{"product_id":"bently-nevada-125720-01-3500-32-machinery-protection-relay","title":"Bently Nevada 125720-01 3500\/32 Machinery Protection Relay","description":"\u003ch2\u003eBently Nevada 125720-01 3500\/32 4-Channel Relay I\/O Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for alarm and machinery shutdown logic execution in Bently Nevada 3500 Series Machinery Protection Systems, the \u003cstrong\u003eBently Nevada 125720-01\u003c\/strong\u003e (\u003cstrong\u003e3500\/32\u003c\/strong\u003e 4-Channel Relay I\/O Module) provides direct physical\/electrical execution. The half-height component maps software-configured alert and danger states from adjacent rack monitors into four independent discrete dry contact outputs. These Form C physical contacts route hardware trip commands directly to emergency shutdown devices or plant control interfaces.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e125720-01\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.4 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e241 mm x 24.4 mm x 99.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-30 to +65 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e5.8 Watts (Maximum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003e4-Channel Relay I\/O Module (Half-height)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e4 Independent Relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelay Type\u003c\/td\u003e\n\u003ctd\u003eSingle-Pole, Double-Throw (SPDT) \/ Form C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Ratings (Resistive)\u003c\/td\u003e\n\u003ctd\u003e5 A @ 24 VDC \/ 120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Switching Voltage\u003c\/td\u003e\n\u003ctd\u003e125 VDC \/ 250 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity\u003c\/td\u003e\n\u003ctd\u003e95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eMachinery Monitoring and TSI Features\u003c\/h3\u003e\n\u003cp\u003eThe module provides discrete execution paths linked directly to backplane rotor dynamics evaluation parameters. When dynamic monitors flags violations based on defined eddy-current probe scaling configurations, the relay logic processes the command within millisecond profiles. The internal circuit architecture applies continuous cross-talk suppression along the backplane traces to safeguard against accidental relay activation caused by transient spikes. This allows operators to configure safe voting logic parameters (such as 2oo4 configurations) relative to real-time gap voltage validation errors or speed measurements across the network.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How is the physical state of the relays determined for fail-safe configurations?\u003c\/p\u003e\n\u003cp\u003eA: Technicians utilize the 3500 Rack Configuration Software to program each channel independently to either a normally energized or normally de-energized state, aligning with the specific plant protection philosophy.\u003c\/p\u003e\n\u003cp\u003eQ: Can this module reside in the front slots of the 3500 chassis alongside monitoring modules?\u003c\/p\u003e\n\u003cp\u003eA: No, the 125720-01 is an I\/O hardware component designed specifically to install into the rear I\/O slots located at the back of the 3500 machinery protection rack.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Retention:\u003c\/strong\u003e Slide the I\/O module into the designated rear slot of the 3500 chassis until the rear connector seats into the backplane. Tighten both thumbscrews to secure structural bonding and ground continuity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShield Terminal Routing:\u003c\/strong\u003e Route all discrete control wiring away from active power transmission paths. Terminate the overall field cable shield at the designated rack ground lug, keeping the machine-side shield ungrounded to prevent ground loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInductive Load Suppression:\u003c\/strong\u003e When driving inductive field devices such as large interposing solenoids or contactors, connect external diode or RC snubber suppression circuits across the load to protect the relay contacts from electrical arcing.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":42870860513370,"sku":"3500\/32M 125720-01","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/417.1.jpg?v=1773020118","url":"https:\/\/www.spareoil.com\/products\/bently-nevada-125720-01-3500-32-machinery-protection-relay","provider":"SpareOil Automation","version":"1.0","type":"link"}