{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-4CB0-ZW96","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-4CB0-ZW96","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-4CB0-ZW96","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-4CB0-ZW96","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU2126-4CB0-ZW96, CLASS 10, S0 size, 690 V rated insulation, contactor mounting.","salesMarkdown":"The relay is sized as S0, the compact frame in the SIRIUS family, designed to mount directly onto the matching S0 contactor (e.g. 3RT20xx) via the contactor mounting fastening method — no separate base or DIN-rail adapter needed. The relay carries motor power ratings at several common line voltages: 11 kW at 400 V, 11 kW at 500 V, and 18.5 kW at 690 V. At 480 V and 600 V the listed current ratings are 22 A each. These are the AC-3e rated values — the duty cycle for starting and running a standard induction motor. If your BOM specifies a 22 A motor at 480 V, this relay covers it. Auxiliary contact ratings are given across multiple control voltages: 2 A at 24 V and 230 V, 3 A at 120 V, 1 A at 400 V, and lower values for 60 V, 110 V, 125 V, and 220 V. These are the switching capacities for the integrated auxiliary switch — the signal that tells the PLC \"motor tripped.\" The note \"for message 'Tripped'\" on the order code confirms this variant includes a dedicated signaling contact for that status. Thermal power dissipation per pole is 2.7 W. In a densely packed panel with multiple relays, that heat adds up — factor it into your enclosure thermal budget, especially if the ambient inside the cabinet approaches the 70 °C operating limit. Mounts directly onto the S0 contactor — no separate DIN-rail footprint, no extra wiring between contactor and relay. The fastening method is \"contactor mounting\": the relay clips onto the contactor's body and the main power connections pass through. Screw-type terminals on the main current circuit accept 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded wire. The screwdriver spec is Pozidriv PZ2, shaft diameter 5–6 mm. Temperature compensation is active from -40 °C to +60 °C, meaning the trip curve stays accurate across that ambient range. The substance prohibitance date of 10/01/2009 indicates RoHS compliance to the original EU directive. As a current-production Siemens industrial component, it also carries the expected CE, UL, and CSA approvals (typical for the SIRIUS family), though specific cert numbers are not listed in this spec excerpt. For a pharmaceutical GMP application, the documentation package (declaration of conformity, material certificates) should be obtainable from Siemens support.","metaTitle":"Siemens 3RU2126-4CB0-ZW96 SIRIUS Thermal Overload Relay, CLA","metaDescription":"Siemens 3RU2126-4CB0-ZW96 SIRIUS thermal overload relay, CLASS 10 trip, S0 size, 690 V rated insulation, contactor-mounted. Current production.","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/98a4e9870e2793a3596c0805be796aa5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=447912&mlfb=3RU2126-4CB0-ZW96","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2126-4CB0-ZW96/alternatives.json"},"ai":{"faq":[{"question":"What does the note 'for message Tripped' on the order code mean?","answer":"It means this variant includes an integrated auxiliary switch that provides a dedicated signaling contact specifically for reporting the tripped state of the relay to a PLC or indicator light."},{"question":"What are the key motor ratings for this relay?","answer":"At 400 V and 500 V it is rated for 11 kW motor loads. At 690 V it is rated for 18.5 kW. At 480 V and 600 V the current rating is 22 A. These are AC-3e values for standard induction motor starting and running."},{"question":"Does this relay mount on a DIN rail or directly on a contactor?","answer":"It mounts directly onto a Siemens S0-size contactor via the contactor mounting fastening method. It does not require a separate DIN-rail base."},{"question":"What compliance documentation is available for this part?","answer":"The spec shows a substance prohibitance date of 10/01/2009, confirming RoHS compliance to the original directive. As a current Siemens SIRIUS product, it typically carries CE, UL, and CSA marks, and a declaration of conformity should be available from Siemens."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-4CB0-ZW96","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-ZW96 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}}