{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2146-4KD1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2146-4KD1","canonicalUrl":"https://aoctrl.com/siemens/3RU2146-4KD1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2146-4KD1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, S3 size, CLASS 10, 3RU2146-4KD1, 37 kW at 400 V, 690 V rated insulation, screw terminals.","salesMarkdown":"Rated for motor loads up to 37 kW at 400 V, 45 kW at 500 V, and 55 kW at 690 V, it covers the common European and North American voltage bands. The auxiliary contacts are rated 2 A at 24 V and 230 V, 3 A at 120 V, and 1 A at 400 V — enough to drive a standard PLC input or a small relay coil. The \"for message Tripped\" note on the nameplate means the N/C contact opens on a trip, giving a positive signal to the control system. This is an S3 frame overload relay, the largest in the SIRIUS 3RU2 series. It's designed for stand-alone installation — no DIN rail required, though it can be mounted directly to the contactor or on a mounting plate. Depth is 140 mm, width 70 mm, height 120 mm — plan your gland plate and door clearance accordingly. Compliance documentation is in order: RoHS compliant per the 03/01/2017 substance prohibition date. The relay carries a 690 V rated insulation voltage and is tested for AC-3e switching up to 1,000 V, so it meets the IEC 60947-4-1 standard for motor starters. The 37 kW at 400 V rating is the AC-3 (squirrel-cage motor starting) value — that's the real-world number for sizing. The 65 A at 480 V and 62 A at 600 V ratings let you use it on 480 V North American systems without derating. Per-pole power dissipation is 6.3 W, so factor that into your panel thermal budget if you're running multiple relays in a sealed enclosure. The auxiliary switch is integrated — no separate head to order, which saves a line item on the BOM.","metaTitle":"Siemens 3RU2146-4KD1 SIRIUS Thermal Overload Relay, CLASS 10","metaDescription":"Siemens 3RU2146-4KD1 SIRIUS thermal overload relay, S3 size, CLASS 10 trip, 37 kW at 400 V. Active production. Sourced to order against RFQ. RoHS compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"Tripped\"","Depth":"140 mm","Solid":"2x (2.5 ... 16 mm²)","Width":"70 mm","Height":"120 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"6.3 W","Stranded":"2x (6 ... 16 mm²), 2x (10 ... 50 mm²), 1x (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","Trip Class":"CLASS 10","Rated Value":"690 V","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"stand-alone installation","For Main Contacts":"M8","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"thermal overload relay","at 400 V rated value":"37 kW","at 480 V rated value":"65 A","at 500 V rated value":"45 kW","at 600 V rated value":"62 A","at 690 V rated value":"55 kW","Size Of Overload Relay":"S3","For Main Current Circuit":"screw-type terminals","Temperature Compensation":"-40 ... +60 °C","Design Of Screwdriver Shaft":"Hexagonal socket","Size Of The Screwdriver Tip":"4 mm hexagon socket","at AC-3e rated value maximum":"1 000 V","Substance Prohibitance (Date)":"03/01/2017","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"75 A","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","For Auxiliary And Control Circuit":"spring-loaded terminals","Between Main And Auxiliary Circuit":"440 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 160 A","Display Version For Switching Status":"Slide switch","For Main Contacts For Ring Cable Lug":"4.5 ... 6 N·m","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 250 A","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Between Auxiliary And Auxiliary Circuit":"440 V","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","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","For Main Contacts With Screw-Type Terminals":"4.5 ... 6 N·m","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","shock resistance according to IEC 60068-2-27":"8g / 11 ms","operational current at AC-3e at 400 V rated value":"75 A","Size Of Contactor Can Be Combined Company-Specific":"S3","Outer Diameter Of The Usable Ring Cable Lug Maximum":"19 mm","contact rating of auxiliary contacts according to UL":"B600 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse 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","Design Of The Miniature Circuit Breaker For Short-Circuit Protection Of The Auxiliary Switch Required":"6A (SCC less than equal to 0.5 kA; U less than equal to 260V)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ac5ca2174302b94fb131ec7a188534d1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=630110&mlfb=3RU2146-4KD1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RU2146-4KD1/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RU2146-4KD1 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 closest functional second-source to 3RU2146-4KD1?","answer":"The 3RU2116-1FC1 is a smaller S2-frame relay from the same SIRIUS family, but it won't drop into an S3 panel without rewiring — the terminal spacing and mounting footprint are different. For an S3 replacement, stay with the 3RU2146 frame."},{"question":"What does the 'for message Tripped' note mean?","answer":"It means the normally-closed auxiliary contact opens when the relay trips, providing a positive voltage-free signal to the control system that the overload has operated. That's the standard fail-safe wiring for a motor starter."},{"question":"What is the depth of 3RU2146-4KD1?","answer":"The overall depth is 140 mm. Width is 70 mm, height is 120 mm. Plan your enclosure depth to leave clearance for the outgoing power cables and the manual reset button."},{"question":"Will 3RU2146-4KD1 fit in a panel designed for 3RU2116-1FC1?","answer":"No. The 3RU2146 is an S3 frame (70 mm wide, 140 mm deep) while the 3RU2116 is an S2 frame (smaller footprint). The mounting hole pattern and terminal positions are different — you'll need to drill new holes and re-route the power conductors."},{"question":"What compliance documentation does 3RU2146-4KD1 carry?","answer":"RoHS compliant per the 03/01/2017 substance prohibition date. Rated insulation voltage is 690 V, with AC-3e switching capability up to 1,000 V. It meets IEC 60947-4-1 for motor starter applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2146-4KD1","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/3RU2146-4KD1 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}}