{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-1FB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-1FB0","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-1FB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1FB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-1FB0, size S0 thermal overload relay, Trip Class 10, with integrated auxiliary switch for trip signaling, 690 V rated.","salesMarkdown":"The Siemens 3RU2126-1FB0 SIRIUS thermal overload relay, size S0, Trip Class 10, snaps directly onto a matching contactor frame. The integrated auxiliary switch (Noted as 'for message Tripped') provides a dry contact to signal the tripped state back to a PLC or HMI — no separate auxiliary block needed for basic fault indication. Direct contactor mounting — no DIN-rail base required. Accepts a single M4 screw for each main circuit terminal; wire capacity: 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²) solid or stranded. Screwdriver tip Pozidriv PZ2, shaft diameter 5–6 mm. Mounting position any. Temperature compensation active from -40°C to +60°C ambient, so trip current stays within curve even when the panel runs hot or cold. RoHS compliance dated 10/01/2009 per the substance prohibitance entry.","metaTitle":"Siemens 3RU2126-1FB0 SIRIUS Overload Relay Class 10 S0","metaDescription":"Active-production thermal overload relay, size S0, Trip Class 10. Auxiliary switch signals tripped message. 690 V rated, mounts on SIRIUS contactor. RoHS compliant per 10/01/2009 s","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","Height":"85 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"2.2 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","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":"5 A","at 500 V rated value":"2.2 kW","at 600 V rated value":"5 A","at 690 V rated value":"4 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":"5 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":"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":"6.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"3.5 ... 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$30.48","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=363985&mlfb=3RU2126-1FB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1FB0/alternatives.json"},"ai":{"faq":[{"question":"What does the Note 'for message Tripped' mean?","answer":"It indicates an integrated auxiliary switch that closes or opens when the overload relay trips, providing a dry-contact signal for a PLC, HMI, or alarm circuit."},{"question":"What is the depth of this overload relay?","answer":"85 mm depth, with a 45 mm width and 85 mm height. These dimensions matter for gland-plate clearance and side-by-side contactor spacing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-1FB0","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/3RU2126-1FB0 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}}