FPS Series

Feeder Protection System

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The FPS Feeder Protection System monitors voltage and current to provide a comprehensive package of 17 protective functions. The FPS is a modular system with integrated protection, breaker control, metering, and data-logging functions.

Operator Interface (FPS-OPI)

  • Large, bright, 4 x 20 vacuum-fluorescent display
  • Display metered values
  • Access set points
  • Powered by Control Unit
  • Panel mount or attach directly to Control Unit
  • Remote mounting (1.2 km or 4000 ft maximum loop length)
  • 1/2 DIN size
  • Hazardous-location certified

Control Unit (FPS-CTU)

  • Current inputs—5-A or 1-A secondary phase current transformers
  • Voltage inputs—up to 600 V without PTs
  • Earth-leakage input—5-A or 1-A secondary or sensitive transformer
  • 8 digital inputs, 5 relay outputs, 1 analog input and output
  • 24-Vdc supply for OPI and RTD modules, and for digital inputs
  • IRIG-B time-code input
  • 1/2 DIN size, surface mount
  • RS-485 network communications (Standard)
  • DeviceNet™, Profibus®, or Ethernet communications available

Features & Benefits

  • Overload

    Long-time overcurrent provides thermal protection for feeder or load

  • Inverse-time overcurrent 

    Coordination using IEEE and IEC Curves

  • Definite-time overcurrent

    Instantaneous overcurrent to detect catastrophic failure

  • Current unbalance/Phase loss/Phase reverse

    Detects an open or high-impedance phase

  • Ground fault

    Inverse and definite time. Early insulation-failure detection

  • RTD temperature

    Optional protection (MPS-RTD module) for load-temperature monitoring

  • Overvoltage

    Limits stress to insulation

  • Undervoltage

    Detects a damaging brown-out condition

  • Voltage unbalance

    Detects unhealthy supply voltage

  • Two setting groups

    Minimizes Arc-Flash hazards during maintenance

  • Breaker control

    Allows local and remote operation; reduces component count

  • Metering

    Displays the measured and calculated parameters

  • Data logging

    On-board 64-event recorder helps with system diagnosis

  • Communications

    Remotely view measured values, event records, & reset trips

  • Conformal coating

    Internal circuits are conformally coated to protect against corrosion and moisture

FPS Datasheet

FPS Manual

FPS DeviceNet Manual


  • Protective Functions (IEEE Device Numbers): Overload (49, 51), Phase reverse (current) (46), Overfrequency (81), Overcurrent (50, 51), Underfrequency (81), Ground fault (50G/N, 51G/N), Unbalance (voltage) (47), RTD temperature (38, 49), Unbalance (current) (46), Phase loss (voltage) (47), Overvoltage (59), Phase loss (current) (46), Undervoltage (27), Phase reverse (voltage) (47), Power factor (55)Input Voltage: 65-265 Vac, 25 VA; 80-275 Vdc, 25 W
  • Power-Up Time: 800 ms at 120 Vac
  • Ride-Through Time: 100 ms minimum
  • 24-VDC Source: 100 mA maximum
  • AC Measurements: True RMS and DFT, Peak, 16 samples/cycle, and positive and negative sequence of fundamental
  • Frequency: 50 or 60 Hz
  • Inputs: Phase current, Earth-leakage current, Phase voltage, 7 digital, 1 analog
  • Output Contacts: 5 contacts — See Product Manual
  • Approvals: CSA certified, C-Tick (Australian)
  • Communications: Allen-Bradley® DFI and Modbus® RTU (Standard); DeviceNet™, Profibus®, Ethernet (Optional)
  • Conformal Coating: Standard feature
  • Warranty: 10 years
  • Mounting: Control Unit: Surface
  • Operator Interface: Panel, Control-Unit mounted

Ordering Information

Ordering NumberCommunications
FPS-CTU-02-00RS-485 & DeviceNet™
FPS-CTU-03-00RS-485 & Profibus®
FPS-CTU-04-00RS-485 & Ethernet

Phase CTsRequired
Ground-Fault CTRecommended


Phase Current Transformers
Phase CTs are required to detect phase currents.

Ground-Fault Current Transformer
Zero-sequence current transformer detects ground-fault current. Available with 5-A and 30-A primary ratings for low-level pickup.

MPS-RTD Temperature Input Module
Optional module provides 8 inputs to connect Pt100, Ni100, Ni120, and Cu10 RTDs.

SE-IP65CVR-M Cover
Optional gasketed, transparent cover for limited access and IP65 protection for an Operator Interface Module.

Featured Case Study

Smart Relay Creates Safety & Efficiency Boom

A large oil & gas exploration company made what is expected to be one of the biggest oil and gas discoveries of the decade in the Permian region’s western part of Texas. The company began evaluating several brands of protection relays to protect their investments in pumps and motors, optimise productivity, and improve safety. After the company’s engineers tried the Littelfuse Bluetooth® Overload Relay MP8000, the search was over.

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Top FAQs

The MP8000 has a wide voltage and current range and operates on 50/60 Hz to protect any motor or pump.

It can also be used to retrofit older current-only based electronic overloads.

It can operate between 90-690VAC and 0.5-1,000A.

Traditional relays require the user to open the electrical cabinets (where relays are typically installed) panel door to use the relay, whether it’s to modify the settings, or to review the cause of a trip event. 

Opening the panel door exposes the worker to shock hazards. Bluetooth, however, enables remote access to these settings, metering and data log information which prevents personnel from unnecessarily having to open the door, thus less exposure to risks.

  • Overload (Overpower) (49)
  • Underload (Underpower) (37P)
  • Overcurrent (51)/Jam
  • Undercurrent (37)
  • Current Unbalance/Phase Loss (46)
  • Phase Reversal (47)
  • Overvoltage (59)
  • Undervoltage (27)
  • Voltage Unbalance (47)
  • Rapid Cycling/Jog
  • Contactor Failure
  • Zero-Sequence Ground Fault (50Ns)
  • PTC Motor Overtemperature (49)

The MP8000 can be used in both single phase and 3 phase applications.

Yes, the MP8000 can be put into current-only mode which will disable voltage-based protection functions. However, Littelfuse strongly recommends utilizing the voltage-based protection functions for superior protection especially prior to motor startup.

The current-only mode is intended for retrofit applications on voltages above 690 VAC.

The MP8000 can be surface or panel mounted, or installed on a DIN rail.

No, the MP8000 uses Bluetooth to connect to your smart phone or tablet via the Littelfuse app, This enhances the users safety as it allows remote access.

Yes, you can access the information remotely through the Littelfuse MP8000 PC software or through other software programs communicating with the MP8000 through the Ethernet interface. Contact Fuseco for information on how to download this software.

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Applicable Industries

Hi Tim, just wanted to thank you and the Fuseco team for your help. You've managed to help us solve some nagging issues here and the Littelfuse SE-330AU relay installation has saved us a lot of time. Thanks!

Mark Sherman

PGS Silver, Queensland

Just wanted to send a note of thanks to you guys. When it comes to relays, your advice & service is high level & appreciated. Cheers.

Jesse Marshall

Newcrest WA

The Littelfuse SE-701 & the CT's are functioning well. Thanks guys, really appreciate your help. Good to work with people you can rely on.

Cliff Peligro

Alpha Coal, Queensland

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