{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-1GB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-1GB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-1GB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1GB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-1GB0-ZX95 thermal overload relay, Class 10, size S0, 690 V rated insulation voltage, 85 x 45 x 85 mm, contactor-mount.","salesMarkdown":"## Active production, direct-fit for SIRIUS contactors The 3RU2126-1GB0-ZX95 is a current-production SIRIUS thermal overload relay. It mounts directly onto the matching SIRIUS contactor via the contactor-mounting fastening method — no DIN rail adapter needed, no separate base. The S0 frame size means it mates with the S0 contactor footprint; if your panel was built around a different SIRIUS frame (S00, S2, S3), this relay will not physically lock on. This is the standard class for standard-start induction motors (pumps, fans, compressors) where the start time is under 10 seconds. If your motor has a longer acceleration ramp (high-inertia loads like centrifuges or crushers), a Class 20 or Class 30 relay is needed to avoid nuisance tripping during start. ## Auxiliary contact ratings and wiring The integrated auxiliary switch provides a changeover contact (NC + NO) for the trip signal. The contact ratings vary significantly by voltage: at 24 V it switches 2 A, at 120 V it switches 3 A, at 230 V it drops to 2 A, and at 400 V it is rated 1 A. The DC ratings are lower: 0.3 A at 60 V, 0.22 A at 110 V and 125 V, and 0.11 A at 220 V. The main contact screws are M4. The note on the listing reads 'for message Tripped' — this likely refers to the auxiliary contact function that signals the tripped state, not a separate alarm contact. ## Voltage, power, and temperature envelope At 480 V and 600 V the current rating is 6.3 A. The thermal power dissipation per pole is 2.2 W. Temperature compensation is active from -40 to +60 °C — above 60 °C ambient the relay may not accurately track the motor's thermal state. The MTTF with high demand rate is 2,280 years, which is typical for a passive electromechanical device with no moving parts in the sensing element. ## Compliance and substance restrictions The substance prohibition date is listed as 10/01/2009 — this is the RoHS compliance effective date (RoHS 2 / 2011/65/EU). The relay is designed with a thermal overload release using a bimetal strip, not electronic sensing. The dimensions are 85 mm depth, 45 mm width, and 85 mm height. Mounting position is any.","metaTitle":"Siemens 3RU2126-1GB0-ZX95 SIRIUS Thermal Overload Relay","metaDescription":"Siemens 3RU2126-1GB0-ZX95 SIRIUS thermal overload relay, Class 10 trip, S0 size, 690 V rated insulation voltage, 85x45x85 mm.","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":"3RU2126-1GB0-ZX95","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","Trip Class":"CLASS 10","Rated Value":"690 V","description":"Overload relay 4.5...6.3 A Thermal For motor protection Size S0, Class 10 Contactor mounting Main circuit: Screw Auxiliary circuit: Screw Manual-Automatic-Reset Reusable packaging Pack = 56 units","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 y","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4ce2ebf84fb91337ffc50e421256c51d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=271586&mlfb=3RU2126-1GB0-ZX95"},"ai":{"faq":[{"question":"What does the note 'for message Tripped' mean on this overload relay?","answer":"The listing carries a note 'for message Tripped'. This refers to the integrated auxiliary switch that changes state when the relay trips. It provides a signal (typically a normally-open contact closes, or a normally-closed contact opens) that can be wired to a PLC input or a pilot light to indicate the overload condition. It is not a separate alarm contact — it is the same changeover contact used for the trip indication."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-1GB0-ZX95","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-ZX95 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}}