{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4JB0-ZW95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4JB0-ZW95","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4JB0-ZW95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4JB0-ZW95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 thermal overload relay, 3RU1146-4JB0-ZW95, CLASS 10 trip, ATEX certified, IP20 front, screw terminals, 140 mm depth.","salesMarkdown":"The Siemens 3RU1146-4JB0-ZW95 is a SIRIUS S3 thermal overload relay — the component that sits between a contactor and the motor, monitoring current and tripping on sustained overload before the winding temperature rises past the insulation class. Fastening method is contactor mounting — it snaps directly onto the matching SIRIUS contactor, no DIN rail required for the relay itself. Mounting position allows a vertical mounting surface with ±135° rotation and ±45° tilt forward/backward, so the panel layout can angle the relay for access without derating. That zero-clearance stack means you can gang contactor-relay pairs side by side without extra spacing, saving rail real estate. Main circuit uses screw-type terminals accepting stranded 2x (10 … 50 mm²) or 10 … 70 mm², and solid 2x (0.5 … 1.5 mm²) or 2x (0.75 … 2.5 mm²). AWG equivalents for main contacts: 2x (10 … 1/0) or 1x (10 … 2/0). Auxiliary and control circuit also screw-type, accepting AWG 2x (20 … 16) or 2x (18 … 14). That range covers panel wire from control-circuit 1.5 mm² up to motor-circuit 70 mm² — no need for terminal reducers on the larger feeds. ## Environmental and protection Protection class on the front is IP20 — finger-safe but not sealed; install inside a cabinet rated for the environment. Operating temperature range -20 … +70 °C, storage and transport -55 … +80 °C. Relative humidity during operation up to 100 %, so condensation-prone enclosures are acceptable as long as the IP20 front is not directly exposed. Shock resistance 8g / 10 ms, surge voltage resistance rated 8 kV. ATEX certification DMT 98 ATEX G 001 covers use in potentially explosive gas atmospheres when paired with the appropriate contactor and upstream protection. For type of coordination 2 (no damage to the relay under short-circuit conditions), the required upstream fuse is gG: 125 A. For type of coordination 1 (relay may be damaged but no hazard), gG: 200 A. 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 signal circuit back to the PLC or control relay.","metaTitle":"Siemens 3RU1146-4JB0-ZW95 SIRIUS thermal overload relay, S3,","metaDescription":"Siemens 3RU1146-4JB0-ZW95 SIRIUS S3 thermal overload relay, CLASS 10 trip, ATEX certified, IP20 front. 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":"5.7 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: 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=421741&mlfb=3RU1146-4JB0-ZW95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4JB0-ZW95/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RU1146-4JB0-ZW95?","answer":"Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels."},{"question":"What compliance documentation does this relay carry?","answer":"ATEX certification DMT 98 ATEX G 001 for gas atmospheres, RoHS compliance per substance prohibition date 07/01/2006, and IP20 front protection. The SIRIUS series carries UL/CSA/CE/IEC approvals as standard."},{"question":"What are the key ratings for 3RU1146-4JB0-ZW95?","answer":"CLASS 10 trip, S3 frame size, 5.7 W power loss per pole, operating temperature -20 to +70 °C, shock resistance 8g/10 ms, surge voltage 8 kV, and auxiliary contact ratings from 1 A at 24 V up to 3 A at 120 V."},{"question":"Will 3RU1146-4JB0-ZW95 drop into a panel specified around 3RT5044-1BM40?","answer":"The 3RU1146-4JB0-ZW95 is a thermal overload relay designed to mount directly on SIRIUS contactors. The 3RT5044-1BM40 is a contactor in the same SIRIUS family, so the relay snaps onto it without rewiring — same S3 frame interface."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4JB0-ZW95","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/3RU1146-4JB0-ZW95 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}}