MicroVersaTrip Plus™ and PM™ Trip Units
The Enhanced MicroVersaTrip PlusTM And
MicroVersaTrip PMTM Trip Unit Systems
The Enhanced M icroVersaTrip Plus and M icroVersaTrip PM
trip unit systems for Power Break® I I insulated case breakers
consist of the trip unit, the trip actuator, current sensors and
rating plugs. The term "trip unit system" applies to the combi
nation of these fou r components which form the solid-state
circuit breaker tripping system.
M icroVersaTrip Plus trip units provide a complete range of
standard and optional overcurrent and ground-fault pro
tective functions. M icroVersaTrip PM units add advanced
metering, communications and protective relaying functions.
M icroVersaTrip PM trip units a re designed to function as part
of the G E POWER LEADER™ Power Management System.
Components of M icroVersoTrip Plus trip un it system
True RMS Sensing
Enhanced M icroVersaTrip Plus and MicroVersaTrip PM trip
units continue to use GE's proven technique of measuring
true rms currents (and voltages for M icroVersaTrip PM trip
units) of both sinusoidal and harmonically distorted wave
forms. The frequent sampling (64 times per cycles per phase)
allows precise calculations of true rms current. The sampling
rate allows waveform measurement up to the 3 1st harmonic
to achieve accuracies of 99%. G E's true rms sensing avoids
potential underprotection or overprotection problems associ
ated with peak-sensing tripping systems.
Enhancements to MicroVersaTrip Plus
and MicroVersaTrip PM Trip Units
Enhancements include several new functions that simplify
programming and make fault displays easier to read and
interpret.
14
Batteries
Replaceable, long-life lithium batteries provide programming
and display power to the trip unit's LCD on command. The
trip unit can be removed from the breaker, and all setpomts
can be d efined at a technician's desk. The i ntegral conserva
tion feature extends battery life. The batteries are a utomati
cally shut off when no programming operation or display
req uest is called for within 30 seconds after the last key 1s
pressed. The batteries also enable the user to read fau lt
displays on a n open breaker.
The battery is i ntended to power the Trip Unit when it is
.
otherwise unpowered. At low currents the Trip U nit Display
IS
not active. Pressing the BATTERY key under these conditions
will not activate the display. The MicroVersaTrip Plus trip unit
display is on as long as a small amount of current (mini
mum 20% of current sensor rating) is flowing in the breaker
current sensors. The displays of installed MicroVersaTrip PM
units a re visible at all times due to an ex24Vdc power
supply accessory.
The batteries are not required to maintain programmed
settings, or store trip information. They simply provide a
local power source to energize the programmer when no
othe r source of power is available. All setpoints, time delays
and other programming functions are stored in non-volatile
memory within the trip unit's microprocessor.
Batteries have a two-year life under normal use. They a re
user-replaceable.
LCD
The LCD - liquid crystal display- has increased contrast to
improve legibility in poor lighting conditions. New interna
tional displays symbols are use for various
programming
functions (e.g., "I»" for short circuit and "I>" for overload).
Trip O perations Counter
The enhanced MicroVersaTrip Plus and MicroVersaTrip PM
Trip unit also store and display the total number of trips due
to long time overloads, short time and instantaneous short
circuits, and ground faults. Each display stores u p to 256
operations per trip category before resetting to zero. Each
counter can be ind ividually reset through the keypad.
Accessory Integ ration
Four accessories are integrated through the MicroVersaTrip
Plus a n d M icroVersaTrip PM trip units. Drop-in shunt trip (with
or without lockout). bell alarms (with or without lockout) and
the undervoltage release modules fit into keyed pockets.
They o perate through the trip units, and not through a ny
external mechanism. All accessory wiring is pre-wired to
secondary terminals, and no user wiring is necessary. When
activated, the shunt trip (with our without lockout) and un
dervoltage release modules send a signal to the trip unit to
energize the trip actuator and open the breaker.
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