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SECTION 1 4-MicroVersaTrip® Plus and M icro Versa Tri p® PM Trip U nits
Th e MVT -Pius/MVT -PM is a solid-state direct-acting
self-powered trip device system. The system consists of
the MVT -Pius/MVT -PM programmer, current sensors and
a flux shifter trip device. Figure 1 1 0 shows location of
features on programmer. See user manual G EH-589 1 A.
1 4.1 TRI P UNIT
MicroVersaTrip"" Plus Trip Unit
MicroVersaTri p@ Plus trip un its utilize a digital, LCD
display with a four-button keypad to provide local set-up
and readout of trip settings. A 3-phase ammeter and trip
i nd icators are standard, as is a clear plastic cover with
provisions for sealing to allow tamper resistant installa
tion. The trip unit digitally measu res the current waveform
in each phase to determ ine the true RMS value of the
current, regardless of the waveshape. M icroVersaTri p"
Plus trip u nits provide accurate, predictable overload and
short circuit protection for distribution systems that in
clude ac and de variable speed d rives , rectifiers, induction
heatin g , and other loads that cause high harmonic distor
tion as well as standard circuit. They provide maximum
breaker-to-breaker selectivity and custom load protec
tion . Short time and ground fault functions i nclude the
flexibi lity of coordination with or without an l2t ramp and
are also available with high range instantaneous.
MicroVersaTrip® PM Trip U nit
The M icro Versa Trip® PM trip unit adds power manage
ment system capability, advanced metering, and protective
relays to the basic fu nctions of the MicroVersaTrip" Plus.
MicroVersaTrip® P M trip u nits communicate d i rectly on
the GE POWER LEADER'" communications bus.
FIG. 1 1 0
Power Requirements
A small amount of power is necessary to energize the
liquid crystal d is play (LCD) during setup, for viewing
breaker status, and for metering displays. M icro Versa Trip®
PM trip units req uire external 24 Vdc control power for
operation.
The fou r sources of such power are the
following.
•
-
Breaker current sensors provide
Flow of current
sufficient power to energize the LC D when at least
20% of the sensor's am pere rating is flowi ng.
•
2 4 Vdc control power-
P M trip u n its are supplied with external 2 4 Vdc power
that, whenever present, energizes the LC D . Some
breaker models that are configured for MicroVeraTri p
Plus trip u n its may b e optionally equ i pped t o accept
an external 24 Vdc s u pp ly.
•
Micro Versa Trip Test Kit -
Kit, Cat No. TVRMS, contains a 24 Vdc power supply.
The LCD is energized whenever the test kit jack is
p lugged i nto the test receptacle on the rating plug.
•
Micro Versa Trip ba ttery pack -
M icroVersa Trip@ battery pack contains a 24 Vdc power
source and a jack. The LCD is energized when the
jack is plugged i nto the rating plug test receptacle.
Breakers with MicroVersaTrip®
The MicroVersaTripc' Test
T h e p o rt a b l e
77
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