MicroVersaTrip Plus™ and MicroVersaTrip PM™ Trip Units
Chapter 1. Introduction
3
1-3 Trip Unit Functions
MicroVersaTrip Plus and MicroVersaTrip PM Trip
Units have specific standard and optional functions.
All Trip Units share a series of interchangeable
rating plugs. The standard functions for both types
of Trip Unit are as follows:
• Protection
– Long-time protection
– Instantaneous protection
• Status
– Trip target (trip type)
– Trip information (magnitude and phase)
– Trip operations counters
• Metering display
– Phase current (selectable among phases)
The optional functions available on both types of
Trip Unit are as follows:
• High-range (fixed) instantaneous overcurrent
protection
• Short-time protection, with or without I
2
T
• Ground-fault protection, with or without I
2
T
• Defeatable ground fault, with or without I
2
T
• Zone-selective interlock, with ground fault only
or with both ground fault and short time
protection
Additional optional functions available only with
MicroVersaTrip PM Trip Units are as follows:
• Available configurations
– Communication and metering
– Communication and protective relaying
– Communication, metering, and protective
relaying
• Remote communication with POWER
L E A D E R ™ c o m m u n i c a t i o n s n e t w o r k
(commnet)
• Metering functions
– Voltage (V)
– Energy (kWh/MWh/GWh)
– Total real power (kW/MW)
– Total apparent power (kVA/MVA)
– Demand power (kW/MW)
– Peak demand power (kW/MW)
– Frequency (Hz)
• Protective relaying
– Undervoltage
– Overvoltage
– Voltage unbalance
– Current unbalance
– Power reversal
N
N
N
NO
O
O
OT
T
T
TE
E
E
E:::: MicroVersaTrip PM style Trip Units require
ex24 Vdc control power.
N
N
N
NO
O
O
OT
T
T
TE
E
E
E:::: Le déclencheur de type MicroVersaTrip PM
necessite l’utilisation d’une alimentation extérieure
24 Vcc.
1-4 Trip Unit Catalog Numbers
A simple catalog-numbering system defines all of the
standard and optional Trip Unit functions for each
of the two series of Trip Units. Catalog number keys
are found in Appendix 1 for AKR breakers,
Appendix 2 for RMS9C Trip Units in Power Break®
breakers, and in Appendix 3 for RMS9D Trip Units
in Power Break® II breakers. A208LIPMR is an
example of a valid catalog number.
The first character of each catalog number defines
the type of breaker for which it is configured, as
listed in Table 1.
C
C
C
Ch
h
h
haa
a
arrrraa
a
accc
ctttteee
errrr
B
B
B
Brrrreee
eaa
a
akk
k
keee
errrr T
T
T
Tyyyyp
p
p
peee
e
T
T
T
Trrrriiiip
p
p
p U
U
U
Un
n
n
niiiitttt
A
AKR
RMS9C
B
Power Break II
RMS9D
C
Power Break
RMS9C
Table 1. Breaker type referred to by first character of Trip Unit
catalog number.
The second character of the catalog number indi-
cates the highest rated phase current transformer
(CT) sensor allowed for that breaker frame, as listed
in Table 2.
