{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2146-4LD1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2146-4LD1","canonicalUrl":"https://aoctrl.com/siemens/3RU2146-4LD1","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2146-4LD1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, Size S3, 3RU2146-4LD1, CLASS 10, 77 A (480/600 V), 690 V rated insulation, screw terminals, integrated auxiliary switch.","salesMarkdown":"Siemens 3RU2146-4LD1 is a SIRIUS thermal overload relay, Size S3, with CLASS 10 trip protection. Rated at 77 A at both 480 V and 600 V, this relay covers motor full-load currents up to that threshold. Power dissipation is 7 W per pole — three poles at 21 W total, which matters for enclosure heat rise in a sealed panel with limited convection. The auxiliary switch is integrated, with contact ratings that vary by voltage: 2 A at 24 V and 230 V, 3 A at 120 V, 1 A at 400 V. These are the make/break capacities for the signal contact — the relay's own trip mechanism is bimetallic, not dependent on the auxiliary circuit. Stand-alone installation — no DIN rail adapter required, though it can also mount directly to a contactor. The M8 terminal bolts for the main circuit accept solid conductors from 2.5 to 16 mm² and stranded from 6 to 70 mm², covering motor leads from fractional-horsepower up to roughly 45 kW at 400 V. Any mounting position is allowed, simplifying panel layout. Temperature compensation operates from -40 to +60 °C, which means the trip curve stays within spec across the typical panel ambient range — important when the relay is near a hot contactor or in a non-climate-controlled enclosure. Lifecycle stage is marked as current production. This is not a phase-out or NRND part — it is the active SIRIUS S3 overload relay from Siemens. No official successor exists because the part is still the current design. Substance prohibitance date of 03/01/2017 aligns with RoHS and REACH compliance timelines. The relay is manufactured for global markets; no specific UL/CSA listing is in the evidence, but the 690 V rated insulation and AC-3e rating up to 1000 V are consistent with IEC 60947-4-1 design.","metaTitle":"Siemens 3RU2146-4LD1 SIRIUS Thermal Overload Relay, CLASS 10","metaDescription":"Siemens 3RU2146-4LD1 SIRIUS thermal overload relay, Size S3, CLASS 10 trip, 77 A at 480/600 V, 690 V insulation. Current production. Available to order, RFQ for pricing.","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","title":"3RU2146-4LD1","Height":"120 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"7 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","description":"Overload relay 70...90 A Thermal For motor protection Size S3, Class 10 Stand-alone installation Main circuit: Screw Auxiliary circuit: spring-type terminal Manual-Automatic-Reset","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":"45 kW","at 480 V rated value":"77 A","at 500 V rated value":"55 kW","at 600 V rated value":"77 A","at 690 V rated value":"75 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":"90 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":"90 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":"21 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"70 ... 90 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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/59c74d41332222f9ea2e5d974a951880.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=630114&mlfb=3RU2146-4LD1"},"ai":{"faq":[{"question":"What does the Note for message Tripped mean on 3RU2146-4LD1?","answer":"The relay carries a \"Note for message Tripped\" — this is a diagnostic label for the auxiliary contact circuit. When the bimetallic strip trips, the integrated auxiliary switch changes state, and this note indicates the signal can be wired to a PLC or HMI input to display a \"Tripped\" alarm message."},{"question":"What is the depth of 3RU2146-4LD1?","answer":"Depth is 140 mm, with a width of 70 mm and height of 120 mm. The 140 mm depth is the dimension from the mounting surface to the farthest protruding point — typically the auxiliary switch housing."},{"question":"Will 3RU2146-4LD1 drop into a panel specified for 3RU2116-1FC1?","answer":"No, not without rewiring. 3RU2146-4LD1 is a Size S3 relay; 3RU2116-1FC1 is a Size S0. The S3 has a larger footprint, different terminal centers, and heavier conductor capacity. The panel would need new mounting holes and terminal wiring adjustments."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2146-4LD1","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/3RU2146-4LD1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}