{"product_id":"ge-multilin-345-e-p1-g1-h-e-m-n-n-3e-d-n-multilin-345-series-transformer-protection-relay","title":"GE Multilin 345-E-P1-G1-H-E-M-N-N-3E-D-N Multilin 345 Series Transformer Protection Relay","description":"\u003cp\u003eConfigured for high-speed current transformer signal evaluation in 125 to 250 VDC or 120 to 240 VAC power distribution networks, the \u003cstrong\u003eGE Multilin 345-E-P1-G1-H-E-M-N-N-3E-D-N\u003c\/strong\u003e (\u003cstrong\u003e345\u003c\/strong\u003e Transformer Protection Relay) provides direct physical\/electrical execution. This drawout unit monitors primary and secondary transformer windings, processing protective functions including differential protection (87T), instant and time overcurrent element calculations (50\/51), and thermal replica overload modeling (49P). The hardware architecture routes raw analog input streams from current transformers into solid-state digital processing engines while hosting local English interface elements and serialized rear RS485 communication loops.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eOption Code\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eHardware \/ Software Option Description\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e345\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBase Unit Series Identifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eE\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEnglish User Interface (Standard non-programmable LEDs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eP1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePhase Current Inputs (Specified AC CT Configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eG1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGround Current Inputs (Specified Ground CT Configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eH\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePower Supply (125 to 250 VDC \/ 120 to 240 VAC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eE\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard Hardware Build Revision\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMain Processing Engine \/ Feature Package\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eReserved Option Code\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eReserved Option Code\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3E\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEnhanced Communication Interface Port Variant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eD\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDrawout Case Enclosure Design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard Non-Conformal Coating (No Harsh Environment Option)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eNote: \u003ci\u003eSaved preferences applied — data presented in list format instead of standard tables.\u003c\/i\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel\u003c\/strong\u003e: 345-E-P1-G1-H-E-M-N-N-3E-D-N\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: GE Multilin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin\u003c\/strong\u003e: Canada\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.9 kg (8.6 lbs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions\u003c\/strong\u003e: Standard 345 Drawout Case Architecture (3U\/4U Rack Height Profile)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temp\u003c\/strong\u003e: -40 deg C to +60 deg C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Consumption\u003c\/strong\u003e: 125 to 250 VDC \/ 120 to 240 VAC Nominal Range (15 W typical)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosure Style\u003c\/strong\u003e: Drawout Chassis Design with internal CT Shorting Switches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocal Interface\u003c\/strong\u003e: English Display Front Panel with Fixed Diagnostic Status LEDs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial Protocols\u003c\/strong\u003e: Modbus RTU, DNP 3.0, IEC 60870-5-103 over RS485 \/ Front USB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Functions\u003c\/strong\u003e: 87T, 87T-50, 51P, 51N, 51G, 50P, 50G, 50N, 49P, 46, 86\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity \u0026amp; Network Features\u003c\/h3\u003e\n\u003cp\u003eThe GE Multilin 345 internal processing pipeline handles high-speed analog-to-digital conversions on phase and ground current channels to maintain deterministic trip decision latency. Firmware execution drives backplane bus data exchange across internal I\/O modules with high temporal accuracy, preventing internal bus saturation during high-magnitude fault conditions. Serial communication paths via the front USB and rear RS485 interface support Modbus RTU, DNP 3.0, and IEC 60870-5-103 protocols without altering the core protection engine execution priority. Backplane bus timing routines enforce firmware flash compatibility checks during boot cycles, protecting hardware registers from corrupt parameter uploads.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What safety mechanism prevents open CT circuits when removing the 345 drawout unit?\u003c\/p\u003e\n\u003cp\u003eA: The drawout chassis incorporates automatic internal CT shorting mechanisms. When the inner relay unit is withdrawn from the outer case, the current transformer secondary terminals automatically short-circuit before physical contact pin disengagement occurs.\u003c\/p\u003e\n\u003cp\u003eQ: What are the input voltage tolerances for the 'H' power supply option?\u003c\/p\u003e\n\u003cp\u003eA: The high-voltage power supply accepts continuous operating inputs from 125 to 250 VDC or 120 to 240 VAC at standard 50\/60 Hz frequencies, providing ride-through capability during short-term station supply voltage dips.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eEnsure the drawout case grounding terminal connects directly to the main station earth ground bus using braided copper strap rated for low impedance at high frequencies.\u003c\/li\u003e\n\u003cli\u003eVerify all current transformer secondary circuits maintain correct polarity marking (H1\/X1 alignment) prior to landing wire terminations on the rear screw blocks.\u003c\/li\u003e\n\u003cli\u003eKeep RS485 communication cables segregated from high-voltage AC power wiring and terminate shielded twisted-pair runs with a 120 ohm resistor at each physical end node.\u003c\/li\u003e\n\u003cli\u003eMount the drawout case in vertical cutouts, verifying panel cutout dimensions allow adequate clearance for drawout handle swing and rear cable strain relief.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"GE FANUC","offers":[{"title":"Default Title","offer_id":52687222767928,"sku":"345-E-P1-G1-H-E-M-N-N-3E-D-N","price":220.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0893\/1616\/3896\/files\/345-E-P1-G1-H-E-M-N-N-3E-D-N2.jpg?v=1784882570","url":"https:\/\/www.automodulexpert.com\/products\/ge-multilin-345-e-p1-g1-h-e-m-n-n-3e-d-n-multilin-345-series-transformer-protection-relay","provider":"AutoModuleXpert Ltd.","version":"1.0","type":"link"}