{"product_id":"ge-489-p5-hi-a20-e-management-relay","title":"GE 489-P5-HI-A20-E Management Relay","description":"\u003cp\u003eThe \u003cstrong\u003eGE Multilin 489-P5-HI-A20-E\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e489-P5-HI-A20-E\u003c\/strong\u003e Generator Management Relay, serves as the primary \u003cstrong\u003e489\u003c\/strong\u003e Generator Management Relay utilized to execute generator protection and monitoring sequences across induction and synchronous generator networks.\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\u003e489-P5-HI-A20-E\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\u003eSeries\u003c\/td\u003e\n\u003ctd\u003e489 Generator Management Relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eCanada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.2 kg (Shipping Weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard 19-inch rack \/ draw-out chassis footprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Input Configuration\u003c\/td\u003e\n\u003ctd\u003e5 A phase CT secondaries (P5 specification)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Control Input\u003c\/td\u003e\n\u003ctd\u003eDC: 90 - 300 V; AC: 70 - 265 V at 48 - 62 Hz (HI option)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Output Subsystem\u003c\/td\u003e\n\u003ctd\u003e4 - 20 mA analog outputs (A20 specification)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Interface Enhancements\u003c\/td\u003e\n\u003ctd\u003eEnhanced display, larger LCD, improved keypad (E option)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePower Protection Matrix and Signal Execution\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Transformer (CT) Interface Scaling\u003c\/strong\u003e The module design incorporates specialized phase sensing circuitry optimized for 5 A current transformer secondary loops. This P5 input hardware layer samples three-phase distribution currents at high resolution, feeding real-time digital signal processing blocks to calculate thermal overload, phase unbalance, and high-set instantaneous overcurrent trip steps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Voltage Auxiliary Power Supply Isolation\u003c\/strong\u003e Operating under the HI specification, the universal power supply stage accepts a wide electrical envelope spanning 90 to 300 VDC or 70 to 265 VAC at line frequencies of 48 to 62 Hz. Internal transformer windings isolate active digital logic components from incoming line transients, maintaining a steady DC voltage rail during sudden plant grid disruptions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog Loop Generation and User Interface Control\u003c\/strong\u003e The hardware incorporates dedicated 4 - 20 mA analog drivers that convert vital generator parameters into active current loops for remote telemetry or SCADA interfaces. Local manipulation is handled via the E-suffixed interface assembly, which utilizes a larger LCD module and a reinforced keypad matrix to modify internal protection settings without a separate terminal PC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How do the P5 5 A CT inputs impact external sensor selection versus 1 A modules?\u003c\/p\u003e\n\u003cp\u003eA: The 489-P5-HI-A20-E requires matching current transformers calibrated for a 5 A secondary output rating at full nominal load. Using 1 A secondary current transformers on this hardware will result in severely underscaled current readings, preventing the relay from detecting true overcurrent or fault conditions.\u003c\/p\u003e\n\u003cp\u003eQ: What protection protocols are available if the local LCD interface loses power or malfunctions?\u003c\/p\u003e\n\u003cp\u003eA: The display and keypad array function independently from the internal protective relay core. If the enhanced display module goes offline, the underlying microprocessors continue to monitor current inputs, process fault logic, and trigger the physical output relays within standard timing parameters.\u003c\/p\u003e","brand":"General Electric","offers":[{"title":"Default Title","offer_id":47618382561470,"sku":"489-P5-HI-A20-E","price":620.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-06-10_10-32-07_d2344ab9-a5f9-4815-9724-4bd400068502.png?v=1781060954","url":"https:\/\/www.autooiltech.com\/products\/ge-489-p5-hi-a20-e-management-relay","provider":"AutoOilTech Limited","version":"1.0","type":"link"}