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Masterpact™ MP ci rcu it breaker
control u n its
ST 308S - ST 31 8S
for selective application
1
mechanical pop-out type fault indicator
and reset button
•
indicates that a fault trip has occurred
•
prevents reclosure of the circuit breaker
after fault until reset
2
ammeter
(LED digital display)
3
ammeter selector
used to :
•
read phase currents (1,
2,
3 )
•
read the phase with th e highest load
current (max)
4
sensors rating
5
local (option
F)
or local and
remote (option
J)
fault Indicators:
they consist of built in light emitting diode
:
•
fault indicators differentiate the 3 causes
of tripping :overload, short circuit and
ground fault if any.
•
alarm indicator indicates before the
breaker trips that the long time pickup has
been exceeded.
ground fault (option T) or load
monitoring (option R):
6
ground fault or load monitoring pickups
7
ground fault time delay or load monitoring
pickup
8
long time pickup
9
short time pickup
1 0
short time delay
11
test receptacle
time
long time setting
current
time
current
<D
0.5
to
1
x sensor rating with load nnon�oring option
�
Option T (ground
tau�
protection) and option
R
(load
rnon�oring) cannot
be
combined
®
Residual scheme. The maximum ground tau� pick-up
meets
1984
National Electrical Code paragraph
2�·95(a)
(not exceed
1200A)
@
Total accuracy induding current sensors:±
4,5%
MERLIN GERIN
1
2
3
6
7
a
9
10
11
overcurrent
time
current
4
5
0.4 to 1 x sensor
<D
short time
instantaneous
ST 3088
pickup
(multiple of sensor
ratings)
ST3 18S
ratings (A)
standard
factory set
without
25(}1600
28
12-14·18-21
test
for overcurrent and
fault
fault
2000
21
12-14-18
pickup
MP08
to
MP20
0.2 to 0.6 x sensor rating
delay band
zone selective
MP25
to
MP30
0.2 to 0.4 x sensor rating
MP40 to MP63
fixed at 1200A
0. 1-0.2-0.3-0.4
with option
Z
load
�
inverse time
pickup
alarm
lc1
=
0.8 to 1 x current
lc2
=
0.8 to 1 x current setting
2500
18
12·14
R
time
see time-current curve page 2 7
fault indicators
�00
4000 5000
6m
14
11
11
11
12
6-8
6-8
6-8
not discriminated
built-in ammeter
option
I
control voltage
120 to 240V 50-60Hz
.
7
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