9
40752-195 (1)
Effective 2/2011
response determined by the tsd/tg switch set-
tings of INST, 120ms or 300ms. This switch is
a dual switch that also determines
the ground fault time settings of INST, 120ms
or 300ms. As an example, if the tds/tg switch
is set at a position J, then both short delay time
-
ond example would be to set the tsd/tg switch
The LSIG label (see balloon 8A) should be
used in conjuction with the tsd/tg switch to set
any one of nine possible combinations of short
label should be applied to the right side breaker
trip unit nameplate.
4-9 . For the LSG style, the short delay time is
is set by the tg switch. For the LS style, the
short time is an I2t function.
4-10 . Status LED - A green status light indi-
cates the operational status of the trip unit. If
the load current is approximately 20% of the
maximum current rating (In) of the breaker,
the status light will blink on and off once each
second.
4-11 . Mechanical Push to Trip.
4-12 . The Maintenance Mode and adjustable
INSTantaneous features are only available on
LSI and LSIG styles. Please refer to the label-
ing to the left of the test kit connector. The
Maintenance Mode consists of the two lowest
settings of the INST switch: 2.5x and 4.0x.
For example, a 1200A (In) NG breaker with the
switch set to 2.5x would trip instantaneously
when the current exceeded 3000A.
4-13 . The adjustable INSTantaneous (Ii) Mode
has four settings from 6x to 9x. For example, a
800A (In) NG breaker with the (Ii) switch set to
7x would trip instantaneously with the current
at or above 5600A. The last setting on the (Ii)
switch can be one of three values depending
on the frame current: 800A=28, 1200A=12,
1600A=9.
4-14 . On a
breaker
without Maintenance Mode,
the lowest labeled SDT setting is labeled INS-
Taneous. The lowest SDT setting with Mainte-
nance Mode is labeled as 50ms.
14
12
STATUS
TEST / ALARM
t
g (ms)
t
sd
(ms)
120
K
N
Q
300
L
O
R
*
Inst.
J
M
P
50ms
120
300
Settings
66
46
C0
5
H0
1
E
G
F
H
A
B
D
C
I
R
.8
1.0
.2
.3
.6
.4
I
g (xI
n)
GND
N
P
O
Q
J
K
M
L
R
t
sd/
t
g (ms)
SHORT / GND
*
6
8
7
2
3
5
4
9
I
sd(xI
R
)
SHORT
9
12
20
15
24
2
4
10
7
t
R
(s)
LONG
B
C
D
E
F
G
H
I
J
A
8
12
10
2.5
7
6
I
i(xI
n)
INST
4
Maintenance Mode
Push to Trip
Remote MM
6
6
4
6
C
0
6
H
0
4
STATUS
TEST / ALARM
t
g (ms)
t
sd
(ms)
120
K
N
Q
300
L
O
R
*
Inst.
J
M
P
Inst.
120
300
Settings
6
64
6
C
0
5
H0
1
E
G
F
H
A
B
D
C
I
R
.8
1.0
.2
.3
.6
.4
I
g (xI
n)
GND
N
P
O
Q
J
K
M
L
R
t
sd/
t
g (ms)
SHORT / GND
*
6
8
7
2
3
5
4
9
I
sd(xI
R
)
SHORT
9
12
20
15
24
2
4
10
7
t
R
(s)
LONG
Push to Trip
4P 4d
4P 3dn/2
4P 3d
6
6
4
6
C
0
6
H
0
2
B
C
D
E
F
G
H
A
13
14
