{"product_id":"125740-01-bently-nevada-3500-series-relay-module","title":"125740-01 | Bently Nevada | 3500 Series Relay Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBently Nevada 125740-01\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a high-integrity Relay I\/O module within the 3500 Machinery Protection System. This module provides four independent, software-configurable relay channels that trigger alarms or initiate machinery shutdowns based on input from other 3500 series monitors. By translating digital logic states into physical contact closures, the 125740-01 acts as the critical interface between the vibration monitoring rack and the plant's Emergency Shutdown (ESD) or Distributed Control System (DCS). We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New Original\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003estock to ensure the uncompromising safety and response speed required for high-speed turbomachinery.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 125740-01 utilizes a specialized slim-profile design to maximize rack density while providing robust electrical switching:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBently Nevada (Baker Hughes)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e125740-01\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3500 Machinery Protection System\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRelay Module I\/O (Rear Slot)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 (Independently Configurable)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRelay Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eForm C (SPDT - Single Pole Double Throw)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e241 mm x 24 mm x 103 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.4 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-30°C to +65°C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e100% Brand New Original\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile Form C Logic:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eEach channel utilizes a Form C (SPDT) relay, offering both Normally Open (NO) and Normally Closed (NC) contacts. This flexibility allows engineers to design fail-safe circuits tailored to specific plant safety philosophies, such as \"de-energize to trip\" configurations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eZero-Latency Logic Execution:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module receives signals directly via the 3500 rack backplane. This high-speed internal communication path ensures the relay contacts react instantly to alert or danger conditions, providing a crucial defense against rapid mechanical failures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSimplified Rear-Slot Integration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 24 mm slim-width design facilitates easy installation in the rear I\/O section of the 3500 rack. This preserves front-panel space for primary monitoring modules while organizing terminal wiring at the back for cleaner cable management.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eExtreme Environmental Resilience:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 125740-01 maintains precise switching performance across a wide temperature range of -30°C to +65°C. This industrial hardening allows for reliable operation in unheated control rooms or high-heat environments adjacent to steam turbines and gas compressors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRobust Signal Isolation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eInternal circuitry separates the sensitive digital logic from the field-side relay contacts. This isolation protects the monitoring rack from external electrical noise or surges originating from high-voltage control loops.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I configure the relay voting logic for the 125740-01?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYou must utilize the 3500 Rack Configuration Software to map specific monitor channels to these relay outputs. This allows you to set up complex voting logic (e.g., 2-out-of-2) to prevent nuisance trips caused by a single sensor failure.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I replace an existing relay I\/O module while the system is live?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 3500 system supports hot-swapping for most I\/O modules; however, you must first engage the \"Rack Bypass\" or inhibit the specific relay logic in the software. Swapping the 125740-01 without proper software inhibition will likely trigger an immediate machine trip.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat indicates a failure within the relay module itself?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 3500 system monitor continuously performs self-diagnostics. If the 125740-01 fails its internal continuity or logic check, the \"OK\" LED on the front-panel monitor will turn off, and the system will report a configuration or hardware fault to the DCS.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is \"Brand New\" condition mandatory for safety relays?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eElectromechanical relays have a finite lifespan defined by contact wear and coil aging. A\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBrand New Original\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e125740-01 guarantees zero prior switching cycles and fresh components, meeting the strict MTBF (Mean Time Between Failures) standards required for API 670 compliant machinery protection.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":53450778968248,"sku":"125740-01","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/125680-01____1_da091660-5206-481f-9f94-ea8b45f9b316.jpg?v=1778319657","url":"https:\/\/www.globalpetroparts.com\/products\/125740-01-bently-nevada-3500-series-relay-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}