{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4JB1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4JB1","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4JB1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4JB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU1146-4JB1 thermal overload relay, size S3, screw-type terminals, Class 10 trip, 125 A gG coordination, ATEX certified, IP20 front protection.","salesMarkdown":"## Thermal overload relay for motor protection circuits Rated for a gG fuse coordination of 125 A (type of assignment 2) and 200 A (type of coordination 1), this relay integrates into a selective coordination scheme: the 125 A limit ensures the upstream fuse clears before the relay is damaged under a short circuit, preserving the downstream motor branch. For compliance documentation, the part carries a substance prohibition date of July 1, 2006, aligning with the original EU RoHS directive. The ATEX approval (DMT 98 ATEX G 001) confirms suitability for explosive gas atmospheres — a documented certification that supports the validation engineer's requirement for traceable hazardous-area compliance. ## Integration and mounting flexibility Mounting position is specified with a vertical mounting surface, rotatable ±135° and tiltable ±45° to front and back — enough range to fit into tight enclosure layouts or angled backplanes. Clearance requirements are tight: 0 mm upwards, forwards, backwards, and downwards, with only 6 mm needed at the side. That zero-clearance stack allows the relay to be installed directly against adjacent components or enclosure walls without derating. Dimensions are 120 mm high, 70 mm wide, and 140 mm deep — a compact S3 footprint that fits standard DIN-rail or screw-mount panels without requiring oversized gland plates. Relative humidity during operation is 100 %, so condensation-prone environments (washdown zones, cold rooms) are within specification as long as the IP20 front is inside a sealed enclosure. ## Electrical ratings and surge withstand Shock resistance is tested at 8g for 10 ms, covering most vibration environments short of direct hammer-drill mounting. Auxiliary contact ratings are specified 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 — covering both low-voltage DC and standard AC control circuits. The 0.22 A at 110 V and 125 V, and 0.11 A at 220 V, provide additional granularity for legacy control voltages. Power dissipation per pole is 5.7 W. For a three-pole relay, total heat load is approximately 17.1 W — a figure the panel designer must include in the enclosure thermal budget to avoid cumulative derating.","metaTitle":"Siemens 3RU1146-4JB1 SIRIUS thermal overload relay, S3, Clas","metaDescription":"Siemens 3RU1146-4JB1 SIRIUS thermal overload relay, size S3, screw terminals, Class 10 trip, 125 A gG coordination, ATEX, IP20 front. Current production, sourced to order.","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":"5.7 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":"stand-alone installation","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":"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: 200 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":"17.1 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"45 ... 63 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=470890&mlfb=3RU1146-4JB1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4JB1/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does the 3RU1146-4JB1 carry?","answer":"It carries RoHS compliance (substance prohibition date July 1, 2006) and ATEX certification DMT 98 ATEX G 001 for explosive gas atmospheres. The SIRIUS series typically provides UL, CSA, and CE declarations on request, though those specific marks are not listed in this record."},{"question":"What is the depth of the 3RU1146-4JB1?","answer":"The depth is 140 mm, with zero clearance required forwards, backwards, upwards, or downwards. Side clearance is 6 mm."},{"question":"What wire sizes does the 3RU1146-4JB1 accept on the main terminals?","answer":"Screw-type main terminals accept solid wire: 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²). Stranded wire: 2x (10... 50 mm²) and 10... 70 mm². AWG equivalents: 2x (10... 1/0) and 1x (10... 2/0)."},{"question":"Will the 3RU1146-4JB1 drop into a panel designed for the 3RT1044-1FB46 contactor?","answer":"The 3RU1146-4JB1 is a thermal overload relay designed for direct mounting to a matching SIRIUS contactor of the same size (S3). The 3RT1044-1FB46 is a contactor of a different frame size (S0/S2), so direct mechanical stacking is not possible without an adapter. The wiring footprint and terminal positions differ; a panel re-layout would be required."},{"question":"What is the trip class of the 3RU1146-4JB1?","answer":"It is Class 10, meaning it will trip within 10 seconds at 7.2× the rated current. This is standard for protecting standard induction motors against locked-rotor conditions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4JB1","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/3RU1146-4JB1 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}}