{"product_id":"siemens-3rh2921-1fa22-contacter-auxiliary","title":"Siemens 3RH2911-1FA22 Auxiliary Contact Block","description":"\u003cp data-path-to-node=\"1\"\u003eThe \u003cb data-path-to-node=\"1\" data-index-in-node=\"4\"\u003eSiemens 3RH2911-1FA22\u003c\/b\u003e is a 4-pole, front-mounted auxiliary contact block part of the \u003cb data-path-to-node=\"1\" data-index-in-node=\"89\"\u003eSIRIUS Innovations\u003c\/b\u003e line. This is arguably the most common auxiliary expansion used in Canadian elevator controllers (such as \u003cb data-path-to-node=\"1\" data-index-in-node=\"214\"\u003eMCE\u003c\/b\u003e, \u003cb data-path-to-node=\"1\" data-index-in-node=\"219\"\u003eGAL Galaxy\u003c\/b\u003e, and \u003cb data-path-to-node=\"1\" data-index-in-node=\"235\"\u003eKone\u003c\/b\u003e). It provides the essential \"2 NO + 2 NC\" configuration required for both operational logic and safety monitoring on a single component.\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 3RH29 (SIRIUS Innovations)\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\"\u003eMounting:\u003c\/b\u003e Front-mounted (Snap-on)\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\"\u003eContact Configuration:\u003c\/b\u003e \u003cb data-path-to-node=\"3,2,0\" data-index-in-node=\"23\"\u003e2 NO + 2 NC\u003c\/b\u003e (Two Normally Open, Two Normally Closed)\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\"\u003eCompatibility:\u003c\/b\u003e Snaps onto \u003cb data-path-to-node=\"3,3,0\" data-index-in-node=\"26\"\u003e3RT2\u003c\/b\u003e contactors or \u003cb data-path-to-node=\"3,3,0\" data-index-in-node=\"45\"\u003e3RH2\u003c\/b\u003e control relays (Sizes \u003cb data-path-to-node=\"3,3,0\" data-index-in-node=\"72\"\u003eS00 to S3\u003c\/b\u003e)\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\"\u003eTerminal Type:\u003c\/b\u003e Screw terminals (Pozi-drive)\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\"\u003eElevator Logic Applications (2 NO + 2 NC)\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-path-to-node=\"6\"\u003eThe \"22\" suffix is the industry standard because it handles the four primary feedback\/control tasks for a motor contactor:\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"0\"\u003eThe 2 Normally Open (NO) Contacts:\u003c\/b\u003e\u003c\/p\u003e\n\u003col start=\"1\" data-path-to-node=\"8\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,0,0\"\u003e\u003cb data-path-to-node=\"8,0,0\" data-index-in-node=\"0\"\u003eSeal-in \/ Holding:\u003c\/b\u003e Keeps the contactor energized after the CPU pulses the start command.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,1,0\"\u003e\u003cb data-path-to-node=\"8,1,0\" data-index-in-node=\"0\"\u003eBrake \/ Logic Signaling:\u003c\/b\u003e Often used to signal the Brake Control Board that the motor contactor is \"Made,\" allowing the brake to lift.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cb data-path-to-node=\"9\" data-index-in-node=\"0\"\u003eThe 2 Normally Closed (NC) Contacts:\u003c\/b\u003e\u003c\/p\u003e\n\u003col start=\"1\" data-path-to-node=\"10\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,0,0\"\u003e\u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"0\"\u003eSafety Feedback (Contactor Monitoring):\u003c\/b\u003e Per Canadian elevator code, the CPU monitors this NC contact when the car is at rest. If the contact remains open while the car is stopped, the CPU assumes a pole has \u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"207\"\u003ewelded\u003c\/b\u003e and locks out the car.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,1,0\"\u003e\u003cb data-path-to-node=\"10,1,0\" data-index-in-node=\"0\"\u003eDirectional Interlocking:\u003c\/b\u003e Used in the \"Up\" contactor circuit to prevent it from pulling in while the \"Down\" contactor is active (and vice-versa).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr data-path-to-node=\"11\"\u003e\n\u003ch3 data-path-to-node=\"12\"\u003e\u003cb data-path-to-node=\"12\" data-index-in-node=\"0\"\u003eInstallation \u0026amp; Safety Features\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"13\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,0,0\"\u003e\u003cb data-path-to-node=\"13,0,0\" data-index-in-node=\"0\"\u003eMirror Contact Certification:\u003c\/b\u003e These are officially rated as \u003cb data-path-to-node=\"13,0,0\" data-index-in-node=\"60\"\u003eMirror Contacts\u003c\/b\u003e. This means that if any of the main power poles of the contactor weld shut, the NC contacts are mechanically prevented from closing, ensuring the safety string cannot \"lie\" to the controller.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,1,0\"\u003e\u003cb data-path-to-node=\"13,1,0\" data-index-in-node=\"0\"\u003eTool-Free Mounting:\u003c\/b\u003e The block snaps into the center slot of the 3RT2 contactor. To remove it for testing or replacement, simply press the release lever at the top of the block.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"13,2,0\"\u003e\u003cb data-path-to-node=\"13,2,0\" data-index-in-node=\"0\"\u003ePositive Driving:\u003c\/b\u003e The auxiliary contacts are physically linked to the main armature of the contactor, ensuring synchronized switching with the power poles.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"14\"\u003e\n\u003ch3 data-path-to-node=\"15\"\u003e\u003cb data-path-to-node=\"15\" data-index-in-node=\"0\"\u003eField Maintenance \u0026amp; Canadian Code Notes\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"16\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,0,0\"\u003e\u003cb data-path-to-node=\"16,0,0\" data-index-in-node=\"0\"\u003eTroubleshooting \"Ghost\" Faults:\u003c\/b\u003e If an elevator is throwing intermittent \"Contactor State Mismatch\" or \"Brake Not Lifting\" errors, the 3RH29 block is often the culprit. Check for carbon buildup on the contact faces; if resistance exceeds \u003cb data-path-to-node=\"16,0,0\" data-index-in-node=\"237\"\u003e1–2 ohms\u003c\/b\u003e when the contact is closed, replace the block.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,1,0\"\u003e\u003cb data-path-to-node=\"16,1,0\" data-index-in-node=\"0\"\u003eTerminal Torque:\u003c\/b\u003e Ensure the logic-level wires (typically 18AWG or 16AWG) are torqued to \u003cb data-path-to-node=\"16,1,0\" data-index-in-node=\"88\"\u003e0.8–1.2 Nm\u003c\/b\u003e. In high-vibration machine rooms, loose terminals here cause intermittent safety string drops.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,2,0\"\u003e\u003cb data-path-to-node=\"16,2,0\" data-index-in-node=\"0\"\u003eInnovations vs. Legacy:\u003c\/b\u003e This block is for \u003cb data-path-to-node=\"16,2,0\" data-index-in-node=\"42\"\u003e3RT2\u003c\/b\u003e series contactors only. If you are servicing an older controller using \u003cb data-path-to-node=\"16,2,0\" data-index-in-node=\"118\"\u003e3RT1\u003c\/b\u003e (Legacy Sirius) contactors, this block will not fit. You must use the \u003cb data-path-to-node=\"16,2,0\" data-index-in-node=\"193\"\u003e3RH1911-1FA22\u003c\/b\u003e instead.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"16,3,0\"\u003e\u003cb data-path-to-node=\"16,3,0\" data-index-in-node=\"0\"\u003eDepth Constraints:\u003c\/b\u003e Because this block adds roughly 38mm to the depth of the contactor, ensure there is enough clearance from the controller cabinet door before closing it, especially in slim-line MRL (Machine Room-Less) controllers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"R.A.M. Parts","offers":[{"title":"Default Title","offer_id":48120297980056,"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_ffd1352b-4c93-4007-8951-3f6a98987069.jpg?v=1771368319","url":"https:\/\/parts4rem.ca\/products\/siemens-3rh2921-1fa22-contacter-auxiliary","provider":"Parts4REM","version":"1.0","type":"link"}