{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4HB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4HB0","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4HB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4HB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, size S3, CLASS 10, IP20 front, ATEX certified, screw terminals, 140 mm depth.","salesMarkdown":"The Siemens 3RU1146-4HB0 is a SIRIUS thermal overload relay — size S3, CLASS 10 trip curve, designed to protect motors against overload and phase failure by monitoring current and heating a bimetal strip that trips the contactor coil. It mounts directly onto a contactor (fastening method: contactor mounting), saving DIN-rail space and keeping the power wiring short — common in motor control centers and panel builds where every millimeter of width counts. ## Trip class and coordination CLASS 10 means the relay must trip within 10 seconds at 7.2× the current setting — standard for standard-duty induction motors (pumps, fans, compressors) that don't need a slower CLASS 20 or 30 for high-inertia starts. Short-circuit coordination is specified: with type of assignment 2, use a gG fuse rated 125 A; with type of coordination 1, use a gG fuse rated 160 A — this tells the panel builder which upstream fuse to select so the relay survives a fault without damage (coordination 2) or with acceptable damage (coordination 1). Main circuit terminals are screw-type, accepting solid conductors from 10 to 50 mm² (2×) or stranded up to 70 mm² — sized for motor feeders up to roughly 55 kW at 400 V. Auxiliary and control circuit terminals are also screw-type, accepting solid wire 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²), and AWG equivalents 2× (20–16) or 2× (18–14). Relative humidity during operation can reach 100 % — suitable for condensing environments inside a sealed panel. ATEX certification (DMT 98 ATEX G 001) means the relay is approved for use in potentially explosive gas atmospheres when paired with an appropriate contactor and upstream protection.","metaTitle":"Siemens 3RU1146-4HB0 SIRIUS Thermal Overload Relay, CLASS 10","metaDescription":"Siemens SIRIUS 3RU1146-4HB0 thermal overload relay, CLASS 10 trip, IP20 front, ATEX certified, 140 mm depth. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"140 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"70 mm","Height":"120 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Per Pole":"5.1 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","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"screw-type 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: 160 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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","Touch Protection Against Electrical Shock":"finger-safe","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":"15.3 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"36 ... 50 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$116.59","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=504536&mlfb=3RU1146-4HB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4HB0/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RU1146-4HB0?","answer":"The depth is 140 mm, which is the dimension from the mounting surface to the furthest protruding point — important for enclosure depth planning."},{"question":"What wire sizes does the 3RU1146-4HB0 accept on the main circuit?","answer":"Solid conductors from 10 to 50 mm² (2×) or stranded up to 70 mm² — screw-type terminals, sized for motor feeders up to roughly 55 kW at 400 V."},{"question":"Where can I buy 3RU1146-4HB0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4HB0","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/3RU1146-4HB0 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}}