GE M-Pact Plus Manual Download

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M-PACT Plus

State of the Art Electronic Trip Units

• A line offering a new range of electronic trip units designed to extend and/or upgrade the

functionality offered by the existing M-PACT Plus air circuit breaker.

• Two types are available. The simple and effective MPRO-27 and the MPRO-50 offering

extended functionality.

• Each has a LCD screen with ammeter and a menu driven setting interface, allowing a simple

and accurate setting of all parameters.

• This global line of electronic trip units uses the most recent technology to offer each user an

unique combination of selectivity speed and functionality.

Plug'n Play

Electronic trip units are normally supplied factory fitted.
However spares are available that can be simply plugged in
to breakers installed in the ﬁ eld.

(1)

Each trip unit then needs to be adjusted to the required
settings. If the installation is not powered up the installed
battery pack or the seperately available test kit with Power
Pack can be used as alternate power source.

(1) When ordering a spare trip unit the serial number of the

installed breaker is needed for the factory settings

MPRO-27 & MPRO-50

The basic MPRO-27 type has been designed to replace
the existing MPRO-17 and MPRO-18 plus units offering an
extended functionality and a standard ammeter.

The MPRO-50 type replaces the existing MPRO-30 and
MPRO-40 designs covering an extended functionality with
protection devices as fuse links, overload protection and
reduced instantaneous (RELT). Each MPRO-50 comes with a
simple to connect 4 wire modbus communciation option.

Main Adjustment Options

LT-LTD protection

Each device has an overload setting range of 0.4 to a times
In and offer a choice of 22 time bands designed for use with
circuit breakers.
A second set of 22 time bands shaped to match the time
current curves of fuses is available on the MPRO-50 type.

ST-STD protection

A timed delayed short circuit protection is installed with a
current setting of 2 to 12 times the set LT current value. The
short circuit protection time can be set, at one of 17 bands
ranging from 90 milliseconds to 1 second.
Optionaly this device can be set to one of three I

t curves.

I-protection

A switchable and selective instantaneous protection with
a setting range of 2 to 15 times the breaker rating that is
programmed to wait one half cycle until the downstream
device has reacted.

Other protection features

A host of other protection devices is availble including Ground
Fault sum and Ground Fault source return (allowing UEF, SEF
& REF) and a reduced instantaneous device. The reduced
instanataneous device allows the user to conditionally
programme the breaker to trip faster and at lower short
circuit settings than it would on the standard instantaneuos
device.
This RELT device allows the user to reduce the short circuit
current level and its time span, thus reducing the amount of
electrical energy in the direct vicinity of the breaker.