{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2126-1JB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2126-1JB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU2126-1JB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1JB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU2126-1JB0-ZX95 thermal overload relay, Class 10, S0 frame, 690 V rated, for contactor mounting with integrated auxiliary switch and screw terminals.","salesMarkdown":"The Siemens 3RU2126-1JB0-ZX95 is a SIRIUS thermal overload relay — S0 frame size, Class 10 trip curve, rated 690 V. It's the part that sits between a contactor and the motor, watching current and tripping on overload before the winding insulation gives up. The thermal bimetallic release means it tracks the motor's heating curve naturally, no electronics to fail in a vibration-heavy panel. The auxiliary switch is integrated — no add-on block needed — and carries the 'Tripped' signal back to the PLC or indicator lamp. The S0 frame is the mid-size in the SIRIUS family; it handles motor power up to 7.5 kW at 690 V. The auxiliary contact ratings cover most control voltages you'll find in a panel: 2 A at 24 V and 230 V, 3 A at 120 V, 1 A at 400 V. Temperature compensation is active from -40 to +60 °C, so the trip point doesn't drift when the panel heats up in summer or the line runs near a furnace. Mounts directly to the contactor — no DIN rail bracket needed, no extra hardware. Accepts 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded wire per terminal. Screw terminals take a Pozidriv PZ2 bit, shaft diameter 5 to 6 mm. Main circuit connections use M4 screws. Mounting position is any, so you can lay it sideways in a shallow enclosure if needed. This is a current-production part in the SIRIUS portfolio. No end-of-life notice, no last-time-buy deadline — it's the standard thermal overload relay for S0 contactors and will be for the foreseeable future.","metaTitle":"Siemens 3RU2126-1JB0-ZX95 SIRIUS Thermal Overload Relay, Cla","metaDescription":"Siemens SIRIUS 3RU2126-1JB0-ZX95 thermal overload relay, Class 10, S0 frame, 690 V rated, for contactor mounting. Current production, sourced to order.","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":"4 kW","at 480 V rated value":"10 A","at 500 V rated value":"5.5 kW","at 600 V rated value":"10 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":"10 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":"10 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":"7 ... 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ff72ef6ceaf1c0e6fb674fc64d22ff0a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=166448&mlfb=3RU2126-1JB0-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2126-1JB0-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What does the 'Note for message Tripped' mean?","answer":"It means the integrated auxiliary switch changes state when the relay trips, sending a 'Tripped' signal — typically to a PLC input or a panel indicator. You don't need a separate auxiliary contact block."},{"question":"Does it drop into a panel designed for a 3RV1011-1HA10?","answer":"No — the 3RV1011 is a circuit breaker (motor protection switch), not a thermal overload relay. The 3RU2126 mounts to a contactor; the 3RV1011 is a standalone device with its own enclosure and switching mechanism. They serve different functions and have different footprints."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2126-1JB0-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/3RU2126-1JB0-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}}