Introduction
The Undervoltage Release (UVR) accessory, shown in Figure
1, can be installed in 800–4000 ampere frame Power Break®
II circuit breakers. This accessory trips the circuit breaker when
the input control voltage drops to 35–60% of its rated value
and prevents an open breaker from closing until the input
control voltage is greater than 80% of the rated value.
In addition to providing a trip signal to the breaker, the UVR
accessory can be set up to interact with other Power Break II
accessories, when used with a MicroVersaTrip Plus™ or
MicroVersaTrip PM™ Trip Unit. DIP switches on the rear of
the breaker Trip Unit can configure the UVR accessory to
activate a Bell Alarm–Alarm Only accessory or a Bell Alarm
with Lockout accessory when a UVR trip occurs. The Accessory
Configuration section below describes how this can be done. If
the breaker is equipped with a Power+™ Trip Unit, it is
configured so that only protection trips will activate a Bell
Alarm–Alarm Only or Bell Alarm with Lockout.
The catalog numbers for the UVR for various voltage
applications are listed in Table 1.
Figure 1. Undervoltage Release.
Operation
Apply control voltage to terminals 29 and 30 of the ter minal
strip on the right side of the breaker. When the applied control
voltage is above 80% of the UVR’s rated value, the breaker can
be closed. When the voltage drops to 35–60% of the rated
value, the UVR will trip the breaker.
Catalog
Number
Voltage
Rating
❿
Peak Inrush
Current, A
Nominal RMS
Current, mA
SPUV012DC 12 Vdc 19 300
SPUV024DC 24 Vdc 15 140
SPUV048DC 48 Vdc 7.5 70
SPUV125DC 125 Vdc 3 30
SPUV250DC 250 Vdc 1.5 15
SPUV024AC 24 Vac 15 370
SPUV048AC 48 Vac 7.5 210
SPUV120AC 120 Vac 3 80
SPUV208AC 208 Vac 1.9 60
SPUV240AC 240 Vac 1.5 45
❿
24–240 Vac devices are rated for 50/60 Hz.
❡
Peak inrush current is present for 2–6 ms after activation. This
number is provided so that fuses and supplies can be chosen
appropriately.
Table 1. Catalog numbers and voltages for the Undervoltage Release.
Installation
WARNING: Before installing any accessories, turn the breaker
OFF, disconnect it from all voltage sources, and discharge the
charging springs.
AVERTISSEMENT: Avant d’installer toute accessoire, mettre
le disjoncteur en position OFF, le déconnecter de toute tension
d’alimentation, et décharger les ressorts d’armement.
The Undervoltage Release is installed in the accessory
compartment through the front of the circuit breaker in the
position shown in Figure 2.
Figure 2. Accessory compartment on front of circuit breaker, with
Undervoltage Release slot indicated.
Power Break
®
II Circuit Breaker
Accessories
Undervoltage Release
GEH–6285C
U
2
dervoltage
Release
Catalog
No
SPUV
12
QAC
29
—
f
ELEC
30
-
MOO
Hati
Peak
isti
Norn
120
V
AC
50
/
60
HZ
3
A
Made
80
mA
USA
<
8
Remove
beforp
ii
accessory
power
"
Stalling
or
removing
Shunt
Trip
or
Shunt
Trip
with
Lockout
Bell
Alarm
with
Lockout
Bell
Alarm
-
Alarm
Only
Undervoltage
Release
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