{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-4CB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-4CB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-4CB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-4CB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-4CB0-ZX95 thermal overload relay, CLASS 10, S0 frame size, 11 kW at 400 V, contactor-mount with screw terminals.","salesMarkdown":"The Siemens SIRIUS 3RU2126-4CB0-ZX95 is a thermal overload relay — the part that sits between a contactor and a motor to protect against sustained overcurrent. The S0 frame size is the compact footprint in the SIRIUS family, sized for motor ratings up to 11 kW at 400 V. Mounts directly onto the contactor via the contactor mounting fastening method — no DIN rail needed for the relay itself, though the contactor typically clips onto one. Screw terminals for the main circuit, sized for 2x (0.5... 1.5 mm²) or 2x (0.75... 2.5 mm²) solid or stranded wire. The auxiliary switch is integrated, with contacts rated 2 A at 24 V, 3 A at 120 V, and 2 A at 230 V — enough to signal a trip back to the PLC or annunciator panel. The note \"for message 'Tripped'\" on the auxiliary contact means this is the normally-open set that closes when the relay trips, giving a positive indication.","metaTitle":"Siemens 3RU2126-4CB0-ZX95 SIRIUS thermal overload relay, CLA","metaDescription":"Siemens SIRIUS 3RU2126-4CB0-ZX95 thermal overload relay, CLASS 10, S0 size, 11 kW at 400 V. Current production. Auxiliary contacts rated 2 A at 24 V. Screw terminals, contactor-mou","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":"2.7 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","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":"11 kW","at 480 V rated value":"22 A","at 500 V rated value":"11 kW","at 600 V rated value":"22 A","at 690 V rated value":"18.5 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":"22 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":"22 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":"17 ... 22 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/132c6259452a0d1ef7c3cec12b835705.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=184456&mlfb=3RU2126-4CB0-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2126-4CB0-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What does the note 'for message Tripped' mean?","answer":"It means the auxiliary contact set labeled with that note is the normally-open contact that closes when the overload relay trips, providing a positive signal to a PLC or indicator light."},{"question":"Does the 3RU2126-4CB0-ZX95 comply with RoHS?","answer":"Yes, the substance prohibitance date of 10/01/2009 confirms RoHS compliance from that date forward."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-4CB0-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/3RU2126-4CB0-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}}