{"product_id":"siemens-3ru2146-4kb0","title":"Siemens 3RU2146-4KB0 Thermal Overload Relay","description":"\u003cp data-path-to-node=\"1\"\u003eThe \u003cb data-path-to-node=\"1\" data-index-in-node=\"4\"\u003eSiemens 3RU2146-4KB0\u003c\/b\u003e is a size \u003cb data-path-to-node=\"1\" data-index-in-node=\"35\"\u003eS3\u003c\/b\u003e bimetallic thermal overload relay designed for high-capacity motor protection. In the Canadian elevator industry, this range is standard for \u003cb data-path-to-node=\"1\" data-index-in-node=\"179\"\u003eLarge Hydraulic Pump Motors\u003c\/b\u003e and \u003cb data-path-to-node=\"1\" data-index-in-node=\"211\"\u003eHeavy-Duty Traction Machines\u003c\/b\u003e with a Full Load Amperage (FLA) between 57A and 75A. It is engineered to plug directly into the load-side box terminals of an S3 contactor, such as the \u003cb data-path-to-node=\"1\" data-index-in-node=\"392\"\u003e3RT2046 (95A)\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003e\u003cb data-path-to-node=\"2\" data-index-in-node=\"0\"\u003eCore Specifications\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"3\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"3,0,0\"\u003e\u003cb data-path-to-node=\"3,0,0\" data-index-in-node=\"0\"\u003eFrame Size:\u003c\/b\u003e S3 (70mm width)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"3,1,0\"\u003e\u003cb data-path-to-node=\"3,1,0\" data-index-in-node=\"0\"\u003eCurrent Setting Range:\u003c\/b\u003e \u003cb data-path-to-node=\"3,1,0\" data-index-in-node=\"23\"\u003e57.0A to 75.0A\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"3,2,0\"\u003e\u003cb data-path-to-node=\"3,2,0\" data-index-in-node=\"0\"\u003eTrip Class:\u003c\/b\u003e Class 10 (Standard for elevator motor duty)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"3,3,0\"\u003e\u003cb data-path-to-node=\"3,3,0\" data-index-in-node=\"0\"\u003eIntegrated Contacts:\u003c\/b\u003e \u003cb data-path-to-node=\"3,3,0\" data-index-in-node=\"21\"\u003e1 NO + 1 NC\u003c\/b\u003e (Signal\/Logic contacts)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"3,4,0\"\u003e\u003cb data-path-to-node=\"3,4,0\" data-index-in-node=\"0\"\u003eMounting:\u003c\/b\u003e Direct mount to contactor (or standalone via bracket)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"3,5,0\"\u003e\u003cb data-path-to-node=\"3,5,0\" data-index-in-node=\"0\"\u003ePhase Failure Sensitivity:\u003c\/b\u003e Yes (Accelerated tripping if one phase is lost)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"4\"\u003e\n\u003ch3 data-path-to-node=\"5\"\u003e\u003cb data-path-to-node=\"5\" data-index-in-node=\"0\"\u003eIntegrated Auxiliary Contacts\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-path-to-node=\"6\"\u003eThe relay features dedicated terminals for control logic, which are essential for Canadian elevator safety standards:\u003c\/p\u003e\n\u003cul data-path-to-node=\"7\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,0,0\"\u003e\u003cb data-path-to-node=\"7,0,0\" data-index-in-node=\"0\"\u003e95–96 (NC - Normally Closed):\u003c\/b\u003e The \u003cb data-path-to-node=\"7,0,0\" data-index-in-node=\"34\"\u003eSafety\/Trip\u003c\/b\u003e contact. This is wired into the contactor coil circuit or the safety string. If the relay trips, this contact opens and immediately kills power to the motor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,0\"\u003e\u003cb data-path-to-node=\"7,1,0\" data-index-in-node=\"0\"\u003e97–98 (NO - Normally Open):\u003c\/b\u003e The \u003cb data-path-to-node=\"7,1,0\" data-index-in-node=\"32\"\u003eSignal\/Fault\u003c\/b\u003e contact. This closes upon a trip to notify the elevator controller (CPU) of a thermal fault, often triggering a specific error code on the car's diagnostic display.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"8\"\u003e\n\u003ch3 data-path-to-node=\"9\"\u003e\u003cb data-path-to-node=\"9\" data-index-in-node=\"0\"\u003eAuxiliary \u0026amp; Expansion Accessories\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-path-to-node=\"10\"\u003eTo improve serviceability and safety, the following accessories are commonly used:\u003c\/p\u003e\n\u003cp data-path-to-node=\"11\"\u003e\u003cb data-path-to-node=\"11\" data-index-in-node=\"0\"\u003eReset Modules\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"12\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,0,0\"\u003e\u003cb data-path-to-node=\"12,0,0\" data-index-in-node=\"0\"\u003e3RU2900-1AB00:\u003c\/b\u003e \u003cb data-path-to-node=\"12,0,0\" data-index-in-node=\"15\"\u003eElectrical Remote Reset.\u003c\/b\u003e Allows the technician to reset a tripped overload from a button on the controller door or via a software command, preventing the need to access the high-voltage section.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,1,0\"\u003e\u003cb data-path-to-node=\"12,1,0\" data-index-in-node=\"0\"\u003e3RU1900-1A \/ 1B \/ 1C:\u003c\/b\u003e \u003cb data-path-to-node=\"12,1,0\" data-index-in-node=\"22\"\u003eMechanical Remote Reset.\u003c\/b\u003e A flexible cable (up to 1000mm) that allows manual resetting from the exterior of the cabinet.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"13\"\u003e\u003cb data-path-to-node=\"13\" data-index-in-node=\"0\"\u003eMounting \u0026amp; Protection\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"14\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,0,0\"\u003e\u003cb data-path-to-node=\"14,0,0\" data-index-in-node=\"0\"\u003e3RU2946-3AA01:\u003c\/b\u003e \u003cb data-path-to-node=\"14,0,0\" data-index-in-node=\"15\"\u003eIndividual Mount Bracket.\u003c\/b\u003e Required for mounting the overload relay on a DIN rail separate from the contactor.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,1,0\"\u003e\u003cb data-path-to-node=\"14,1,0\" data-index-in-node=\"0\"\u003e3RV2908-0P:\u003c\/b\u003e \u003cb data-path-to-node=\"14,1,0\" data-index-in-node=\"12\"\u003eSealable Cover.\u003c\/b\u003e A clear, lockable cover that prevents unauthorized tampering with the 57A–75A dial after the inspector has approved the settings.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"14,2,0\"\u003e\u003cb data-path-to-node=\"14,2,0\" data-index-in-node=\"0\"\u003e3RT2946-4EA2:\u003c\/b\u003e \u003cb data-path-to-node=\"14,2,0\" data-index-in-node=\"14\"\u003eTerminal Covers.\u003c\/b\u003e Provides finger-safe protection for the large box terminals, reducing the risk of accidental contact with the 480V\/600V feeders.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"15\"\u003e\n\u003ch3 data-path-to-node=\"16\"\u003e\u003cb data-path-to-node=\"16\" data-index-in-node=\"0\"\u003eField Maintenance \u0026amp; Canadian Code Notes\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"17\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,0,0\"\u003e\u003cb data-path-to-node=\"17,0,0\" data-index-in-node=\"0\"\u003eDial Calibration:\u003c\/b\u003e Per Canadian electrical safety codes, the adjustment dial must be set exactly to the \u003cb data-path-to-node=\"17,0,0\" data-index-in-node=\"103\"\u003eMotor Nameplate FLA\u003c\/b\u003e. Never \"crank up\" the setting to bypass nuisance trips; if the relay is tripping at the correct FLA, there is a legitimate mechanical or electrical issue.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,1,0\"\u003e\u003cb data-path-to-node=\"17,1,0\" data-index-in-node=\"0\"\u003eVerification (The Blue Slide):\u003c\/b\u003e During routine maintenance or annual inspections, use the blue \u003cb data-path-to-node=\"17,1,0\" data-index-in-node=\"94\"\u003e\"Test\"\u003c\/b\u003e slide on the face. This manually actuates the 95–96 contact. You must verify that this prevents the elevator from starting a run.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,2,0\"\u003e\u003cb data-path-to-node=\"17,2,0\" data-index-in-node=\"0\"\u003eTerminal Torque:\u003c\/b\u003e This unit carries up to \u003cb data-path-to-node=\"17,2,0\" data-index-in-node=\"41\"\u003e75A\u003c\/b\u003e. In high-vibration elevator rooms, screw terminals can loosen. Ensure the S3 box terminals are torqued to \u003cb data-path-to-node=\"17,2,0\" data-index-in-node=\"151\"\u003e4.5–6.0 Nm\u003c\/b\u003e. Loose leads generate heat that can \"cook\" the relay or cause it to trip prematurely.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,3,0\"\u003e\u003cb data-path-to-node=\"17,3,0\" data-index-in-node=\"0\"\u003eEnvironmental Factors:\u003c\/b\u003e While temperature-compensated to \u003cb data-path-to-node=\"17,3,0\" data-index-in-node=\"56\"\u003e+60°C\u003c\/b\u003e, ensure the machine room or controller cabinet is properly ventilated. In many Canadian penthouse installations, summer heat can significantly shorten the lifespan of bimetallic components.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"R.A.M. Parts","offers":[{"title":"Default Title","offer_id":48128885293208,"sku":null,"price":0.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/4369\/5000\/files\/rn-image_picker_lib_temp_7dd14b9f-c1f0-4d78-956f-cbe20590dc54.jpg?v=1772134605","url":"https:\/\/parts4rem.ca\/products\/siemens-3ru2146-4kb0","provider":"Parts4REM","version":"1.0","type":"link"}