{"product_id":"ur8mh-ge-multilin-universal-relay-series-datasheet-technical-manual","title":"UR8MH GE Multilin Universal Relay Series Datasheet \u0026 Technical Manual","description":"\u003ch2\u003eGE Multilin UR8MH Universal Relay Series Digital I\/O Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGE Multilin UR8MH\u003c\/strong\u003e serves as the primary \u003cstrong\u003eUR8MH\u003c\/strong\u003e Digital Input\/Output Module utilized to execute specific technical tasks across GE Multilin UR Series platforms. The hardware functions as an addressable logic expansion board that intercepts physical status contacts from primary substation hardware while driving heavy‑duty mechanical trip command paths. The unit routes execution packets back and forth along the shared central rack data bus, translating raw high‑voltage interlock logic conditions and breaker position metrics into internal digital states.\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\u003eUR8MH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGE Multilin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eCanada \/ USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.7 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard UR chassis module size (6 x 4 in) \/ 3.8 x 11.5 x 4.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eDerived internally from the UR chassis backplane supply lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Topology\u003c\/td\u003e\n\u003ctd\u003eMultiple optically isolated inputs and Form-C output relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Rating\u003c\/td\u003e\n\u003ctd\u003eTypical 24 VDC nominal sensing threshold thresholds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Capacity\u003c\/td\u003e\n\u003ctd\u003eForm-C relay outputs rated at 8 A @ 250 VAC \/ 30 VDC resistive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGalvanic Isolation\u003c\/td\u003e\n\u003ctd\u003eComplete optical barrier isolation between I\/O paths and CPU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication Scope\u003c\/td\u003e\n\u003ctd\u003eBreaker automation control, automation interlocking, system alarms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe UR8MH naming matrix defines the exact hardware selection options assigned to this specific digital input\/output expansion interface configuration inside the Universal Relay hierarchy.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUR:\u003c\/strong\u003e Universal Relay Series baseline platform system architecture identifier.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8M:\u003c\/strong\u003e High-density mixed digital input and mechanical relay output card layout assignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eH:\u003c\/strong\u003e Standard processing performance build and component revision parameter level.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProfinet \/ EtherNet\/IP Deterministic Networks and I\/O Density Scaling\u003c\/h3\u003e\n\u003cp\u003eThe UR8MH relies on integrated hardware filtering circuits to optimize local signal processing without compromising baseline backplane bus communication velocity constraints. When expanding regional control loops during extensive I\/O density scaling field upgrades, the processing engine registers status alterations asynchronously, allowing the state data to be parsed for upstream Profinet or EtherNet\/IP deterministic networks via master communication cards. The module enforces strict firmware flash compatibility across legacy and current multi-slot chassis, locking signal delay margins down to deterministic ranges to prevent false interlock tripping profiles.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the UR8MH module be inserted into any open slot location within a Multilin UR Series chassis assembly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA: No.\u003c\/strong\u003e Universal Relay chassis frames feature dedicated slot architectures. Digital I\/O cards such as the UR8MH must lock directly into the specific expansion slots allocated by the master system configuration and memory map. Placing this module in an unassigned or invalid slot will prevent data bus registration and generate a system boot failure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the galvanic isolation on the digital inputs permit mixing different external voltage sources on the same card?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA: Yes, up to the maximum rated isolation threshold.\u003c\/strong\u003e The internal optical isolation pathways physically separate the wet field contact circuits from the central CPU processor. This design prevents common-mode surge voltage migration and permits independent external wetting voltage loops to interface with different groups of isolated input pins on the terminal assembly.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Power Demagnetization:\u003c\/strong\u003e Shut down all auxiliary power lines feeding the primary relay chassis assembly before attempting to service, extract, or insert the 0.7 kg module card framework.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Seating Calibration:\u003c\/strong\u003e Slide the printed circuit board smoothly into the designated slot guide rails. Apply continuous horizontal force until the rear multi-pin male terminal assembly seats completely into the backplane plug-in block, then hand-tighten the integrated front faceplate mounting screws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl Line Cable Routing:\u003c\/strong\u003e Keep external low-voltage digital sensing lines separated from high-voltage AC motor cables inside the wireways to eliminate common-mode noise induction and unintended signal state changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInductive Load Suppression:\u003c\/strong\u003e Install external snubber networks or freewheeling diodes directly across external DC inductive slave relay coils driven by the 8 A Form-C contact outputs to limit contact arcing and prolong contact operating life.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GE Fanuc","offers":[{"title":"Default Title","offer_id":43863101669475,"sku":"UR8MH","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/70_f146f533-f979-4d12-9f64-aee6c5c2092a.jpg?v=1764320099","url":"https:\/\/www.autocontrolglobal.com\/products\/ur8mh-ge-multilin-universal-relay-series-datasheet-technical-manual","provider":"AutoControl Global","version":"1.0","type":"link"}