{"product_id":"siemens-3rh2921-1da11-contacter-auxiliary","title":"Siemens 3RH2921-1DA11 Auxiliary Contact Block","description":"\u003cp data-path-to-node=\"1\"\u003eThe \u003cb data-path-to-node=\"1\" data-index-in-node=\"4\"\u003eSiemens 3RH2921-1DA11\u003c\/b\u003e is a 2-pole, \u003cb data-path-to-node=\"1\" data-index-in-node=\"39\"\u003eside-mounted\u003c\/b\u003e auxiliary contact block from the \u003cb data-path-to-node=\"1\" data-index-in-node=\"85\"\u003eSIRIUS Innovations\u003c\/b\u003e series. In the Canadian elevator industry, this \"1 NO + 1 NC\" side-block is a common alternative to front-mounted auxiliaries. It is specifically used in \u003cb data-path-to-node=\"1\" data-index-in-node=\"258\"\u003eMRL (Machine Room-Less)\u003c\/b\u003e controllers or narrow cabinets where the depth between the contactor and the cabinet door is too shallow for front-mounted accessories.\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 \u003cb data-path-to-node=\"3,1,0\" data-index-in-node=\"10\"\u003eSide-mounted\u003c\/b\u003e (Typically snaps onto the left side of the contactor)\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\"\u003e1 NO + 1 NC\u003c\/b\u003e (One Normally Open, One 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 Fits \u003cb data-path-to-node=\"3,3,0\" data-index-in-node=\"20\"\u003e3RT2\u003c\/b\u003e contactors and \u003cb data-path-to-node=\"3,3,0\" data-index-in-node=\"40\"\u003e3RH2\u003c\/b\u003e relays (Sizes \u003cb data-path-to-node=\"3,3,0\" data-index-in-node=\"59\"\u003eS0 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 (1 NO + 1 NC)\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-path-to-node=\"6\"\u003eDespite having only two poles, this block covers the two most critical operational and safety signals required for a hoist or pump contactor:\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"0\"\u003eThe 1 Normally Open (NO) Contact:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul 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\"\u003eOperational Feedback:\u003c\/b\u003e Typically used as the \"Seal-in\" contact to maintain power to the contactor coil, or to signal the Brake Control Board that the contactor has successfully pulled in.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cb data-path-to-node=\"9\" data-index-in-node=\"0\"\u003eThe 1 Normally Closed (NC) Contact:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul 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 Monitoring (B44 Code):\u003c\/b\u003e This is the \"Mirror Contact\" used for contactor-state feedback. 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 (indicating a \u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"247\"\u003ewelded pole\u003c\/b\u003e), the controller will lock out the car for safety.\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\"\u003eElectrical Interlock:\u003c\/b\u003e Prevents the \"Up\" and \"Down\" contactors from being energized at the same time by wiring the NC contact of one into the coil circuit of the other.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\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; Mechanical Integration\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\"\u003eLateral Profile:\u003c\/b\u003e Mounting this to the side adds approximately \u003cb data-path-to-node=\"13,0,0\" data-index-in-node=\"62\"\u003e10mm to the width\u003c\/b\u003e of the contactor but maintains a slim depth. This is vital for \"wall-hugger\" style controllers where space is at a premium.\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\"\u003eFirst-Position Mount:\u003c\/b\u003e The part number indicates this is a first-position block that mounts directly to the contactor body. On larger frame sizes (S2\/S3), you can often \"stack\" a second-position block onto this one if more contacts are needed later.\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\"\u003eSynchronized Action:\u003c\/b\u003e The block is physically linked to the movement of the main contactor armature, ensuring that the NO\/NC contacts switch precisely when the main power poles do.\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\"\u003eMRL Accessibility:\u003c\/b\u003e In many MRL designs (like \u003cb data-path-to-node=\"16,0,0\" data-index-in-node=\"45\"\u003eKone\u003c\/b\u003e or \u003cb data-path-to-node=\"16,0,0\" data-index-in-node=\"53\"\u003eSchindler\u003c\/b\u003e), components are tightly packed. The side-mount design allows for easier access to the logic wiring without reaching over the high-voltage power leads on the front of the contactor.\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\"\u003eTroubleshooting State Faults:\u003c\/b\u003e If the elevator controller is logging \"Contactor Feedback Errors,\" test the resistance across the NC terminals (usually 51-52 or 61-62). If the resistance is higher than \u003cb data-path-to-node=\"16,1,0\" data-index-in-node=\"200\"\u003e1–2 ohms\u003c\/b\u003e when the contactor is at rest, the internal contacts are likely carbonized and the block should be replaced.\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\"\u003eTerminal Torque:\u003c\/b\u003e Ensure screw terminals are torqued to \u003cb data-path-to-node=\"16,2,0\" data-index-in-node=\"55\"\u003e0.8–1.2 Nm\u003c\/b\u003e. Vibration in the hoistway or machine room can cause these small logic wires to vibrate loose, leading to intermittent safety string drops.\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\"\u003eCompatibility Warning:\u003c\/b\u003e This block is only for \u003cb data-path-to-node=\"16,3,0\" data-index-in-node=\"46\"\u003e3RT2\u003c\/b\u003e (Innovations) series contactors. It will \u003cb data-path-to-node=\"16,3,0\" data-index-in-node=\"92\"\u003enot\u003c\/b\u003e fit the older \u003cb data-path-to-node=\"16,3,0\" data-index-in-node=\"110\"\u003e3RT1\u003c\/b\u003e (Legacy Sirius) units. For older Canadian installations, the equivalent side-mount is the \u003cb data-path-to-node=\"16,3,0\" data-index-in-node=\"205\"\u003e3RH1921-1DA11\u003c\/b\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"R.A.M. Parts","offers":[{"title":"Default Title","offer_id":48120297357464,"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_6b74769d-b612-4783-bdb0-fa2ce5672cfa.jpg?v=1771368495","url":"https:\/\/parts4rem.ca\/products\/siemens-3rh2921-1da11-contacter-auxiliary","provider":"Parts4REM","version":"1.0","type":"link"}