Description
1. Unboxing & Physical Snapshot
- Model & Brand: GE Vernova / General Electric (Multilin Automation Platform) — MIFIIPI55E20HI00 (MIF II Digital Feeder Protection Relay)
- Physical Dimensions: Standard compact enclosure designed for flush panel mounting or standard switchgear rack installation, featuring a front-facing HMI LCD display and indicator LEDs.
- Estimated Shipping Weight: 2.0 kg (4.4 lbs) packed inside industrial anti-static packaging, high-density shock-absorbing foam, and a reinforced export carton.
- What’s in the Box: MIF II relay unit, pluggable terminal blocks, mounting brackets, factory calibration certificate, and quick-start documentation (note: communication cables, auxiliary power supplies, and external CT/VT wiring are ordered separately).
2. Product Introduction
Ensuring reliable power distribution, selective fault clearance, and optimal uptime across industrial and utility electrical networks requires robust digital protection hardware. Operating as an advanced microprocessor-based management device within GE’s Multilin product line, the MIFIIPI55E20HI00 provides comprehensive feeder protection, circuit breaker control, and recloser functionality.
Engineered with phase and ground time-overcurrent (TOC), instantaneous overcurrent (IOC), thermal image protection, event recording, and integrated Modbus communication protocols, the relay delivers precise coordination and asset monitoring. Plant electrical engineers, substation technicians, and system integrators rely on this OEM relay to protect distribution transformers, motors, generators, and primary feeders against overloads and short circuits.
3. Core Technical Specifications
| Parameter | Value |
| Product Series | GE Multilin MIF II (MIF2) Family |
| Model / Part Number | MIFIIPI55E20HI00 |
| Device Type | Digital Feeder Protection and Management Relay |
| Protection Functions | Time-Overcurrent (TOC), Instantaneous Overcurrent (IOC), Thermal Image, Breaker Failure |
| Current Inputs | Standard CT inputs (rated up to 20 A maximum or matching standard secondary configurations) |
| Communication Ports | Front RS232 port, Rear RS485 port supporting Modbus RTU protocol |
| User Interface | 2\times16 character LCD display, programmable navigation buttons, and configurable LED indicators |
| Operating Temperature | -10^\circC to +55^\circC (14^\circF to 131^\circF) ambient typical for protection relays |
| Auxiliary Power Supply | Universal wide-range industrial DC/AC control power options |
4. Global Compliance & Industry Certifications
Digital protection relays deployed in heavy industrial switchgear and electrical substations must meet rigorous international electromagnetic and safety standards.
- Certifications: CE Conformity, cULus Listed Industrial Control Equipment, IEC 60255 compliance for electrical relays, and ISO quality manufacturing standards.
- Safety Relevance: The integrated self-supervision watchdog circuitry and hardware trip-circuit supervision ensure immediate fault isolation and fail-safe operation during internal hardware anomalies.
- Audit Note: Keep relay setting configuration files (.env or EnerVista files), firmware revision logs, and routine trip-test records accessible in your electrical engineering repository to satisfy safety and compliance audits.
5. Long-Term Storage & Asset Preservation Guide
Spare protective relays stored in stockrooms face electronic component aging, electrolytic capacitor wear, and electrostatic risks—requiring precise environmental management.
- Climate Control: Store units in indoor climate-controlled areas where temperatures remain between +10^\circC and +30^\circC and relative humidity stays under 60% non-condensing.
- Moisture Protection: Keep the relay sealed inside its original factory anti-static barrier bag with active desiccant packs until the exact panel cut-out installation window.
- Terminal Maintenance: Protect rear plug-in terminal blocks and communication ports from dust, debris, and corrosion over long storage cycles.
6. Physical Installation Prerequisites
Proper cutout sizing, panel grounding, and secure wiring terminations are critical when installing digital protection relays into switchgear cubicles.
- Panel Cutout: Verify switchgear cutout dimensions to ensure a snug, flush panel mount with secure mechanical retention clamps.
- Grounding Requirements: Connect a dedicated, low-impedance ground wire from the relay’s rear earth-stud directly to the switchgear ground bus to ensure proper electromagnetic compatibility (EMC) and surge protection.
- Wiring Isolation: Always isolate primary CT (Current Transformer) circuits and trip-coil control power before inserting or servicing the unit to prevent high-voltage open-circuit hazards or accidental tripping.
7. Buyer’s FAQ (Logistics & Compliance Focus)
Q: What Harmonized System (HS) Tariff Code applies to this GE Multilin relay for international shipments?
A: Industrial numerical protection relays, electrical automatic control apparatus, and measuring instruments typically classify under HS code 8536.49.0020 or 8538.90.8180. Always verify final classifications with your customs broker.
Q: What software is used to configure and program the MIF II series?
A: The relay is configured, monitored, and maintained using GE’s EnerVista Launchpad software suite via the front RS232 port or rear RS485 Modbus connection.
Q: What is the Country of Origin (COO) for trade compliance record-keeping?
A: GE Grid Solutions automation equipment is manufactured in certified global production facilities, requiring accurate origin documentation on commercial shipping paperwork.
Q: Is specialized shock-resistant packaging required for transit delivery?
A: Yes, because precision internal measurement circuits and display panels are sensitive to severe drop impacts and shock loads during shipping, robust crating and full-value freight insurance are recommended.
