{"product_id":"siemens-3ru2146-4jb0","title":"Siemens 3RU2146-4JB0 Thermal Overload Relay","description":"\u003cp data-path-to-node=\"1\"\u003eThe \u003cb data-path-to-node=\"1\" data-index-in-node=\"4\"\u003eSiemens 3RU2146-4JB0\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-current motor protection. In the Canadian elevator industry, this unit is typically found protecting large \u003cb data-path-to-node=\"1\" data-index-in-node=\"197\"\u003eHydraulic Power Units (HPUs)\u003c\/b\u003e or \u003cb data-path-to-node=\"1\" data-index-in-node=\"229\"\u003eTraction Hoist Motors\u003c\/b\u003e with a Full Load Amperage (FLA) between 45A and 63A. It is engineered to plug directly into the load side of an S3 contactor (like the \u003cb data-path-to-node=\"1\" data-index-in-node=\"386\"\u003e3RT2046\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\"\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=\"3,2,0\"\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\"\u003eMounting:\u003c\/b\u003e Direct mounting to contactor or standalone via bracket\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\"\u003eReset Method:\u003c\/b\u003e Selectable Manual or Automatic reset\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 (Trips faster 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 relay comes with \u003cb data-path-to-node=\"6\" data-index-in-node=\"21\"\u003e1 NO + 1 NC\u003c\/b\u003e integrated signal contacts, which are essential for elevator control logic:\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\"\u003eTerminals 95–96 (NC):\u003c\/b\u003e The \"Trip\" contact. This is wired in series with the contactor coil or the safety string. When an overload is detected, this contact opens, dropping the main contactor to save 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\"\u003eTerminals 97–98 (NO):\u003c\/b\u003e The \"Fault\" contact. This closes upon a trip to signal the elevator controller (CPU) that a motor thermal fault has occurred, often triggering a specific fault code on the 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\"\u003eAccessories \u0026amp; Expansion\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-path-to-node=\"10\"\u003eTo enhance the functionality of the 3RU2146, several snap-on or wired accessories are available:\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\"\u003e3RU2900-1AB00:\u003c\/b\u003e \u003cb data-path-to-node=\"12,0,0\" data-index-in-node=\"15\"\u003eElectrical Remote Reset.\u003c\/b\u003e This allows a technician to reset a tripped overload via a button on the controller door or a remote signal, rather than opening the high-voltage cabinet.\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 (available in lengths from 400mm to 1000mm) that allows 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\"\u003e3RU2946-3AA01:\u003c\/b\u003e \u003cb data-path-to-node=\"14,0,0\" data-index-in-node=\"15\"\u003eStandalone Installation Bracket.\u003c\/b\u003e Essential if you are mounting the overload 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\"\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 plastic cover that can be wire-sealed. This prevents unauthorized tampering with the 45A–63A dial setting once it has been commissioned and inspected.\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 Used to provide finger-safe protection on the heavy-gauge 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\"\u003eDial Calibration:\u003c\/b\u003e Per Canadian electrical standards, the adjustment dial should be set to the \u003cb data-path-to-node=\"17,0,0\" data-index-in-node=\"94\"\u003eMotor Nameplate FLA\u003c\/b\u003e. Do not \"oversize\" the setting to stop nuisance trips; if it is tripping at the nameplate setting, the motor is drawing too much current (possibly due to low voltage or mechanical binding in the pump\/machine).\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\"\u003eTesting the Safety String:\u003c\/b\u003e The blue \"Test\" slide on the front should be used during routine maintenance. Actuating it manually trips the 95–96 contact, allowing the technician to verify that the controller correctly identifies the fault and prevents the car from running.\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\"\u003eTorque Specifications:\u003c\/b\u003e Because this unit handles up to 63A, terminal integrity is critical. Ensure the S3 box terminals are torqued to \u003cb data-path-to-node=\"17,2,0\" data-index-in-node=\"135\"\u003e4.5–6.0 Nm\u003c\/b\u003e. Under-torqued leads will generate heat, which can cause the bimetallic strips inside to \"false trip\" or melt the relay housing.\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\"\u003eAmbient Compensation:\u003c\/b\u003e The relay is compensated for temperatures up to \u003cb data-path-to-node=\"17,3,0\" data-index-in-node=\"70\"\u003e+60°C\u003c\/b\u003e, but in poorly ventilated penthouse machine rooms, heat soak can affect accuracy.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"R.A.M. Parts","offers":[{"title":"Default Title","offer_id":48128886210712,"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_c738a159-5eb0-4c8f-abed-31e0b4b1286b.jpg?v=1771364742","url":"https:\/\/parts4rem.ca\/products\/siemens-3ru2146-4jb0","provider":"Parts4REM","version":"1.0","type":"link"}