{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-1EB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-1EB0","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-1EB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1EB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-1EB0 thermal overload relay, Size S0, Trip Class 10, rated 690 V, screw-type terminals, contactor mounting.","salesMarkdown":"## Trip Class 10 — what it means for motor protection The 3RU2126-1EB0 is a SIRIUS thermal overload relay, Size S0, designed to protect motors against overload and phase loss. Power ratings at those voltages: 1.5 kW at 400 V, 2.2 kW at 500 V, 3 kW at 690 V. ## Mounting and wiring — contactor-mount, screw terminals Mounts directly onto the contactor via the fastening method — no DIN rail or separate base required. Dimensions: 85 mm height, 45 mm width, 85 mm depth. Mounting position is any orientation. Temperature compensation is active from -40 °C to +60 °C, so the trip curve stays accurate across the panel ambient range. ## Auxiliary contact ratings and signaling The integrated auxiliary switch provides a 'Tripped' message contact. Contact ratings vary by voltage: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, 0.75 A at 690 V. Lower ratings at 60 V (0.3 A), 110 V (0.22 A), 125 V (0.22 A), and 220 V (0.11 A) — check the specific control voltage when wiring the trip signal back to the PLC input. Per-pole power dissipation is 1.9 W. The auxiliary contact is rated for the full range of control voltages listed — no external interposing relay needed for most 24 VDC or 120 VAC PLC inputs. ## Lifecycle and compliance documentation MTTF with high demand rate is 2280 years.","metaTitle":"Siemens 3RU2126-1EB0 SIRIUS Overload Relay, Class 10, 690 V","metaDescription":"Siemens 3RU2126-1EB0 SIRIUS thermal overload relay, Size S0, Trip Class 10, rated 690 V. Current production. Quoted to order. Screw terminals, contactor mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"Tripped\"","Depth":"85 mm","Width":"45 mm","title":"3RU2126-1EB0","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 2.8...4.0 A Thermal For motor protection Size S0, Class 10 Contactor mounting Main circuit: Screw Auxiliary circuit: Screw 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","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"thermal overload relay","at 400 V rated value":"1.5 kW","at 480 V rated value":"4 A","at 500 V rated value":"2.2 kW","at 600 V rated value":"4 A","at 690 V rated value":"3 kW","Size Of Overload Relay":"S0","For Main Current Circuit":"screw-type terminals","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":"4 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","For Auxiliary And Control Circuit":"screw-type 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 ... 16), 2x (18 ... 14)","Of The Auxiliary And Control Contacts":"M3","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","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 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","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","operational current at AC-3e at 400 V rated value":"4 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":"2.8 ... 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/246f585ac534c5b1e82b10f668421a34.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=407474&mlfb=3RU2126-1EB0"},"ai":{"faq":[{"question":"What does the 'Tripped' note on the 3RU2126-1EB0 mean?","answer":"The auxiliary contact labeled 'Tripped' signals that the overload relay has operated. It's a normally-open contact that closes when the relay trips, providing a status signal to a PLC or indicator light."},{"question":"What is the depth of the 3RU2126-1EB0?","answer":"The depth is 85 mm. Overall dimensions are 85 mm height × 45 mm width × 85 mm depth."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-1EB0","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/3RU2126-1EB0 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}}