{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4JD0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4JD0","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4JD0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4JD0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU1146-4JD0 thermal overload relay, Class 10, S3 size, contactor mounting, screw-type main terminals, Cage Clamp auxiliary, IP20 front, ATEX approved.","salesMarkdown":"## SIRIUS 3RU1146-4JD0 — Thermal Overload Relay, Class 10, S3 Size The Siemens SIRIUS 3RU1146-4JD0 is a thermal overload relay in the S3 size, designed for contactor mounting and motor protection with a Trip Class 10 characteristic — meaning it will trip within 10 seconds at 7.2× the set current, fast enough to protect standard induction motors from locked-rotor heating without nuisance tripping on normal starts. Class 10 trip class is the standard for general-purpose motor starting — it handles the inrush of a 4-pole induction motor starting unloaded (like a pump or fan) but may trip on high-inertia loads like a centrifuge or flywheel, which would need Class 20 or 30. The S3 frame size indicates the physical envelope: 140 mm depth, 70 mm width, 120 mm height, with zero clearance required upwards, forwards, backwards, and downwards, and only 6 mm clearance at the sides — so it can be packed tight in a panel without derating for airflow. The relay mounts directly onto the contactor (fastening method: contactor mounting), which means no separate DIN-rail footprint — it piggybacks on the contactor's own mounting, saving rail space. Main circuit terminals are screw-type, accepting solid 2x (0.5... 2.5 mm²) or stranded 2x (10... 50 mm²), and up to 10... 70 mm² single stranded. Auxiliary and control circuit terminals use Cage Clamp (spring-cage) for faster wiring — 2x (0.5... 2.5 mm²) solid, 2x (20... 14) AWG. The substance prohibitance date of 07/01/2006 aligns with RoHS compliance for the European market. The built-in auxiliary contacts are rated for switching at multiple control voltages: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, and 1 A at 400 V AC. At 110 V and 125 V the rating is 0.22 A, and at 220 V it is 0.11 A. These cover typical PLC input and contactor coil loads across common control voltages. This is not a last-time-buy or obsolete line — no successor part number exists because it remains in the active catalog.","metaTitle":"Siemens 3RU1146-4JD0 SIRIUS Thermal Overload Relay, Class 10","metaDescription":"Siemens SIRIUS 3RU1146-4JD0 thermal overload relay, Class 10, S3 size, IP20 front, ATEX approved, 8 kV surge. Current lifecycle. Sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Solid":"2x (0.5 ... 2.5 mm²)","Width":"70 mm","Height":"120 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Per Pole":"5.7 W","Stranded":"2x (10 ... 50 mm²), 10 ... 70 mm²","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","Backwards":"0 mm","Downwards":"0 mm","Trip Class":"CLASS 10","At The Side":"6 mm","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Contactor mounting","Shock Resistance":"8g / 10 ms","Mounting Position":"with vertical mounting surface +/-135° rotatable, with vertical mounting surface +/- 45° tiltable to the front and back","Product Brand Name":"SIRIUS","Type Of Protection":"DMT 98 ATEX G 001","Product Designation":"thermal overload relay","Size Of Overload Relay":"S3","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"07/01/2006","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"Cage Clamp terminals","Relative Humidity During Operation":"100 %","With Type Of Assignment 2 Required":"gG: 125 A","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 200 A","at AWG cables for auxiliary contacts":"2x (20 ... 14)","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Touch Protection Against Electrical Shock":"finger-safe","Finely Stranded Without Core End Processing":"2x (0.5 ... 1.5 mm²)","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Size Of Contactor Can Be Combined Company-Specific":"S3","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A, quick: 10 A","insulation voltage with degree of pollution 3 at AC rated value":"1 000 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":"17.1 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"45 ... 63 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$72.01","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=497327&mlfb=3RU1146-4JD0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4JD0/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class of the 3RU1146-4JD0?","answer":"Trip Class 10, meaning it will trip within 10 seconds at 7.2× the current setting. This is suitable for standard induction motor starting but may not handle high-inertia loads that require Class 20 or 30."},{"question":"What are the mounting clearances for this relay?","answer":"Zero clearance required upwards, forwards, backwards, and downwards. Only 6 mm clearance is needed at the sides. The relay mounts directly onto the contactor, not on a DIN rail."},{"question":"Does the 3RU1146-4JD0 have ATEX approval?","answer":"Yes, it carries ATEX certification DMT 98 ATEX G 001, qualifying it for use in potentially explosive atmospheres."},{"question":"Where can I buy the 3RU1146-4JD0 and what is the lead time?","answer":"The part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock or lead-time figures are published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4JD0","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/3RU1146-4JD0 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}}