NHP TemBreak PRO - Instantaneous Protection (INST); Adjusting Ii (Current)

Protection Settings
33
TemBreak PRO B_BE-UM-001-EN  V1.1.0
Instantaneous Protection (INST)
Instantaneous protection is designed to protect against high current short circuits. This protection is independent of time and is set as a multiple of I
r
.
Adjusting I
i
(Current)
The l
i
trip threshold tolerance for instantaneous protection is ±20%.
The instantaneous protection has no adjustable time delay.
The non-trip time is 10 ms with a maximum cut-out time is 50 ms
The l
i
can only be adjusted by selecting a pre-defined curve and is set as a multiple of I
r
. Depending on the selected curve and MCCB model there are
maximum values for I
i
based on I
n
.
Instantaneous Threshold
Pre-defined curve number
Rating (I
n
)
1
2
3
4
5
6
7
8
9
10
B250
40 A
14 x I
r
(to a maximum 13 x I
n
)
250 A
300 A
520 A
125 A
650 A
700 A
1625 A
160 A
250 A
800 A
1000 A
3250 A
B400
250 A
14 x I
r
(to a maximum 13 x I
n
)
800 A
1000 A
3250 A
400 A
1280 A
1600 A
5200 A
B800
630 A
14 x I
r
(to a maximum 12 x I
n
)
10 x I
r
14 x I
r
(to a maximum 12 x I
n
)
2.5 x I
r
10 x I
r
12 x I
r
800 A
B1000
1000 A
14 x I
r
(to a maximum 10 x I
n
)
10 x I
r
14 x I
r
(to a maximum 10 x I
n
)
2.5 x I
r
10 x I
r
10 x I
r
B1250
1250 A
14 x I
r
(to a maximum 12 x I
n
)
10 x I
r
14 x I
r
(to a maximum 12 x I
n
)
2.5 x I
r
10 x I
r
12 x I
r
B1600
1600 A
14 x I
r
(to a maximum 12 x I
n
)
10 x I
r
14 x I
r
(to a maximum 12 x I
n
)
2.5 x I
r
10 x I
r
12 x I
r
Instantaneous Delay Settings
Description
I
I
i
(x I
r
)
Instantaneous protection threshold