{"product_id":"siemens-3ru1146-4jb0-contacter-auxiliary","title":"Siemens 3RU1146-4JB0 Thermal Overload Relay","description":"\u003cp data-path-to-node=\"1\"\u003eThe \u003cb data-path-to-node=\"1\" data-index-in-node=\"4\"\u003eSiemens 3RU1146-4JB0\u003c\/b\u003e is a legacy \u003cb data-path-to-node=\"1\" data-index-in-node=\"37\"\u003eSize S3\u003c\/b\u003e bimetallic thermal overload relay from the original Sirius series. In the Canadian elevator industry, this unit is a mainstay in older controllers, protecting \u003cb data-path-to-node=\"1\" data-index-in-node=\"204\"\u003eLarge Hydraulic Pump Motors\u003c\/b\u003e and \u003cb data-path-to-node=\"1\" data-index-in-node=\"236\"\u003eHeavy-Duty Traction Hoists\u003c\/b\u003e with a Full Load Amperage (FLA) between 45A and 63A. It is designed to plug directly into the load-side box terminals of \u003cb data-path-to-node=\"1\" data-index-in-node=\"384\"\u003e3RT104\u003c\/b\u003e series contactors.\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\"\u003eSeries:\u003c\/b\u003e 3RU11 (Legacy Sirius)\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\"\u003eFrame Size:\u003c\/b\u003e S3 (70mm width)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"3,2,0\"\u003e\u003cb data-path-to-node=\"3,2,0\" data-index-in-node=\"0\"\u003eCurrent Setting Range:\u003c\/b\u003e \u003cb data-path-to-node=\"3,2,0\" data-index-in-node=\"23\"\u003e45.0A to 63.0A\u003c\/b\u003e\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\"\u003eTrip Class:\u003c\/b\u003e Class 10 (Standard for elevator motor protection)\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\"\u003eIntegrated Contacts:\u003c\/b\u003e \u003cb data-path-to-node=\"3,4,0\" data-index-in-node=\"21\"\u003e1 NO + 1 NC\u003c\/b\u003e (Logic\/Signal contacts)\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\"\u003eMounting:\u003c\/b\u003e Direct mount to S3 contactors (or standalone via bracket)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"3,6,0\"\u003e\u003cb data-path-to-node=\"3,6,0\" data-index-in-node=\"0\"\u003ePhase Failure Sensitivity:\u003c\/b\u003e Yes (Accelerated tripping during single-phasing)\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 3RU11 provides the standard dual-contact arrangement required for elevator safety strings and diagnostic monitoring:\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 typically wired in series with the contactor coil or the car's safety string. When an overload is detected, this contact opens, dropping the main contactor to protect the motor windings.\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) that a thermal fault has occurred, allowing the system to log the error and park the car.\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\"\u003eBecause these units are often located in high-voltage sections of the cabinet, accessories are used to allow for safer maintenance:\u003c\/p\u003e\n\u003cp data-path-to-node=\"11\"\u003e\u003cb data-path-to-node=\"11\" data-index-in-node=\"0\"\u003eReset \u0026amp; Control\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\"\u003e3RU1900-1AB00:\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 the fault via a door-mounted pushbutton (standard for 120V Canadian logic).\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:\u003c\/b\u003e \u003cb data-path-to-node=\"12,1,0\" data-index-in-node=\"17\"\u003eMechanical Remote Reset.\u003c\/b\u003e A flexible cable for manual resetting from outside the enclosure.\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\"\u003e3RU1946-3AA01:\u003c\/b\u003e \u003cb data-path-to-node=\"14,0,0\" data-index-in-node=\"15\"\u003eIndividual Mount Bracket.\u003c\/b\u003e Required if you need to mount the overload relay on a DIN rail separately 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\"\u003e3RT1946-4EA2:\u003c\/b\u003e \u003cb data-path-to-node=\"14,1,0\" data-index-in-node=\"14\"\u003eTerminal Covers.\u003c\/b\u003e Provides finger-safe protection for the heavy-duty S3 box terminals.\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\"\u003eModern Replacement:\u003c\/b\u003e The direct functional and dimensional successor is the \u003cb data-path-to-node=\"17,0,0\" data-index-in-node=\"75\"\u003e3RU2146-4JB0\u003c\/b\u003e. If you are replacing a failed 3RU11, the 3RU21 is fully compatible with your existing 3RT1 contactor.\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\"\u003eDial Calibration:\u003c\/b\u003e Per Canadian electrical safety codes, the dial must be set to the \u003cb data-path-to-node=\"17,1,0\" data-index-in-node=\"84\"\u003eMotor Nameplate FLA\u003c\/b\u003e. Do not \"crank up\" the setting to bypass nuisance trips; at 63A, a motor drawing excess current is a significant fire risk and usually indicates mechanical binding or low voltage.\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\"\u003eThe \"Blue Slide\" Test:\u003c\/b\u003e During annual inspections, use the blue \u003cb data-path-to-node=\"17,2,0\" data-index-in-node=\"63\"\u003e\"Test\"\u003c\/b\u003e slide to manually actuate the 95–96 contact. You must verify that this prevents the elevator from starting a run and triggers the correct fault code.\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\"\u003eTerminal Integrity:\u003c\/b\u003e In older S3 controllers, the high current (up to 63A) can cause terminal \"creeping\" over time. Ensure the box terminals are torqued to \u003cb data-path-to-node=\"17,3,0\" data-index-in-node=\"155\"\u003e4.5–6.0 Nm\u003c\/b\u003e. High resistance at these terminals generates heat that will cause the relay to trip prematurely or melt the housing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,4,0\"\u003e\u003cb data-path-to-node=\"17,4,0\" data-index-in-node=\"0\"\u003eBimetallic Aging:\u003c\/b\u003e If the unit is more than 20 years old and trips inconsistently, the internal bimetallic strips may have lost their calibration. In such cases, it is safer to replace the unit with a modern 3RU21.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"R.A.M. Parts","offers":[{"title":"Default Title","offer_id":48128883196056,"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_f9050896-9ec5-4865-98d1-6934de277ba0.jpg?v=1772135738","url":"https:\/\/parts4rem.ca\/products\/siemens-3ru1146-4jb0-contacter-auxiliary","provider":"Parts4REM","version":"1.0","type":"link"}