{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4MB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4MB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4MB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4MB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU1146-4MB0-ZX95 thermal overload relay, CLASS 10 trip class, Size S3, 140 mm depth, screw-type terminals, IP20 front, ATEX certified.","salesMarkdown":"The Siemens 3RU1146-4MB0-ZX95 is a SIRIUS-brand thermal overload relay, Size S3, designed for contactor mounting — it fastens directly to the matching SIRIUS contactor without separate DIN-rail hardware, saving panel width and simplifying the BOM. Rated for motor protection in ATEX-classified atmospheres (DMT 98 ATEX G 001), so it supports Ex e and Ex d installations where the overload relay must be part of the certified protection chain. Depth of 140 mm, width 70 mm, height 120 mm — the S3 envelope is the largest in the SIRIUS relay range, sized for main-circuit conductors up to 2x (10... 50 mm²) stranded or 10... 70 mm² single stranded. Clearance requirements: zero mm upwards, forwards, backwards, and downwards; only 6 mm at the side. That means the relay can be stacked tight against adjacent devices — no extra breathing gap needed for heat dissipation, though the 7 W per pole dissipation should be considered in sealed enclosures. Auxiliary contact ratings: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V — these are the switching capacities for the N/O and N/C signal contacts feeding the PLC or safety circuit. The 24 V figure (1 A) is the one to check for 24 VDC control loops. Auxiliary terminals accept 2x (0.5... 1.5 mm²) solid or 2x (0.75... 2.5 mm²) stranded. Shock rated at 8g / 10 ms, operating temperature range -20 to +70 °C, and 100 % relative humidity during operation — suitable for unconditioned industrial floors and washdown-adjacent zones, provided the panel maintains IP20. Substance prohibitance date of 07/01/2006 aligns with RoHS transition timelines; the relay is compliant with the RoHS directive as implemented by Siemens. ## Coordination and selectivity For type of coordination 1 (no damage to the overload relay under short circuit), a gG fuse rated up to 250 A is required upstream. For type of coordination 2 (the relay remains functional after clearing the fault), the gG fuse must be limited to 200 A. Surge voltage resistance rated at 8 kV.","metaTitle":"Siemens 3RU1146-4MB0-ZX95 SIRIUS thermal overload relay, CLA","metaDescription":"Siemens SIRIUS 3RU1146-4MB0-ZX95 thermal overload relay, CLASS 10 trip, S3 size, 140 mm depth, IP20 front, ATEX certified. 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":"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":"screw-type terminals","Relative Humidity During Operation":"100 %","With Type Of Assignment 2 Required":"gG: 200 A","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 250 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":"21 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"80 ... 100 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=335414&mlfb=3RU1146-4MB0-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4MB0-ZX95/alternatives.json"},"ai":{"faq":[{"question":"What clearance is needed around the relay?","answer":"Zero mm upwards, forwards, backwards, and downwards; 6 mm at the side. It can be mounted flush against adjacent devices in a panel."},{"question":"What conductor sizes does the main circuit accept?","answer":"Stranded: 2x (10... 50 mm²) or single 10... 70 mm². AWG: 2x (10... 1/0) or single 10... 2/0. Auxiliary terminals accept 2x (0.5... 1.5 mm²) solid or 2x (0.75... 2.5 mm²) stranded."},{"question":"Is this relay ATEX certified?","answer":"Yes, it carries ATEX certification DMT 98 ATEX G 001, suitable for motor protection in explosive atmospheres."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4MB0-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/3RU1146-4MB0-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}}