{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-1GB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-1GB0","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-1GB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1GB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-1GB0 thermal overload relay, size S0, Class 10, rated 690 V, contactor mounting, screw terminals.","salesMarkdown":"The integrated auxiliary switch signals a tripped condition (the part's own note reads \"for message Tripped\"). Class 10 means the relay must trip within 10 seconds at a 7.2× current overload — standard for protecting standard squirrel-cage motors during start-up. The 690 V rated value covers 400 V and 480 V systems with headroom; at 400 V the motor power rating is 2.2 kW, at 500 V it is 3 kW, and at 690 V it reaches 4 kW. Auxiliary contact ratings span the control voltage range: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, and 0.75 A at 690 V — so the same relay works across 24 VDC control circuits and 230 VAC contactor coils without a separate interface relay. Fastening method is contactor mounting — the relay clips onto the matching SIRIUS contactor without extra hardware. Mounting position is any orientation. The screw terminals accept 2 × (0.5 … 1.5 mm²) or 2 × (0.75 … 2.5 mm²) solid or stranded wire; use a Pozidriv PZ 2 tip with a 5–6 mm diameter shaft. Dimensions: 85 mm high, 45 mm wide, 85 mm deep — the S0 frame fits standard 45 mm-wide DIN-rail contactor footprints. Temperature compensation is active from –40 to +60 °C, so the trip curve stays accurate across the typical panel ambient. The substance prohibitance date of 10/01/2009 aligns with early RoHS compliance milestones. MTTF with high demand rate is 2 280 years — a reliability figure for safety-instrumented-function assessments.","metaTitle":"Siemens 3RU2126-1GB0 SIRIUS thermal overload relay, Class 10","metaDescription":"Siemens SIRIUS 3RU2126-1GB0 thermal overload relay, size S0, Class 10 trip, rated 690 V, for contactor mounting. Current production. Sourced to order.","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":"2.2 kW","at 480 V rated value":"6.3 A","at 500 V rated value":"3 kW","at 600 V rated value":"6.3 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":"6.3 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":"6.3 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":"4.5 ... 6.3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$93.20","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/82b722efdea9f8fa9a8c7605dbfef441.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=203021&mlfb=3RU2126-1GB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1GB0/alternatives.json"},"ai":{"faq":[{"question":"What does the 'for message Tripped' note mean?","answer":"The relay's integrated auxiliary switch is wired to signal a 'Tripped' condition — typically to a PLC input or indicator lamp — when the overload has operated."},{"question":"What are the mounting dimensions?","answer":"85 mm high, 45 mm wide, 85 mm deep. Size S0 frame mounts directly onto a SIRIUS contactor."},{"question":"What wire sizes does the screw terminal accept?","answer":"2 × (0.5 … 1.5 mm²) or 2 × (0.75 … 2.5 mm²) solid or stranded. Use a Pozidriv PZ 2 screwdriver."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-1GB0","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/3RU2126-1GB0 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}}