{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4KB0-ZW98","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4KB0-ZW98","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4KB0-ZW98","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4KB0-ZW98","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU1146-4KB0-ZW98 thermal overload relay, CLASS 10, Size S3, 140 mm depth, contactor mounting, screw terminals, ATEX.","salesMarkdown":"It protects motors against overload and phase failure by monitoring current through the main circuit and tripping the contactor via its auxiliary contacts. This zero-clearance design lets you pack relays tightly in a row without derating, which matters when you're fitting multiple motor starters into a single enclosure. The auxiliary contact ratings cover the control voltage range you'll find in most panels: 3 A at 120 V, 2 A at 230 V, 1 A at 400 V. At 24 V the contact is rated 1 A. These are the switching capacities for the N/C and N/O contacts that signal the contactor coil and the PLC input — verify your control transformer and input card can supply the minimum load to keep the contacts clean. Power dissipation per pole is 6.3 W. For a three-pole relay that's 18.9 W total heat to manage inside the enclosure. If you're grouping multiple starters in a sealed cabinet, factor this into your thermal calculation to avoid exceeding the 70 °C operating limit. Surge voltage resistance rated at 8 kV and shock resistance 8g / 10 ms — the relay is built for industrial environments with transient-heavy supplies and vibration from contactors and motor starting. Fastening method is contactor mounting — the relay clips directly onto the matching SIRIUS contactor, no DIN rail required. The mounting position allows a vertical mounting surface with +/-135° rotation and +/-45° tilt to the front and back, giving flexibility in panel layout. Main circuit terminals accept stranded wire 2x (10... 50 mm²) or 10... 70 mm²; auxiliary and control circuit terminals accept solid 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), or AWG 2x (20... 16) and 2x (18... 14). All terminals are screw-type. The relay carries ATEX protection type DMT 98 ATEX G 001, certifying it for use in potentially explosive atmospheres — relevant for chemical, pharmaceutical, or grain-handling installations where motor starters must not become ignition sources. Protection class on the front is IP20. Substance prohibition date per RoHS/REACH is 07/01/2006.","metaTitle":"Siemens 3RU1146-4KB0-ZW98 SIRIUS Thermal Overload Relay, CLA","metaDescription":"Siemens SIRIUS 3RU1146-4KB0-ZW98 thermal overload relay, CLASS 10 trip, S3 size, 140 mm depth, contactor mounting. ATEX approved. 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":"6.3 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: 160 A","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 250 A","for 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":"18.9 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"57 ... 75 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=534351&mlfb=3RU1146-4KB0-ZW98","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4KB0-ZW98/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class of this overload relay?","answer":"CLASS 10, meaning it trips within 10 seconds at 7.2× the set current, matching standard induction motor protection requirements."},{"question":"What are the mounting clearances for 3RU1146-4KB0-ZW98?","answer":"Zero clearance required upwards, forwards, and backwards; 6 mm clearance needed at the sides. The relay mounts directly on the contactor."},{"question":"Where can I buy 3RU1146-4KB0-ZW98 and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time."},{"question":"What compliance documentation does this relay carry?","answer":"ATEX approval DMT 98 ATEX G 001, IP20 front protection, RoHS/REACH substance prohibition date 07/01/2006, and IEC 81346-2 reference code F."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4KB0-ZW98","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/3RU1146-4KB0-ZW98 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}}