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GE M-PACT - User Manual

GE M-PACT
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‘M-PACT’
Air Circuit Breakers
Operating and Installation Instructions

Table of Contents

Questions and Answers

  • D
    dyerbryanAug 14, 2025
    What to do if my GE Circuit breaker won't close?
    • M
      Melissa FisherAug 14, 2025
      If your GE Circuit breaker won't close, here are a few things to check: * Ensure the breaker is fully in the CONNECTED, TEST, or DISCONNECTED position. If it is not, rack the breaker to one of these positions, remove the racking handle, and then try to close the ACB. * If the M-PRO hasn't been reset, push the orange M-PRO button and try closing the ACB again. * If a UV is fitted but not energized, energize it and then attempt to close the ACB. * If castell or other interlocks are fitted, rotate and remove the interlock key. * Make sure the racking handle is removed before attempting to close the ACB. * If cable interlocks are fitted, check the operational diagram and trip the relevant ACB.
  • L
    laurenpriceAug 17, 2025
    Why does my GE Circuit breaker close and then open immediately?
    • M
      Michael BauerAug 17, 2025
      If your GE Circuit breaker closes and then opens instantaneously, it could be due to the following reasons: * The M-PRO PAMM connector might not be properly inserted. Ensure the PAMM connector is fully inserted into the PAMM module. * The M-PRO protection settings may not be correctly configured. Verify that the protection limits are set appropriately for your system loads and that the inputs are set to normally closed trip without a signal applied. * If you're using a remote Rogowski coil, it might not be fitted correctly. Re-position the coil as illustrated in section 2.
  • C
    catherinereynoldsAug 20, 2025
    How to fix a GE Circuit breaker that won’t rack into the cassette?
    • M
      Mr. Nicholas CaseAug 21, 2025
      If your GE Circuit breaker won’t rack into the cassette, consider the following: * Ensure that the breaker is fully pushed from the maintenance position to the DISCONNECTED position. Push the breaker firmly into the DISCONNECTED position. * The racking drive might not be reset. Reset the racking drive; refer to fig 12.
  • C
    Christine HernandezAug 25, 2025
    What should I do if my GE Circuit breaker will not go into DISCONNECTED position?
    • K
      Karen YuAug 25, 2025
      If your GE Circuit breaker will not go into the DISCONNECTED position: * The mis-insertion stop may be incorrectly set. Reset the mis-insertion device, referring to figs 46 & 47. * The ACB might be incorrect for the given cassette. Verify that the ACB and cassette are the correct pair.
  • S
    Sandra EvansAug 27, 2025
    Why doesn't the earth fault operate below a 40% setting on my GE Circuit breakers?
    • Y
      yperezAug 27, 2025
      For M-PRO 20/30/40: Verify that the APU is fitted and energized. Note that M-PRO 17 does not support settings below 40%. To resolve, fit the APU and energize it; consult section 3 for the wiring diagram.
  • W
    wellsmaureenAug 31, 2025
    Why is the protection unit healthy indicator not working on my GE Circuit breaker?
    • L
      Lisa WoodardAug 31, 2025
      If the protection unit healthy indicator is not working on your GE Circuit breaker: * Check that the APU (if fitted) is energized. If it's not fitted, install the APU. * Insufficient primary current may be the cause. The M-PRO will power with 40% I single phase n & 20% I 3 phase current.
  • M
    Melissa WilsonSep 3, 2025
    Why can't I insert the racking handle into my GE Circuit breaker?
    • S
      Susan MasonSep 3, 2025
      If you cannot insert the racking handle, check for shutter padlocks and remove ALL padlocks.
  • B
    Brittany SchneiderSep 7, 2025
    Why isn't my GE Circuit breaker's M-PRO displaying the existing fault after tripping?
    • D
      darrell32Sep 7, 2025
      If the M-PRO is not displaying the existing fault after the breaker trips, it might be set to auto reset. Although the fault is still stored, you can check the history of trips for the fault type. To prevent this, set the M-PRO reset button to manual.
  • C
    colemanscottSep 10, 2025
    Why are MODBUS communications not responding on my GE Circuit breaker?
    • B
      Benjamin Holmes IISep 10, 2025
      If MODBUS communications are not responding, it could be due to: * Incorrect communication setup. Document LLD11DD003 (available upon request) is required to correctly define the setup. * Incompatible M-PRO baud rate with the host. Set the M-PRO baud rate to match the host.

Summary

Safety Precautions for M-PACT Circuit Breakers

Introduction to M-PACT Circuit Breakers

Guide to site installation, operation, and maintenance by authorized personnel.

Quality Assurance and Standards

Information on design, manufacturing, and ISO 9001 compliance for product quality.

Options Check Sheet

Details of optional features included with each circuit breaker delivery.

Serial Number Identification

Location and importance of the dedicated serial number for communication.

Storage Guidelines

Recommendations for storing circuit breakers in clean, dry environments.

Installing M-PACT Circuit Breakers

Drawout Type Installation

Procedures for positioning and fixing drawout type breakers in switchboards.

Fixed Type Installation

Methods for fastening fixed type circuit breakers to support structures.

Operating M-PACT Circuit Breakers

Instructions for closing and opening the circuit breaker using pushbuttons.

Secondary Circuit Isolation

Description of isolating contacts and their function when breaker is disconnected.

Withdrawal of M-PACT Circuit Breaker

Removal from Cassette

Step-by-step guide for safely removing the breaker from its cassette.

Mounting Circuit Breaker into Cassette

Removing Circuit Breaker Facia

M-PACT Ancillary Equipment Fitting

Motorised Spring Charging Unit Installation

Instructions for fitting the motorised spring charging unit and associated components.

Shunt Trip, Closing Coil, Undervoltage Release

Fitting instructions for shunt trip, closing coil, and undervoltage release units.

Circuit Breaker Security Features

Pushbutton Padlocking

Methods to deny unauthorized access to ON/OFF pushbuttons using padlocks.

Circuit Breaker Security Padlocking

Procedure for locking the breaker in the DISCONNECTED position for security.

Safety Shutters Operation

Description of safety shutters and their operation, including padlocking.

Prop Open Feature for Shutter Inspection

Using the prop open feature to inspect fixed contacts by propping shutters open.

Installing Carriage Switch

Door Interlock and Earthing

Fitting the Door Interlock Mechanism

Instructions for fitting the door interlock mechanism to the cassette.

Busbar and Cable Earthing Procedures

Optional pack for earthing circuit breaker terminals on busbar or cable side.

Anti-trip Plate and Trip Alarm

Fitting the Anti-trip Plate

Procedure for fitting the anti-trip plate to prevent breaker tripping.

Mechanical Trip Alarm Installation

Instructions for fitting the mechanical trip alarm to the circuit breaker.

Mechanical Operations Counter

Fitting instructions for the optional mechanical operations counter.

Breaker Mis-insertion Stop

Description of the 'pin and gate' device preventing incompatible breaker insertion.

Cable Interlock and Routine Inspection

Two-Breaker Cable Interlock

Details for calculating correct cable length for two-breaker interlocks.

Routine Inspection of Fixed or Withdrawable ACB

Annual inspection procedures for arcing contacts, operation, and cassettes.

Maintenance and Troubleshooting Tools

Recommended Tool Kit for Maintenance

List of essential tools for maintenance and modification of M-PACT circuit breakers.

M-PACT Circuit Breaker Troubleshooting

Common problems, possible causes, and solutions for M-PACT circuit breakers.

M-PRO 17 Protection Unit

M-PRO 17 Front Panel Features

Description of the front panel controls, indicators, and display of the M-PRO 17.

Protection Features of M-PRO 17

Long Time Protection Settings

Details on the IEC 947-4 Class 20 curve for long time protection settings.

Short Time Protection Settings

Adjustable short time protection with selectable trip time delay.

Optional Earth Fault Protection

Features and settings for optional earth fault protection.

Making-Current Release; HSISC Protection

Instantaneous trip for faults exceeding making-current capability.

Operator Controls for M-PRO 17

Setting Current (Ir) Adjustment

How to adjust the pickup current for long-time protection.

Short Time Pickup (Im) Adjustment

Setting the pickup current for short time protection.

Short Time Delay Settings

Adjusting the short time delay from instantaneous to 1.0s.

Optional Earth Fault Pickup (If)

Setting the pickup current for optional earth fault protection.

Optional Earth Fault Delay

Setting the fixed-time delay for optional earth fault protection.

Reset Button Operation

Procedure for resetting the M-PRO after a fault trip.

M-PRO 20, 30 & 40 Protection Units

M-PRO 20;30;40 Front Panel Interface

Description of the LCD display, LEDs, keypad, and test port on the front panel.

Menu Structure and Navigation

Navigation Table Overview

Illustrates the menu structure and keypad operation for navigating settings.

M-PRO Menu Structure

PAMM Security Feature

M-PRO Protection Features Overview

Long Time & Short Circuit Curve Settings

Selection of curve type and speed for long time and short circuit protection.

Long Time Pickup Adjustment

Setting the pickup value for long time protection between 40% and 100% In.

Earth Fault Protection Details

Earth Fault Trip Time Delay Settings

Setting the fixed time delay for earth fault protection.

Earth Fault Cropping Factor

Applying a cropping factor to earth fault protection curves.

Earth Fault Inter-trip and Alarm Contacts

Configuration of digital outputs for earth fault inter-tripping and alarms.

Thermal Memory and Digital I;O

Thermal Memory Functionality

User-selectable cooling time constant for thermal content decrement.

M-PRO 30 Output Functions

Description of the four volt-free relay outputs for M-PRO 30.

M-PRO 40 Output Functions

Description of the four volt-free relay outputs for M-PRO 40.

Load Monitoring Features

Indication of overloading and settings for pre-trip warning and load shedding.

Communications Capabilities

Details on RS485 serial link communication using Modbus RTU protocol.

Operating M-PRO 20;30;40

M-PRO Test Box Usage

Test Box Connection and Power

Procedure for connecting and powering the M-PRO test box.

Test Box Re-charging and Calibration

Maintenance and checks for the M-PRO test box charging unit.

Overcurrent and Earth Fault Testing

Performing secondary injection tests for overcurrent and earth fault protection.

Force Trip Testing Procedure

Testing the mechanical operation and reset mechanism via a forced trip.

Neutral Rogowski Coil Mounting

Rogowski Coil Measurement Device Connection

Details on connecting neutral Rogowski coils and Earth Leg CTs.

M-PRO Optional Accessories

Plug-in Portable Power Box

Using a portable power box to energize M-PRO for setting adjustments.

Auxiliary Power Unit

Permanently fitted unit for independent and continuous M-PRO power supply.

Plug-in Portable Test Unit

Permits secondary injection testing of protection features with breaker open or closed.

M-PACT Wiring Diagram and References

M-PACT Wiring Diagram Overview

Schematic showing internal wiring connections for M-PACT circuit breakers.

Terminal References Key

Explanation of terminal references used in the wiring diagrams.

Connections for M-PRO 40

Connections for M-PRO 30

Connections for M-PRO 20

Connections for M-PRO 17

GE M-PACT Specifications

General IconGeneral
BrandGE
ModelM-PACT
CategoryCircuit breakers
LanguageEnglish

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