{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RU2146-4FB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RU2146-4FB0","canonicalUrl":"https://aoctrl.com/siemens/3RU2146-4FB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RU2146-4FB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS thermal overload relay, size S3, CLASS 10, screw terminals, 3RU2146-4FB0, 18.5 kW at 400 V, 40 A at 480 V.","salesMarkdown":"## SIRIUS 3RU2146-4FB0 — thermal overload relay, S3 frame, CLASS 10 Rated for 18.5 kW at 400 V (AC-3e) and 40 A at 480 V, this relay covers a solid mid-range motor band. The 690 V rated insulation voltage means it's suitable for 400 V and 480 V line supplies with headroom, but not for 690 V line-to-line systems — the 37 kW at 690 V figure applies only when the relay's contacts are switching that voltage level, not the motor's line supply. Mounts directly onto a contactor (fastening method: contactor mounting,) in any position. The screw-type main terminals accept solid 2× (2.5…16 mm²) or stranded up to 1× 70 mm², which covers common motor cable sizes for this frame. Integrated auxiliary switch provides the tripped signal — the relay carries a note \"for message 'Tripped'\", meaning the auxiliary contact changes state on overload, not on manual test or reset. RoHS compliance date is noted as 03/01/2017, confirming the part meets the EU RoHS substance restrictions effective from that date. The relay also carries the SIRIUS brand's standard CE marking for the European market. These figures make it suitable for unheated enclosure installations in temperate climates, but not for extended exposure above 70 °C ambient. The 4 mm hexagon socket screwdriver shaft is required for the screw terminals. Depth of 125 mm, width 70 mm, height 105 mm — fits standard S3 contactor footprints. Panel builders should note the M8 main contact screw size when selecting lug rings for motor cables.","metaTitle":"Siemens 3RU2146-4FB0 SIRIUS Thermal Overload Relay, S3, Clas","metaDescription":"Siemens SIRIUS 3RU2146-4FB0 thermal overload relay, S3 size, CLASS 10 trip, 18.5 kW at 400 V. Current production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"Tripped\"","Depth":"125 mm","Solid":"2x (2.5 ... 16 mm²)","Width":"70 mm","title":"3RU2146-4FB0","Height":"105 mm","at 24 V":"2 A","at 60 V":"0.3 A","Per Pole":"4.5 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 28...40 A Thermal For motor protection Size S3, Class 10 Contactor mounting Main circuit: Screw Auxiliary circuit: Screw Manual-Automatic-Reset","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","During Transport":"-55 ... +80 °C","Fastening Method":"Contactor mounting","For Main Contacts":"M8","Mounting Position":"any","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"thermal overload relay","at 400 V rated value":"18.5 kW","at 480 V rated value":"40 A","at 500 V rated value":"22 kW","at 600 V rated value":"32 A","at 690 V rated value":"37 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":"40 A","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","For Auxiliary And Control Circuit":"screw-type terminals","Between Main And Auxiliary Circuit":"440 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 80 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: 160 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Of The Auxiliary And Control Contacts":"M3","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), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","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","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","operational current at AC-3e at 400 V rated value":"40 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":"13.5 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"28 ... 40 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":"$59.69","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c7a17954d4266bea843dc494de7f9cc4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=630099&mlfb=3RU2146-4FB0"},"ai":{"faq":[{"question":"Where can I buy 3RU2146-4FB0 and how do I get a price?","answer":"The 3RU2146-4FB0 is sourced and quoted to order against an RFQ through our independent distribution channel. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What is 3RU2146-4FB0's listed note (for message \"Tripped\") on this component line?","answer":"The relay carries a functional note \"for message 'Tripped'\" — meaning the integrated auxiliary switch signals only an actual overload trip condition, not a manual test or reset event. This is important for remote monitoring logic that must distinguish a real fault from a maintenance action."},{"question":"Will 3RU2146-4FB0 drop into a panel that was specified around 3RU2116-1FC1 without rewiring?","answer":"No — the 3RU2146-4FB0 is an S3 frame relay, while the 3RU2116-1FC1 is a smaller S0 frame. The S3 has different mounting hole spacing and larger terminal capacity (up to 70 mm² stranded vs. the S0's smaller range). Panel cutouts and wiring will need to be reworked."},{"question":"What compliance documentation does this brand provide for 3RU2146-4FB0?","answer":"The relay carries a RoHS compliance date of 03/01/2017 and is part of the Siemens SIRIUS series, which is CE-marked for the European market. Standard declarations of conformity and RoHS certificates are available from Siemens Industry Online Support."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RU2146-4FB0","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/3RU2146-4FB0 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}}