{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU1146-4KD1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU1146-4KD1","canonicalUrl":"https://aoctrl.com/siemens/3RU1146-4KD1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4KD1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, 3RU1146-4KD1, Size S3, CLASS 10, screw-type main terminals, Cage Clamp aux terminals, IP20 front, ATEX certified.","salesMarkdown":"The IP20 front protection keeps live parts behind the panel door; the relay itself is rated for stand-alone installation on a vertical mounting surface, rotatable ±135° and tiltable ±45° front-to-back, giving panel builders flexibility in tight enclosures. The main circuit uses screw-type terminals accepting stranded wire from 10 to 70 mm² (2x 10–50 mm²). For auxiliary and control circuits, Cage Clamp terminals accept 2x (0.5–2.5 mm²) solid or 2x (20–14 AWG). The auxiliary contact ratings are given per voltage: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V — these are the maximum switching currents for the built-in N/O and N/C contacts, so check your control voltage before committing the BOM line. Short-circuit coordination is specified for two scenarios: with type of assignment 2 (no damage to the relay after a fault), a gG fuse rated 160 A is required; with type of coordination 1 (relay may need replacement after fault), a 250 A gG fuse is permitted. This matters for selectivity studies — the 160 A limit under assignment 2 is the tighter constraint for upstream breaker sizing. Power dissipation per pole is 6.3 W, so three poles dissipate about 19 W inside the enclosure. Factor that into your thermal budget, especially if the relay is grouped with other heat sources in a sealed cabinet. Surge voltage resistance is rated at 8 kV, and shock resistance at 8g for 10 ms — the relay can handle typical industrial electrical transients and mechanical vibration from contactors or motor starts without nuisance tripping. Storage and transport range extends to -55 to +80 °C. The ATEX certification (DMT 98 ATEX G 001) allows use in potentially explosive gas atmospheres — check the specific zone and gas group against your installation. The relay measures 70 mm wide, 120 mm high, and 140 mm deep. This means it can be mounted flush against adjacent devices on three sides, with only a 6 mm side gap needed — useful for dense DIN-rail or backplate layouts.","metaTitle":"Siemens 3RU1146-4KD1 SIRIUS Thermal Overload Relay, CLASS 10","metaDescription":"Siemens 3RU1146-4KD1 SIRIUS thermal overload relay, CLASS 10, Size S3, screw terminals, IP20 front, ATEX, 140 mm depth. Current production. Quoted 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 ... 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":"stand-alone installation","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":"Cage Clamp 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 ... 14)","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Touch Protection Against Electrical Shock":"finger-safe","Finely Stranded Without Core End Processing":"2x (0.5 ... 1.5 mm²)","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=30619&mlfb=3RU1146-4KD1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU1146-4KD1/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RU1146-4KD1?","answer":"The 3RU1146-4KD1 is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does this brand provide for 3RU1146-4KD1?","answer":"The relay carries ATEX certification (DMT 98 ATEX G 001) for explosive gas atmospheres, and the substance prohibition date of 07/01/2006 aligns with RoHS compliance. The reference code per IEC 81346-2 is F (protective device)."},{"question":"What are the key dimensions and clearances for 3RU1146-4KD1?","answer":"Width is 70 mm, height 120 mm, depth 140 mm. Clearances: 0 mm upwards, forwards, backwards, and downwards; 6 mm at the side."},{"question":"What wire sizes does the 3RU1146-4KD1 accept?","answer":"Main circuit screw terminals accept stranded wire 10–70 mm² (2x 10–50 mm²). Auxiliary Cage Clamp terminals accept 2x (0.5–2.5 mm²) solid or 2x (20–14 AWG)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU1146-4KD1","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/3RU1146-4KD1 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}}