Description Product Introduction The GE 369B1859G0021 is a fully configured Multilin 369 motor protection relay—the one you see in MCC buckets and switchgear rooms handling 4160 V motors on compressors or conveyor drives. This specific build includes 5A phase CT inputs, standard 50/60 Hz operation, and a 120/240 VAC control power supply. No display on this variant, though—it relies on a remote HMI or the front-panel keypad/display if ordered with that option. Unlike the base 369 model, the “B1859G0021” suffix indicates a particular factory configuration with enhanced I/O and communication options. The relay ships with eight RTDs (resistance temperature detectors) built-in—no expansion module required. That’s a big deal if you’re retrofitting a motor with bearing or winding temperature monitoring. In my experience, the 369 series handles thermal capacity modeling better than anything else in its class; it actually learns the motor’s cooling curve over time. The GE 369B1859G0021 just does that without needing external logic. Key Technical Specifications Parameter Specification Model GE 369B1859G0021 Series Multilin 369 CT Inputs 5 A phase CTs (standard) Frequency 50/60 Hz auto-sensing Control Power 120/240 VAC (50/60 Hz) or 125/250 VDC RTD Inputs 8 RTD channels (built-in) Digital I/O 8 digital inputs, 6 relay outputs (configurable) Communication RS485 Modbus RTU (standard) Protection Functions Overload, stall, jam, undercurrent, unbalance, ground fault, thermal overload Accuracy ±2% of reading (typical) Operating Temp -40°C to 60°C Enclosure Drawout case with optional display (not included on this variant) Standards IEC 60255, IEEE C37.90, ANSI C37.90 The GE 369B1859G0021 runs firmware specific to the 369 hardware platform. Firmware updates require the EnerVista 369 software suite and a serial connection via the front RS232 port. Recommended firmware: Version 3.5x or later for full RTD scanning and enhanced event logging. Versions prior to 3.0 had a known issue with CT saturation detection during motor starts—fixed in 3.2. Software compatibility: EnerVista 369 Setup (versions 3.0 through 4.5 work). Do not use 369 Setup v2.x with this relay—the configuration file structure changed. Upgrade procedure: Connect via RS232, open EnerVista, select “Firmware Upgrade” from the device menu. The process takes about 8 minutes. If power drops during the upgrade, the relay bricks. Use a UPS on the control power. Rollback: Not officially supported. If you downgrade from 3.5 to 2.8, the relay may lose RTD mapping. Backup your settings file before any firmware change. ⚠️ Field note: I’ve seen these relays shipped with firmware that doesn’t match the label. Verify the actual firmware version via EnerVista before commissioning. The GE 369B1859G0021 sometimes left the factory with v2.8 even when labeled for v3.0—don’t assume. Original Model Replacement Model Compatibility Level Key Notes GE 369-HI-R-M-F-0-0 GE 369B1859G0021 Drop-in (with configuration) Same hardware platform. The B1859G0021 includes 8 RTDs; the HI variant may have had fewer. Wiring identical if termination boards match. GE 369-LO-R-M-F-0-0 GE 369B1859G0021 Drop-in LO variants used 1A CTs. This unit is 5A. Do not swap unless you change CTs or use an external 1A-to-5A interface. GE 369-Motor Manager II (older) GE 369B1859G0021 Needs adaptation Older units used different CT wiring and I/O pinout. You’ll need a new termination board (369-HI-0-0-0-0-0 style). The relay fits the same cutout, though. GE 469 (feeder relay) GE 369B1859G0021 Incompatible Different application. 469 is for feeder protection, not motor-specific thermal modeling. Third-party generic GE 369B1859G0021 Incompatible No direct substitute. The thermal modeling algorithm is proprietary to GE Multilin. Frequently Asked Questions Q: Does this relay have a built-in display? No. The GE 369B1859G0021 is the displayless version. It includes a front keypad interface and RS232 port for local access, but no LCD. If you need a display, order the version with the “-D” suffix or add a remote display module (GE 369-DISP). Q: Can I use this with 1A CTs? Not directly. The “B1859G0021” suffix indicates 5A CT inputs. If your installation has 1A CTs, you either need a different 369 variant (369-LO-…) or external 1A-to-5A interface transformers. Honestly, the interface transformers are bulky and add failure points—better to source the correct relay. Q: How do I set the motor full-load amps? Use the EnerVista software or the front keypad. Navigate to Setpoints > Motor > Motor FLA. The GE 369B1859G0021 accepts values from 1 to 5000 A (primary). The relay scales automatically based on the CT ratio you configure. Q: What’s the difference between 369B1859G0021 and 369B1859G0022? The G0022 variant typically includes an additional communication module (usually Profibus or DeviceNet). The G0021 is standard RS485 Modbus only. Check the full part number sticker—the last four digits after “G” define the option package. Q: My relay shows “RTD Fault” but the RTDs test fine. Classic 369 issue. The RTD input module has separate ground references. If any RTD is grounded to the motor frame, you’ll get a ground fault alarm. Isolate each RTD leg—the expects fully floating inputs. I’ve spent hours chasing this one. 2711P-K4M3D PLC NXCPU700P 5X00226G02 5PC600.sx02-01 PLC 6SL3120-1TE24-5AA3 PLC A02B-0303-C074 PLC 1336F-BRF20-AE-EN PLC Email: [email protected] Phone: 86 15340683922 Sales:Wu Jiedong Our products are guaranteed for 1 year, with new and original production stopped and imported spare parts. All prices listed on the official website are subject to confirmation by contact: Wu Jiedong (manager). 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