 trip, 690 V rated, S0 size, contactor-mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"Tripped\"","Depth":"85 mm","Width":"45 mm","title":"3RU2126-1CJ0","Height":"85 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","at 690 V":"0.75 A","Trip Class":"CLASS 10","Rated Value":"690 V","description":"Overload relay 1.8...2.5 A Thermal For motor protection Size S0, Class 10 Contactor mounting Main circuit: Ring cable lug Auxiliary circuit: ring cable lug Manual-Automatic-Reset","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Contactor mounting","For Main Contacts":"M4","Mounting Position":"any","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":"Ring cable lug connection","Temperature Compensation":"-40 ... +60 °C","MTTF with high demand rate":"2 280 a","Design Of Screwdriver Shaft":"Diameter 5 ... 6 mm","Size Of The Screwdriver Tip":"Pozidriv PZ 2","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","For Auxiliary And Control Circuit":"ring terminal lug connection","Between Main And Auxiliary Circuit":"440 V","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Slide switch","For Main Contacts For Ring Cable Lug":"2.5 ... 2 N·m","Surge Voltage Resistance Rated Value":"6 kV","Of The Auxiliary And Control Contacts":"M3","Between Auxiliary And Auxiliary Circuit":"440 V","reference code according to IEC 81346-2":"F","Number Of Poles For Main Current Circuit":"3","For Auxiliary Contacts For Ring Cable Lug":"0.8 ... 1.2 N·m","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","Outer Diameter Of The Usable Ring Cable Lug Maximum":"7.5 mm","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/da65e1dbe0867b46b831ef36948fd655.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=119307&mlfb=3RU2126-1CJ0"},"ai":{"faq":[{"question":"Where can I buy the 3RU2126-1CJ0 and get a price?","answer":"The 3RU2126-1CJ0 is available through independent distribution. Submit an RFQ for current pricing and lead time on your required quantity."},{"question":"What does the 'for message Tripped' note mean on the 3RU2126-1CJ0?","answer":"The note indicates that the auxiliary contact position corresponds to the tripped state — the normally-closed contact opens when the relay trips, providing a positive signal to the control system."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-1CJ0","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/3RU2126-1CJ0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}