{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1126-1KB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1126-1KB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU1126-1KB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1126-1KB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, Size S0, Class 10 trip, screw-type terminals, 3 poles, 96 mm depth, IP20 front.","salesMarkdown":"The 3RU1126-1KB0-ZX95: The Class 10 trip class means this relay will trip within 10 seconds at 7.2× the thermal current setting. This is the standard for standard-duty induction motor starting — it allows the motor to accelerate under load without nuisance tripping, but clears quickly on a stalled rotor. For motors with longer acceleration times (high-inertia loads like fans or centrifuges), a Class 20 or 30 relay would be required. The Size S0 frame is the most common Siemens overload relay footprint, designed for direct mounting to S0 contactors (e.g., 3RT1023 series). The main circuit terminals accept solid conductors: 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), with corresponding AWG ranges of 2x (16... 12) and 2x (14... 8). This covers the typical control wiring for motor circuits up to the S0 current range. The auxiliary/control circuit terminals accept 2x (20... 16) and 2x (18... 14) AWG. The surge voltage resistance rated at 6 kV, per the specification, ensures the relay withstands transient overvoltages common in industrial environments without insulation breakdown. This is a key parameter for panel builders verifying coordination with upstream surge protection devices. This relay mounts directly onto the contactor via the fastening method specified as 'Contactor mounting' — no additional DIN-rail adapter or bracket is needed for the S0 frame. The mounting position allows rotation of ±135° on a vertical surface and tilting of ±45° to the front and back, giving flexibility for tight panel layouts where the contactor is not perfectly upright. This is standard for inside-cabinet installation; no washdown or outdoor rating is claimed. The 100 % relative humidity during operation rating confirms suitability for unconditioned enclosures in humid environments, as long as condensation is managed. The ATEX approval (DMT 98 ATEX G 001) permits installation in potentially explosive gas atmospheres, specifically for Group II equipment. This is a critical differentiator — not all SIRIUS overload relays carry this certification. For tender specifications requiring ATEX compliance, this variant satisfies that clause without an external interface module. The substance prohibitance date of 07/01/2006 aligns with the EU RoHS compliance timeline. The part carries the reference code 'F' per IEC 81346-2, which designates a protective device in the classification system — useful for panel documentation and audit trails. The shock resistance of 8g for 10 ms is typical for industrial control gear mounted in a panel on a machine subject to vibration. This zero-clearance design on five of six sides allows dense packing of contactor-relay pairs.","metaTitle":"Siemens 3RU1126-1KB0-ZX95 SIRIUS Thermal Overload Relay, Siz","metaDescription":"Siemens SIRIUS 3RU1126-1KB0-ZX95 thermal overload relay, Size S0, Class 10 trip. Current production. ATEX approved. 96 mm depth. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"96 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"45 mm","Height":"97 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","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","Backwards":"0 mm","Downwards":"0 mm","Trip Class":"CLASS 10","At The Side":"6 mm","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Contactor mounting","Shock Resistance":"8g / 10 ms","Mounting Position":"with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back","Product Brand Name":"SIRIUS","Type Of Protection":"DMT 98 ATEX G 001","Product Designation":"thermal overload relay","Size Of Overload Relay":"S0","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"07/01/2006","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"100 %","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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","Touch Protection Against Electrical Shock":"finger-safe","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Size Of Contactor Can Be Combined Company-Specific":"S0","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/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":"9 ... 12.5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=273822&mlfb=3RU1126-1KB0-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1126-1KB0-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"The width is 45 mm, height is 97 mm, and depth is 96 mm. Clearance requirements are 0 mm upwards, forwards, backwards, and downwards, with 6 mm required at the side. This allows dense packing when mounted directly on a contactor."},{"question":"What compliance certifications does this part carry?","answer":"The part carries ATEX approval (DMT 98 ATEX G 001) for gas atmospheres. The substance prohibitance date of 07/01/2006 aligns with RoHS compliance. The reference code per IEC 81346-2 is 'F' (protective device)."},{"question":"What wire sizes does the main circuit accept?","answer":"The main circuit screw terminals accept solid conductors: 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), with AWG equivalents of 2x (16... 12) and 2x (14... 8). Auxiliary contacts accept 2x (20... 16) and 2x (18... 14) AWG."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1126-1KB0-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/3RU1126-1KB0-ZX95 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}}