EATON FP-4000 feeder protection relay

Product basic positioning and core applications

Product attributes: FP-4000 is a microprocessor based medium voltage feeder protection relay launched by Eaton’s Cutler Hammer series. It adopts a fixed housing design and integrates protection, monitoring, control, metering, and data recording functions, aiming to simplify industrial distribution system design, reduce panel space, wiring costs, and equipment inventory.

Core application scenarios:

Main protection: medium voltage feeder, main circuit, contact circuit breaker;

Backup protection: transformers, high-voltage lines, differential protection systems;

Adaptation equipment: medium voltage switchgear, main contact main distribution architecture, Cutler Hammer Digitrip 3000/MV relay coordination system.

Detailed explanation of core protection functions

Specific functional key parameters of protection type

Three phase overcurrent protection with two-stage instantaneous overcurrent (50P-1/2)+inverse time overcurrent (51P-1) instantaneous setting range: 0.1-20.0 times the rated current; Inverse time limit supports 10 standard curves (Mod/Very/Extreme, etc.), with a setting range of 0.1-4.0 times the rated current

Grounding overcurrent protection with two instantaneous (50X/50R-1/2) and inverse time limit (51X/51R) monitoring including measured (Ix) and calculated (IR) grounding currents, with parameters consistent with three-phase overcurrent

Voltage protection main circuit under/over voltage (27M-1/2, 59M-1/2); Auxiliary circuit undervoltage/overvoltage (27A-1/2, 59A-1/2) setting range: 10-150Vac, delay 0-9999 cycles

Frequency protection under frequency (81U-1/2), over frequency (81O-1/2) setting range: 45-65Hz (0.01Hz step), delay 0-9999 cycles

Unbalance protection current imbalance (46-1/2), voltage imbalance (47-1/2), current imbalance threshold: 4-40% I2/I1; Voltage imbalance threshold: 4-40% V2/V1

Characteristic protection circuit breaker fault (50BF), regional interlocking (87B) circuit breaker fault setting: 0.1-5.0 times rated current; Regional interlocking replaces expensive busbar differential protection

Monitoring and metering functions

Full dimensional measurement parameters

Electrical parameters: voltage (rms/phasor/sequence component), current (rms/phasor/sequence component), frequency (± 0.02Hz accuracy), power factor (lag/lead/net);

Power and energy consumption: active/reactive/apparent power (W/VAR/VA), demand/peak demand, kWh/kVARh energy consumption statistics;

Quality parameters: Total Harmonic Distortion (% THD), Phase Angle (± 1 ° accuracy).

Key monitoring functions

Circuit monitoring: continuity of tripping circuit, readiness status of closing circuit, vacuum loss (activated when the circuit breaker is opened);

Abnormal monitoring: residual current detection (over limit alarm), circuit breaker wear (cumulative breaking current statistics);

Self diagnosis: Hardware/firmware automatic self check, triggering relay health alarm in case of malfunction.

Data recording and fault analysis

Record capacity

Fault log: up to 16 events, including voltage/current sampling data, calculated values, and protection function status;

Event sequence: up to 100 event records with timestamps;

Waveform capture: A total of 256 cycles of data, supporting 16 events, can be viewed through PowerNet software.

Data characteristics: All records are stored in non-volatile memory, which is not lost during power outages, making it easy to quickly analyze and restore the system after faults.

Control and programming functions

Basic Control

Operation mode: Front panel switch button (local), communication remote control;

Core logic: Supports master contact master switching scheme and bus transfer logic.

Programming ability

Setting group: up to 4 independent settings, suitable for multi scene switching;

Logic configuration: 6 programmable logic gates (AND/OR/NAND/NOR), 2 latch gates, 6 timers (delay control);

Input/output: 8 discrete inputs (48Vdc wet contacts), 5 sets of A-type output contacts, and 2 sets of C-type output contacts.

Communication and software support

Communication interface and protocol

Interface location, interface type, communication protocol, key parameters

Front RS-232 INCOM baud rate: 38.4k/19.2k/9.6k, 9-pin mini interface

Back RS-485 Modbus RTU baud rate: 19.2k/9.6k, supports long-distance transmission

Back FSK – Auxiliary Communication Expansion

supporting software

PowerPort: Free Windows software that supports local PC connection for parameter configuration, data retrieval, and waveform viewing;

PowerNet: a professional power management software that supports remote monitoring of multiple devices, billing statistics, trend analysis, and graphical display. Please contact an Eaton representative for assistance.

Key electrical and physical specifications

Power supply and input/output specifications

Control voltage: 48-125Vac/dc or 100-240Vac/dc, operating range: 38-300Vdc, 55-264Vac;

Current input: nominal 1A or 5A, CT burden<0.05VA (1A)/<0.25VA (5A), continuous tolerance 2 × In, 1-second tolerance 50 × In;

Voltage input: nominal 120Vac, working range 69-150Vac, burden<0.015VA;

Output contact: Instantaneous 30A ac/dc (0.25 seconds), continuous 5A 120/240Vac or 30Vdc.

Accuracy and environmental specifications

Measurement accuracy: current/voltage ± 0.5%, power ± 1.5%, frequency ± 0.02Hz;

Environmental adaptability: working temperature -40 ℃~+60 ℃ (test tolerance+85 ℃), storage temperature -40 ℃~+85 ℃, humidity 5% -95% (no condensation), altitude 0-2500m;

Clock accuracy: Free running ± 1 minute/month (25 ℃), can be automatically calibrated through PowerNet host.

Physical dimensions: Weight 9 lbs, height 10.15 inches (257.9mm), width 7.62 inches (193.5mm), front panel depth 0.62 inches (15.7mm), back panel depth 7.48 inches (190.0mm).

Compliance certification and selection information

Core certification: UL 1053（1994）、ANSI C37.90（1989）、EN 55011（1991）、FCC 47 CFR Part 15 Class A  Wait.

Selection parameters and catalog number

|Current range | Communication protocol | Control voltage | Style number | Catalog number|

| 5A | INCOM | 48-125Vac/dc | FP4201-00 | 66D2120G41 |

| 1A | INCOM | 48-125Vac/dc | FP4301-00 | 66D2120G42 |

| 5A | INCOM | 100-240Vac/dc | FP4201-10 | 66D2120G44 |

| 1A | INCOM | 100-240Vac/dc | FP4301-10 | 66D2120G45 |

| 5A | Modbus RTU | 100-240Vac/dc | FP4201-11 | 66D2120G46 |

| 1A | Modbus RTU | 100-240Vac/dc | FP4301-11 | 66D2120G47 |

| 5A | Modbus RTU | 48-125Vac/dc | FP4201-01 | 66D2120G48 |

| 1A | Modbus RTU | 48-125Vac/dc | FP4301-01 | 66D2120G49 |