{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-1KB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-1KB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-1KB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1KB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU2126-1KB0-ZX95, CLASS 10, S0 size, 690 V rated, with integrated auxiliary switch and screw terminals.","salesMarkdown":"The relay mounts directly onto a contactor (fastening method: contactor mounting), so it shares the same DIN-rail or screw-panel footprint as the contactor it pairs with, keeping the panel layout compact. The integrated auxiliary switch provides a signal output — a 'Tripped' message — that can be wired into the PLC or annunciator. Its contact ratings vary by voltage: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V. These are the maximum continuous currents the auxiliary contacts can switch at those voltages; for DC applications the ratings drop significantly (0.3 A at 60 V, 0.22 A at 110 V, 0.11 A at 220 V). The auxiliary switch is designed as an integrated part of the relay — no separate add-on module needed — which simplifies ordering and panel wiring. ## Environmental and mounting details The relay is temperature-compensated over -40 to +60 °C, so the trip curve stays accurate across the typical panel ambient range. Dimensions are 85 mm depth, 45 mm width, 85 mm height — the S0 footprint common to this Siemens series. Screw terminals accept 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded wire, with a Pozidriv PZ2 screwdriver tip. The substance prohibitance date of 10/01/2009 indicates RoHS compliance per the EU directive.","metaTitle":"Siemens 3RU2126-1KB0-ZX95 SIRIUS Thermal Overload Relay, CLA","metaDescription":"Siemens 3RU2126-1KB0-ZX95 SIRIUS thermal overload relay, CLASS 10 trip, S0 size, 690 V rated. Auxiliary contact ratings: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V. Sour","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","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":"5.5 kW","at 480 V rated value":"12.5 A","at 500 V rated value":"7.5 kW","at 600 V rated value":"12.5 A","at 690 V rated value":"7.5 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":"12.5 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":"12.5 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":"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=227928&mlfb=3RU2126-1KB0-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1KB0-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class of 3RU2126-1KB0-ZX95?","answer":"It is a CLASS 10 trip class relay, tripping within 10 seconds at 7.2× the set current."},{"question":"What are the auxiliary contact ratings for 3RU2126-1KB0-ZX95?","answer":"The auxiliary switch is rated 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V for AC; for DC the ratings are 0.3 A at 60 V, 0.22 A at 110 V, and 0.11 A at 220 V."},{"question":"Where can I buy 3RU2126-1KB0-ZX95?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 3RU2126-1KB0-ZX95?","answer":"The substance prohibitance date of 10/01/2009 indicates RoHS compliance per the EU directive. Additional compliance documentation (UL, IEC, REACH) is typically available from the manufacturer upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-1KB0-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/3RU2126-1KB0-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}}