NHP TemBreak PRO, User Manual

Page: 33 / 105

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