{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4LB0-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4LB0-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4LB0-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4LB0-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU1146-4LB0-ZW97, CLASS 10, Size S3, screw terminals, ATEX, IP20 front, 140 mm depth.","salesMarkdown":"The IP20 front face keeps live terminals behind the enclosure door; the relay itself sits inside the panel, not in the washdown zone. CLASS 10 is the most common trip class for general-purpose motor starting — it gives the motor time to accelerate under load without nuisance tripping, but still clears a locked-rotor condition fast enough to avoid winding damage. The relay is coordinated with upstream fuses: Type 2 coordination requires a gG 160 A fuse; Type 1 coordination allows a gG 250 A fuse. That distinction matters for panel builders who need to limit downstream damage after a fault — Type 2 leaves the relay usable after a short circuit, Type 1 may require replacement. That means it can be packed close to adjacent components without derating, as long as side clearance is respected. Main circuit terminals accept stranded conductors from 10 to 70 mm² (or 2x 10 to 50 mm²), and AWG 10 to 1/0 (2x) or 10 to 2/0 (single). Auxiliary and control circuit terminals take 0.5 to 1.5 mm² (2x) or 0.75 to 2.5 mm² (2x), with AWG equivalents 20-16 (2x) and 18-14 (2x). All terminals are screw-type — no spring-cage option on this variant. 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, 1 A at 400 V, and lower ratings at 110 V (0.22 A), 125 V (0.22 A), and 220 V (0.11 A). These cover most PLC input and contactor coil circuits in common control voltages. The 3 A at 120 V rating is the highest — useful for North American control schemes.","metaTitle":"Siemens 3RU1146-4LB0-ZW97 SIRIUS Thermal Overload Relay, CLA","metaDescription":"Siemens SIRIUS 3RU1146-4LB0-ZW97 thermal overload relay, CLASS 10 trip, S3 frame, ATEX certified, IP20 front. Active production. Sourced to order. Request quote for pricing and ava","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: 160 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":"70 ... 90 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=153316&mlfb=3RU1146-4LB0-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4LB0-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class of this overload relay?","answer":"CLASS 10 — it trips within 10 seconds at 7.2× the set current, suitable for standard induction motor starting."},{"question":"What certifications does 3RU1146-4LB0-ZW97 carry?","answer":"ATEX certification DMT 98 ATEX G 001 for explosive atmospheres, plus RoHS compliance (substance prohibition date 07/01/2006)."},{"question":"How do I get pricing and availability for 3RU1146-4LB0-ZW97?","answer":"Submit an RFQ — pricing and lead time are confirmed at quote time through independent distribution channels."},{"question":"What wire sizes does the main circuit accept?","answer":"Stranded: 10 to 70 mm² single or 2x 10 to 50 mm². AWG: 10 to 2/0 single or 2x 10 to 1/0."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4LB0-ZW97","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/3RU1146-4LB0-ZW97 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}}