{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-4BB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-4BB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-4BB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-4BB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-4BB0-ZX95 thermal overload relay, CLASS 10, S0 size, 690 V rated, 85 mm depth, screw terminals, contactor mounting.","salesMarkdown":"## SIRIUS thermal overload relay for motor protection The Siemens 3RU2126-4BB0-ZX95 is a SIRIUS thermal overload relay, size S0, designed for direct mounting onto a contactor to protect motors against overload and phase loss. ## Auxiliary contact and tripped signal The relay includes an integrated auxiliary switch with a dedicated 'Tripped' message contact — the note 'for message Tripped' means this variant has a separate signal contact that changes state when the relay trips, so a PLC or indicator can register the fault without wiring through the main contactor coil circuit. Dimensions are 85 mm wide × 85 mm high × 45 mm deep — the S0 footprint is the smallest SIRIUS overload relay size, so it fits tightly on a contactor in a crowded DIN-rail enclosure. Mounting is direct onto the contactor via the fastening method 'contactor mounting' — no separate DIN-rail clip needed; the relay snaps onto the contactor and the power connections pass through. ## Environmental range and compliance RoHS compliance date is 10/01/2009 — the part meets the EU RoHS directive for restricted substances.","metaTitle":"Siemens 3RU2126-4BB0-ZX95 SIRIUS Thermal Overload Relay","metaDescription":"Siemens 3RU2126-4BB0-ZX95 SIRIUS thermal overload relay, CLASS 10 trip, S0 size, 690 V rated, 85 mm depth. Active production, sourced to order. Request a quote.","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":"3RU2126-4BB0-ZX95","Height":"85 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"2.7 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 14...20 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":"7.5 kW","at 480 V rated value":"20 A","at 500 V rated value":"11 kW","at 600 V rated value":"20 A","at 690 V rated value":"15 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":"20 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":"20 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":"8.1 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"14 ... 20 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/48a249a1ea2e39dbbe79b8bb1f49ce48.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=123480&mlfb=3RU2126-4BB0-ZX95"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-4BB0-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/3RU2126-4BB0-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}}