{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4JB0-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4JB0-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4JB0-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4JB0-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RU1146-4JB0-ZX95 thermal overload relay, CLASS 10, Size S3, screw terminals, 140 mm depth, ATEX certified.","salesMarkdown":"It is a CLASS 10 device, meaning it trips within 10 seconds at 7.2× the current setting, which is the standard for standard-capability motors that don't need the faster CLASS 5 or the slower CLASS 20. This is a Size S3 unit, the mid-range frame in the SIRIUS family, sized for motor loads that fit the S3 contactor footprint. The trip class is the headline rating here: CLASS 10 means it clears a locked-rotor condition fast enough to protect the motor winding but not so fast that it nuisance-trips on normal starting inrush. For a pump or fan with a moderate start time, this is the right call. The relay carries a surge voltage resistance of 8 kV, which tells you the insulation coordination is built for industrial mains with transient activity — no external surge suppressor needed for the relay itself. This relay mounts directly onto the contactor — the evidence lists \"contactor mounting\" as the fastening method. No DIN rail bracket is involved; it clips onto the S3 contactor's body and connects through the main power terminals. That means it can be oriented to fit tight panel layouts without derating, as long as the vertical surface requirement is met. Depth is 140 mm, width 70 mm, height 120 mm — the depth is the dimension that extends forward from the contactor face, so plan for that clearance in the enclosure depth. Main circuit terminals are screw-type, accepting stranded conductors from 10 to 70 mm² or 2x (10 to 50 mm²). For AWG, that translates to 2x (10 to 1/0) or 1x (10 to 2/0). Auxiliary and control circuit terminals are also screw-type, accepting solid conductors 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²), or AWG 2x (20 to 16) and 2x (18 to 14). The solid conductor range is what a VMI coordinator or panel builder needs to confirm for the control wiring gauge already in the panel — if the existing control wires are 1.5 mm² solid, they fit; if they are 4 mm², they don't. ## Protection and compliance The relay holds ATEX certification DMT 98 ATEX G 001, which qualifies it for use in potentially explosive gas atmospheres when paired with the correct contactor and upstream protection. For fuse coordination, with type of coordination 2 required the upstream gG fuse is 125 A; with type of coordination 1 required it is 200 A. That is the fuse size the panel designer needs to spec upstream to guarantee the relay clears a fault without damage to itself. Shock resistance is 8g for 10 ms — sufficient for normal industrial vibration but not for high-impact applications like forging presses.","metaTitle":"Siemens 3RU1146-4JB0-ZX95 SIRIUS thermal overload relay, CLA","metaDescription":"Siemens 3RU1146-4JB0-ZX95 SIRIUS thermal overload relay, CLASS 10 trip, S3 size, 140 mm depth, 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":"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=29867&mlfb=3RU1146-4JB0-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4JB0-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RU1146-4JB0-ZX95 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the depth of 3RU1146-4JB0-ZX95?","answer":"The depth is 140 mm, which is the dimension extending forward from the contactor face when mounted."},{"question":"What solid conductor sizes does the auxiliary terminal accept?","answer":"The auxiliary screw terminals accept solid conductors 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²)."},{"question":"What ATEX certification does this relay carry?","answer":"It holds DMT 98 ATEX G 001 certification, qualifying it for use in potentially explosive gas atmospheres when paired with the correct contactor and upstream protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4JB0-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/3RU1146-4JB0-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}}